May 2021 - Linux-kselftest-mirror

[PATCH v5 1/2] selftests/sgx: Rename 'eenter' and 'sgx_call_vdso'

by Jarkko Sakkinen

Rename symbols for better clarity: * 'eenter' might be confused for directly calling ENCLU[EENTER]. It does not. It calls into the VDSO, which actually has the EENTER instruction. * 'sgx_call_vdso' is *only* used for entering the enclave. It's not some generic SGX call into the VDSO. Signed-off-by: Jarkko Sakkinen <jarkko(a)kernel.org> --- v3: Refine the commit message according to Dave's suggestions. v2: Refined the renames just a bit. tools/testing/selftests/sgx/call.S | 6 +++--- tools/testing/selftests/sgx/main.c | 25 +++++++++++++------------ tools/testing/selftests/sgx/main.h | 4 ++-- 3 files changed, 18 insertions(+), 17 deletions(-) diff --git a/tools/testing/selftests/sgx/call.S b/tools/testing/selftests/sgx/call.S index 4ecadc7490f4..b09a25890f3b 100644 --- a/tools/testing/selftests/sgx/call.S +++ b/tools/testing/selftests/sgx/call.S @@ -5,8 +5,8 @@ .text - .global sgx_call_vdso -sgx_call_vdso: + .global sgx_enter_enclave +sgx_enter_enclave: .cfi_startproc push %r15 .cfi_adjust_cfa_offset 8 @@ -27,7 +27,7 @@ sgx_call_vdso: .cfi_adjust_cfa_offset 8 push 0x38(%rsp) .cfi_adjust_cfa_offset 8 - call *eenter(%rip) + call *vdso_sgx_enter_enclave(%rip) add $0x10, %rsp .cfi_adjust_cfa_offset -0x10 pop %rbx diff --git a/tools/testing/selftests/sgx/main.c b/tools/testing/selftests/sgx/main.c index d304a4044eb9..43da68388e25 100644 --- a/tools/testing/selftests/sgx/main.c +++ b/tools/testing/selftests/sgx/main.c @@ -21,7 +21,7 @@ #include "../kselftest.h" static const uint64_t MAGIC = 0x1122334455667788ULL; -vdso_sgx_enter_enclave_t eenter; +vdso_sgx_enter_enclave_t vdso_sgx_enter_enclave; struct vdso_symtab { Elf64_Sym *elf_symtab; @@ -149,7 +149,7 @@ int main(int argc, char *argv[]) { struct sgx_enclave_run run; struct vdso_symtab symtab; - Elf64_Sym *eenter_sym; + Elf64_Sym *sgx_enter_enclave_sym; uint64_t result = 0; struct encl encl; unsigned int i; @@ -194,29 +194,30 @@ int main(int argc, char *argv[]) if (!vdso_get_symtab(addr, &symtab)) goto err; - eenter_sym = vdso_symtab_get(&symtab, "__vdso_sgx_enter_enclave"); - if (!eenter_sym) + sgx_enter_enclave_sym = vdso_symtab_get(&symtab, "__vdso_sgx_enter_enclave"); + if (!sgx_enter_enclave_sym) goto err; - eenter = addr + eenter_sym->st_value; + vdso_sgx_enter_enclave = addr + sgx_enter_enclave_sym->st_value; - ret = sgx_call_vdso((void *)&MAGIC, &result, 0, EENTER, NULL, NULL, &run); - if (!report_results(&run, ret, result, "sgx_call_vdso")) + ret = sgx_enter_enclave((void *)&MAGIC, &result, 0, EENTER, + NULL, NULL, &run); + if (!report_results(&run, ret, result, "sgx_enter_enclave_unclobbered")) goto err; /* Invoke the vDSO directly. */ result = 0; - ret = eenter((unsigned long)&MAGIC, (unsigned long)&result, 0, EENTER, - 0, 0, &run); - if (!report_results(&run, ret, result, "eenter")) + ret = vdso_sgx_enter_enclave((unsigned long)&MAGIC, (unsigned long)&result, + 0, EENTER, 0, 0, &run); + if (!report_results(&run, ret, result, "sgx_enter_enclave")) goto err; /* And with an exit handler. */ run.user_handler = (__u64)user_handler; run.user_data = 0xdeadbeef; - ret = eenter((unsigned long)&MAGIC, (unsigned long)&result, 0, EENTER, - 0, 0, &run); + ret = vdso_sgx_enter_enclave((unsigned long)&MAGIC, (unsigned long)&result, + 0, EENTER, 0, 0, &run); if (!report_results(&run, ret, result, "user_handler")) goto err; diff --git a/tools/testing/selftests/sgx/main.h b/tools/testing/selftests/sgx/main.h index 67211a708f04..68672fd86cf9 100644 --- a/tools/testing/selftests/sgx/main.h +++ b/tools/testing/selftests/sgx/main.h @@ -35,7 +35,7 @@ bool encl_load(const char *path, struct encl *encl); bool encl_measure(struct encl *encl); bool encl_build(struct encl *encl); -int sgx_call_vdso(void *rdi, void *rsi, long rdx, u32 function, void *r8, void *r9, - struct sgx_enclave_run *run); +int sgx_enter_enclave(void *rdi, void *rsi, long rdx, u32 function, void *r8, void *r9, + struct sgx_enclave_run *run); #endif /* MAIN_H */ -- 2.31.1

3 years, 5 months

2
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RE: [PATCH] selftests: net: devlink_port_split.py: skip the test if no devlink device

by Danielle Ratson

> -----Original Message----- > From: Po-Hsu Lin <po-hsu.lin(a)canonical.com> > Sent: Thursday, May 20, 2021 1:50 PM > To: linux-kernel(a)vger.kernel.org; linux-kselftest(a)vger.kernel.org; netdev(a)vger.kernel.org > Cc: po-hsu.lin(a)canonical.com; shuah(a)kernel.org; kuba(a)kernel.org; davem(a)davemloft.net; skhan(a)linuxfoundation.org > Subject: [PATCH] selftests: net: devlink_port_split.py: skip the test if no devlink device > > When there is no devlink device, the following command will return: > $ devlink -j dev show > {dev:{}} > > This will cause IndexError when trying to access the first element in dev of this json dataset. Use the kselftest framework skip code to > skip this test in this case. > > Example output with this change: > # selftests: net: devlink_port_split.py > # no devlink device was found, test skipped > ok 7 selftests: net: devlink_port_split.py # SKIP > > Link: https://bugs.launchpad.net/bugs/1928889 > Signed-off-by: Po-Hsu Lin <po-hsu.lin(a)canonical.com> Reviewed-by: Danielle Ratson <danieller(a)nvidia.com>

3 years, 5 months

1
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[PATCH v8 RESEND 1/4] lib: vsprintf: scanf: Negative number must have field width > 1

by Richard Fitzgerald

If a signed number field starts with a '-' the field width must be > 1, or unlimited, to allow at least one digit after the '-'. This patch adds a check for this. If a signed field starts with '-' and field_width == 1 the scanf will quit. It is ok for a signed number field to have a field width of 1 if it starts with a digit. In that case the single digit can be converted. Signed-off-by: Richard Fitzgerald <rf(a)opensource.cirrus.com> Reviewed-by: Petr Mladek <pmladek(a)suse.com> Acked-by: Andy Shevchenko <andriy.shevchenko(a)linux.intel.com> --- lib/vsprintf.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 41ddc353ebb8..f78651e9b030 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -3466,8 +3466,12 @@ int vsscanf(const char *buf, const char *fmt, va_list args) str = skip_spaces(str); digit = *str; - if (is_sign && digit == '-') + if (is_sign && digit == '-') { + if (field_width == 1) + break; + digit = *(str + 1); + } if (!digit || (base == 16 && !isxdigit(digit)) -- 2.20.1

3 years, 5 months

2
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[PATCH v19 0/8] mm: introduce memfd_secret system call to create "secret" memory areas

by Mike Rapoport

From: Mike Rapoport <rppt(a)linux.ibm.com> Hi, @Andrew, this is based on v5.13-rc1, I can rebase whatever way you prefer. This is an implementation of "secret" mappings backed by a file descriptor. The file descriptor backing secret memory mappings is created using a dedicated memfd_secret system call The desired protection mode for the memory is configured using flags parameter of the system call. The mmap() of the file descriptor created with memfd_secret() will create a "secret" memory mapping. The pages in that mapping will be marked as not present in the direct map and will be present only in the page table of the owning mm. Although normally Linux userspace mappings are protected from other users, such secret mappings are useful for environments where a hostile tenant is trying to trick the kernel into giving them access to other tenants mappings. It's designed to provide the following protections: * Enhanced protection (in conjunction with all the other in-kernel attack prevention systems) against ROP attacks. Seceretmem makes "simple" ROP insufficient to perform exfiltration, which increases the required complexity of the attack. Along with other protections like the kernel stack size limit and address space layout randomization which make finding gadgets is really hard, absence of any in-kernel primitive for accessing secret memory means the one gadget ROP attack can't work. Since the only way to access secret memory is to reconstruct the missing mapping entry, the attacker has to recover the physical page and insert a PTE pointing to it in the kernel and then retrieve the contents. That takes at least three gadgets which is a level of difficulty beyond most standard attacks. * Prevent cross-process secret userspace memory exposures. Once the secret memory is allocated, the user can't accidentally pass it into the kernel to be transmitted somewhere. The secreremem pages cannot be accessed via the direct map and they are disallowed in GUP. * Harden against exploited kernel flaws. In order to access secretmem, a kernel-side attack would need to either walk the page tables and create new ones, or spawn a new privileged uiserspace process to perform secrets exfiltration using ptrace. In the future the secret mappings may be used as a mean to protect guest memory in a virtual machine host. For demonstration of secret memory usage we've created a userspace library https://git.kernel.org/pub/scm/linux/kernel/git/jejb/secret-memory-preloade… that does two things: the first is act as a preloader for openssl to redirect all the OPENSSL_malloc calls to secret memory meaning any secret keys get automatically protected this way and the other thing it does is expose the API to the user who needs it. We anticipate that a lot of the use cases would be like the openssl one: many toolkits that deal with secret keys already have special handling for the memory to try to give them greater protection, so this would simply be pluggable into the toolkits without any need for user application modification. Hiding secret memory mappings behind an anonymous file allows usage of the page cache for tracking pages allocated for the "secret" mappings as well as using address_space_operations for e.g. page migration callbacks. The anonymous file may be also used implicitly, like hugetlb files, to implement mmap(MAP_SECRET) and use the secret memory areas with "native" mm ABIs in the future. Removing of the pages from the direct map may cause its fragmentation on architectures that use large pages to map the physical memory which affects the system performance. However, the original Kconfig text for CONFIG_DIRECT_GBPAGES said that gigabyte pages in the direct map "... can improve the kernel's performance a tiny bit ..." (commit 00d1c5e05736 ("x86: add gbpages switches")) and the recent report [1] showed that "... although 1G mappings are a good default choice, there is no compelling evidence that it must be the only choice". Hence, it is sufficient to have secretmem disabled by default with the ability of a system administrator to enable it at boot time. In addition, there is also a long term goal to improve management of the direct map. [1] https://lore.kernel.org/linux-mm/213b4567-46ce-f116-9cdf-bbd0c884eb3c@linux… v19: * block /dev/mem mmap access, per David * disallow mmap/mprotect with PROT_EXEC, per Kees * simplify return in page_is_secretmem(), per Matthew * use unsigned int for syscall falgs, per Yury v18: https://lore.kernel.org/lkml/20210303162209.8609-1-rppt@kernel.org * rebase on v5.12-rc1 * merge kfence fix into the original patch * massage commit message of the patch introducing the memfd_secret syscall v17: https://lore.kernel.org/lkml/20210208084920.2884-1-rppt@kernel.org * Remove pool of large pages backing secretmem allocations, per Michal Hocko * Add secretmem pages to unevictable LRU, per Michal Hocko * Use GFP_HIGHUSER as secretmem mapping mask, per Michal Hocko * Make secretmem an opt-in feature that is disabled by default v16: https://lore.kernel.org/lkml/20210121122723.3446-1-rppt@kernel.org * Fix memory leak intorduced in v15 * Clean the data left from previous page user before handing the page to the userspace v15: https://lore.kernel.org/lkml/20210120180612.1058-1-rppt@kernel.org * Add riscv/Kconfig update to disable set_memory operations for nommu builds (patch 3) * Update the code around add_to_page_cache() per Matthew's comments (patches 6,7) * Add fixups for build/checkpatch errors discovered by CI systems Older history: v14: https://lore.kernel.org/lkml/20201203062949.5484-1-rppt@kernel.org v13: https://lore.kernel.org/lkml/20201201074559.27742-1-rppt@kernel.org v12: https://lore.kernel.org/lkml/20201125092208.12544-1-rppt@kernel.org v11: https://lore.kernel.org/lkml/20201124092556.12009-1-rppt@kernel.org v10: https://lore.kernel.org/lkml/20201123095432.5860-1-rppt@kernel.org v9: https://lore.kernel.org/lkml/20201117162932.13649-1-rppt@kernel.org v8: https://lore.kernel.org/lkml/20201110151444.20662-1-rppt@kernel.org v7: https://lore.kernel.org/lkml/20201026083752.13267-1-rppt@kernel.org v6: https://lore.kernel.org/lkml/20200924132904.1391-1-rppt@kernel.org v5: https://lore.kernel.org/lkml/20200916073539.3552-1-rppt@kernel.org v4: https://lore.kernel.org/lkml/20200818141554.13945-1-rppt@kernel.org v3: https://lore.kernel.org/lkml/20200804095035.18778-1-rppt@kernel.org v2: https://lore.kernel.org/lkml/20200727162935.31714-1-rppt@kernel.org v1: https://lore.kernel.org/lkml/20200720092435.17469-1-rppt@kernel.org rfc-v2: https://lore.kernel.org/lkml/20200706172051.19465-1-rppt@kernel.org/ rfc-v1: https://lore.kernel.org/lkml/20200130162340.GA14232@rapoport-lnx/ rfc-v0: https://lore.kernel.org/lkml/1572171452-7958-1-git-send-email-rppt@kernel.o… Mike Rapoport (8): mmap: make mlock_future_check() global riscv/Kconfig: make direct map manipulation options depend on MMU set_memory: allow set_direct_map_*_noflush() for multiple pages set_memory: allow querying whether set_direct_map_*() is actually enabled mm: introduce memfd_secret system call to create "secret" memory areas PM: hibernate: disable when there are active secretmem users arch, mm: wire up memfd_secret system call where relevant secretmem: test: add basic selftest for memfd_secret(2) arch/arm64/include/asm/Kbuild | 1 - arch/arm64/include/asm/cacheflush.h | 6 - arch/arm64/include/asm/kfence.h | 2 +- arch/arm64/include/asm/set_memory.h | 17 ++ arch/arm64/include/uapi/asm/unistd.h | 1 + arch/arm64/kernel/machine_kexec.c | 1 + arch/arm64/mm/mmu.c | 6 +- arch/arm64/mm/pageattr.c | 23 +- arch/riscv/Kconfig | 4 +- arch/riscv/include/asm/set_memory.h | 4 +- arch/riscv/include/asm/unistd.h | 1 + arch/riscv/mm/pageattr.c | 8 +- arch/x86/entry/syscalls/syscall_32.tbl | 1 + arch/x86/entry/syscalls/syscall_64.tbl | 1 + arch/x86/include/asm/set_memory.h | 4 +- arch/x86/mm/pat/set_memory.c | 8 +- drivers/char/mem.c | 4 + include/linux/secretmem.h | 54 ++++ include/linux/set_memory.h | 16 +- include/linux/syscalls.h | 1 + include/uapi/asm-generic/unistd.h | 7 +- include/uapi/linux/magic.h | 1 + kernel/power/hibernate.c | 5 +- kernel/power/snapshot.c | 4 +- kernel/sys_ni.c | 2 + mm/Kconfig | 4 + mm/Makefile | 1 + mm/gup.c | 12 + mm/internal.h | 3 + mm/mlock.c | 3 +- mm/mmap.c | 5 +- mm/secretmem.c | 254 +++++++++++++++++++ mm/vmalloc.c | 5 +- scripts/checksyscalls.sh | 4 + tools/testing/selftests/vm/.gitignore | 1 + tools/testing/selftests/vm/Makefile | 3 +- tools/testing/selftests/vm/memfd_secret.c | 296 ++++++++++++++++++++++ tools/testing/selftests/vm/run_vmtests.sh | 17 ++ 38 files changed, 744 insertions(+), 46 deletions(-) create mode 100644 arch/arm64/include/asm/set_memory.h create mode 100644 include/linux/secretmem.h create mode 100644 mm/secretmem.c create mode 100644 tools/testing/selftests/vm/memfd_secret.c base-commit: 6efb943b8616ec53a5e444193dccf1af9ad627b5 -- 2.28.0

3 years, 5 months

6
31
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[PATCH v20 0/7] mm: introduce memfd_secret system call to create "secret" memory areas

by Mike Rapoport

From: Mike Rapoport <rppt(a)linux.ibm.com> Hi, @Andrew, this is based on v5.13-rc1, I can rebase whatever way you prefer. This is an implementation of "secret" mappings backed by a file descriptor. The file descriptor backing secret memory mappings is created using a dedicated memfd_secret system call The desired protection mode for the memory is configured using flags parameter of the system call. The mmap() of the file descriptor created with memfd_secret() will create a "secret" memory mapping. The pages in that mapping will be marked as not present in the direct map and will be present only in the page table of the owning mm. Although normally Linux userspace mappings are protected from other users, such secret mappings are useful for environments where a hostile tenant is trying to trick the kernel into giving them access to other tenants mappings. It's designed to provide the following protections: * Enhanced protection (in conjunction with all the other in-kernel attack prevention systems) against ROP attacks. Seceretmem makes "simple" ROP insufficient to perform exfiltration, which increases the required complexity of the attack. Along with other protections like the kernel stack size limit and address space layout randomization which make finding gadgets is really hard, absence of any in-kernel primitive for accessing secret memory means the one gadget ROP attack can't work. Since the only way to access secret memory is to reconstruct the missing mapping entry, the attacker has to recover the physical page and insert a PTE pointing to it in the kernel and then retrieve the contents. That takes at least three gadgets which is a level of difficulty beyond most standard attacks. * Prevent cross-process secret userspace memory exposures. Once the secret memory is allocated, the user can't accidentally pass it into the kernel to be transmitted somewhere. The secreremem pages cannot be accessed via the direct map and they are disallowed in GUP. * Harden against exploited kernel flaws. In order to access secretmem, a kernel-side attack would need to either walk the page tables and create new ones, or spawn a new privileged uiserspace process to perform secrets exfiltration using ptrace. In the future the secret mappings may be used as a mean to protect guest memory in a virtual machine host. For demonstration of secret memory usage we've created a userspace library https://git.kernel.org/pub/scm/linux/kernel/git/jejb/secret-memory-preloade… that does two things: the first is act as a preloader for openssl to redirect all the OPENSSL_malloc calls to secret memory meaning any secret keys get automatically protected this way and the other thing it does is expose the API to the user who needs it. We anticipate that a lot of the use cases would be like the openssl one: many toolkits that deal with secret keys already have special handling for the memory to try to give them greater protection, so this would simply be pluggable into the toolkits without any need for user application modification. Hiding secret memory mappings behind an anonymous file allows usage of the page cache for tracking pages allocated for the "secret" mappings as well as using address_space_operations for e.g. page migration callbacks. The anonymous file may be also used implicitly, like hugetlb files, to implement mmap(MAP_SECRET) and use the secret memory areas with "native" mm ABIs in the future. Removing of the pages from the direct map may cause its fragmentation on architectures that use large pages to map the physical memory which affects the system performance. However, the original Kconfig text for CONFIG_DIRECT_GBPAGES said that gigabyte pages in the direct map "... can improve the kernel's performance a tiny bit ..." (commit 00d1c5e05736 ("x86: add gbpages switches")) and the recent report [1] showed that "... although 1G mappings are a good default choice, there is no compelling evidence that it must be the only choice". Hence, it is sufficient to have secretmem disabled by default with the ability of a system administrator to enable it at boot time. In addition, there is also a long term goal to improve management of the direct map. [1] https://lore.kernel.org/linux-mm/213b4567-46ce-f116-9cdf-bbd0c884eb3c@linux… v20: * Drop the patch that enable multi-page updates to the direct map, per David * Drop the changes to /dev/mem, they anyway have no effect when CONFIG_STRICT_DEVMEM=y * Add Acked-by and Reviewed-by tags v19: https://lore.kernel.org/lkml/20210513184734.29317-1-rppt@kernel.org * block /dev/mem mmap access, per David * disallow mmap/mprotect with PROT_EXEC, per Kees * simplify return in page_is_secretmem(), per Matthew * use unsigned int for syscall falgs, per Yury v18: https://lore.kernel.org/lkml/20210303162209.8609-1-rppt@kernel.org * rebase on v5.12-rc1 * merge kfence fix into the original patch * massage commit message of the patch introducing the memfd_secret syscall v17: https://lore.kernel.org/lkml/20210208084920.2884-1-rppt@kernel.org * Remove pool of large pages backing secretmem allocations, per Michal Hocko * Add secretmem pages to unevictable LRU, per Michal Hocko * Use GFP_HIGHUSER as secretmem mapping mask, per Michal Hocko * Make secretmem an opt-in feature that is disabled by default v16: https://lore.kernel.org/lkml/20210121122723.3446-1-rppt@kernel.org * Fix memory leak intorduced in v15 * Clean the data left from previous page user before handing the page to the userspace Older history: v15: https://lore.kernel.org/lkml/20210120180612.1058-1-rppt@kernel.org v14: https://lore.kernel.org/lkml/20201203062949.5484-1-rppt@kernel.org v13: https://lore.kernel.org/lkml/20201201074559.27742-1-rppt@kernel.org v12: https://lore.kernel.org/lkml/20201125092208.12544-1-rppt@kernel.org v11: https://lore.kernel.org/lkml/20201124092556.12009-1-rppt@kernel.org v10: https://lore.kernel.org/lkml/20201123095432.5860-1-rppt@kernel.org v9: https://lore.kernel.org/lkml/20201117162932.13649-1-rppt@kernel.org v8: https://lore.kernel.org/lkml/20201110151444.20662-1-rppt@kernel.org v7: https://lore.kernel.org/lkml/20201026083752.13267-1-rppt@kernel.org v6: https://lore.kernel.org/lkml/20200924132904.1391-1-rppt@kernel.org v5: https://lore.kernel.org/lkml/20200916073539.3552-1-rppt@kernel.org v4: https://lore.kernel.org/lkml/20200818141554.13945-1-rppt@kernel.org v3: https://lore.kernel.org/lkml/20200804095035.18778-1-rppt@kernel.org v2: https://lore.kernel.org/lkml/20200727162935.31714-1-rppt@kernel.org v1: https://lore.kernel.org/lkml/20200720092435.17469-1-rppt@kernel.org rfc-v2: https://lore.kernel.org/lkml/20200706172051.19465-1-rppt@kernel.org/ rfc-v1: https://lore.kernel.org/lkml/20200130162340.GA14232@rapoport-lnx/ rfc-v0: https://lore.kernel.org/lkml/1572171452-7958-1-git-send-email-rppt@kernel.o… Mike Rapoport (7): mmap: make mlock_future_check() global riscv/Kconfig: make direct map manipulation options depend on MMU set_memory: allow querying whether set_direct_map_*() is actually enabled mm: introduce memfd_secret system call to create "secret" memory areas PM: hibernate: disable when there are active secretmem users arch, mm: wire up memfd_secret system call where relevant secretmem: test: add basic selftest for memfd_secret(2) arch/arm64/include/asm/Kbuild | 1 - arch/arm64/include/asm/cacheflush.h | 6 - arch/arm64/include/asm/kfence.h | 2 +- arch/arm64/include/asm/set_memory.h | 17 ++ arch/arm64/include/uapi/asm/unistd.h | 1 + arch/arm64/kernel/machine_kexec.c | 1 + arch/arm64/mm/mmu.c | 6 +- arch/arm64/mm/pageattr.c | 13 +- arch/riscv/Kconfig | 4 +- arch/riscv/include/asm/unistd.h | 1 + arch/x86/entry/syscalls/syscall_32.tbl | 1 + arch/x86/entry/syscalls/syscall_64.tbl | 1 + include/linux/secretmem.h | 54 ++++ include/linux/set_memory.h | 12 + include/linux/syscalls.h | 1 + include/uapi/asm-generic/unistd.h | 7 +- include/uapi/linux/magic.h | 1 + kernel/power/hibernate.c | 5 +- kernel/sys_ni.c | 2 + mm/Kconfig | 5 + mm/Makefile | 1 + mm/gup.c | 12 + mm/internal.h | 3 + mm/mlock.c | 3 +- mm/mmap.c | 5 +- mm/secretmem.c | 254 +++++++++++++++++++ scripts/checksyscalls.sh | 4 + tools/testing/selftests/vm/.gitignore | 1 + tools/testing/selftests/vm/Makefile | 3 +- tools/testing/selftests/vm/memfd_secret.c | 296 ++++++++++++++++++++++ tools/testing/selftests/vm/run_vmtests.sh | 17 ++ 31 files changed, 716 insertions(+), 24 deletions(-) create mode 100644 arch/arm64/include/asm/set_memory.h create mode 100644 include/linux/secretmem.h create mode 100644 mm/secretmem.c create mode 100644 tools/testing/selftests/vm/memfd_secret.c base-commit: 6efb943b8616ec53a5e444193dccf1af9ad627b5 -- 2.28.0

3 years, 5 months

2
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[PATCH v5 00/10] userfaultfd: add minor fault handling for shmem

by Axel Rasmussen

Base ==== This series is based on (and therefore should apply cleanly to) the tag "v5.12-rc7-mmots-2021-04-11-20-49", additionally with Peter's selftest cleanup series applied first: https://lore.kernel.org/patchwork/cover/1412450/ Changelog ========= v4->v5: - Picked up {Reviewed,Acked}-by's. - Fix cleanup in error path in shmem_mcopy_atomic_pte(). [Hugh, Peter] - Mention switching to lru_cache_add() in the commit message of 9/10. [Hugh] - Split + reorder commits, so now we 1) implement the faulting path, 2) implement the CONTINUE ioctl, and 3) advertise the feature. Squash the documentation update into step (3). [Hugh, Peter] - Reorder install_pte() cleanup to come before selftest changes. [Hugh] v3->v4: - Fix handling of the shmem private mcopy case. Previously, I had (incorrectly) assumed that !vma_is_anonymous() was equivalent to "the page will be in the page cache". But, in this case we have an optimization where we allocate a new *anonymous* page. So, use a new "bool page_in_cache" instead, which checks if page->mapping is set. Correct several places with this new check. [Hugh] - Fix calling mm_counter() before page_add_..._rmap(). [Hugh] - When modifying shmem_mcopy_atomic_pte() to use the new install_pte() helper, just use lru_cache_add_inactive_or_unevictable(), no need to branch and maybe use lru_cache_add(). [Hugh] - De-pluralize mcopy_atomic_install_pte(s). [Hugh] - Make "writable" a bool, and initialize consistently. [Hugh] v2->v3: - Picked up {Reviewed,Acked}-by's. - Reorder commits: introduce CONTINUE before MINOR registration. [Hugh, Peter] - Don't try to {unlock,put}_page an xarray value in shmem_getpage_gfp. [Hugh] - Move enum mcopy_atomic_mode forward declare out of CONFIG_HUGETLB_PAGE. [Hugh] - Keep mistakenly removed UFFD_USER_MODE_ONLY in selftest. [Peter] - Cleanup context management in self test (make clear implicit, remove unneeded return values now that we have err()). [Peter] - Correct dst_pte argument to dst_pmd in shmem_mcopy_atomic_pte macro. [Hugh] - Mention the new shmem support feature in documentation. [Hugh] v1->v2: - Pick up Reviewed-by's. - Don't swapin page when a minor fault occurs. Notice that it needs to be swapped in, and just immediately fire the minor fault. Let a future CONTINUE deal with swapping in the page. [Peter] - Clarify comment about i_size checks in mm/userfaultfd.c. [Peter] - Only forward declare once (out of #ifdef) in hugetlb.h. [Peter] Changes since [2]: - Squash the fixes ([2]) in with the original series ([1]). This makes reviewing easier, as we no longer have to sift through deltas undoing what we had done before. [Hugh, Peter] - Modify shmem_mcopy_atomic_pte() to use the new mcopy_atomic_install_ptes() helper, reducing code duplication. [Hugh] - Properly trigger handle_userfault() in the shmem_swapin_page() case. [Hugh] - Use shmem_getpage() instead of find_lock_page() to lookup the existing page in for continue. This properly deals with swapped-out pages. [Hugh] - Unconditionally pte_mkdirty() for anon memory (as before). [Peter] - Don't include userfaultfd_k.h in either hugetlb.h or shmem_fs.h. [Hugh] - Add comment for UFFD_FEATURE_MINOR_SHMEM (to match _HUGETLBFS). [Hugh] - Fix some small cleanup issues (parens, reworded conditionals, reduced plumbing of some parameters, simplify labels/gotos, ...). [Hugh, Peter] Overview ======== See the series which added minor faults for hugetlbfs [3] for a detailed overview of minor fault handling in general. This series adds the same support for shmem-backed areas. This series is structured as follows: - Commits 1 and 2 are cleanups. - Commits 3 and 4 implement the new feature (minor fault handling for shmem). - Commit 5 advertises that the feature is now available since at this point it's fully implemented. - Commit 6 is a final cleanup, modifying an existing code path to re-use a new helper we've introduced. - Commits 7, 8, 9, 10 update the userfaultfd selftest to exercise the feature. Use Case ======== In some cases it is useful to have VM memory backed by tmpfs instead of hugetlbfs. So, this feature will be used to support the same VM live migration use case described in my original series. Additionally, Android folks (Lokesh Gidra <lokeshgidra(a)google.com>) hope to optimize the Android Runtime garbage collector using this feature: "The plan is to use userfaultfd for concurrently compacting the heap. With this feature, the heap can be shared-mapped at another location where the GC-thread(s) could continue the compaction operation without the need to invoke userfault ioctl(UFFDIO_COPY) each time. OTOH, if and when Java threads get faults on the heap, UFFDIO_CONTINUE can be used to resume execution. Furthermore, this feature enables updating references in the 'non-moving' portion of the heap efficiently. Without this feature, uneccessary page copying (ioctl(UFFDIO_COPY)) would be required." [1] https://lore.kernel.org/patchwork/cover/1388144/ [2] https://lore.kernel.org/patchwork/patch/1408161/ [3] https://lore.kernel.org/linux-fsdevel/20210301222728.176417-1-axelrasmussen… Axel Rasmussen (10): userfaultfd/hugetlbfs: avoid including userfaultfd_k.h in hugetlb.h userfaultfd/shmem: combine shmem_{mcopy_atomic,mfill_zeropage}_pte userfaultfd/shmem: support minor fault registration for shmem userfaultfd/shmem: support UFFDIO_CONTINUE for shmem userfaultfd/shmem: advertise shmem minor fault support userfaultfd/shmem: modify shmem_mcopy_atomic_pte to use install_pte() userfaultfd/selftests: use memfd_create for shmem test type userfaultfd/selftests: create alias mappings in the shmem test userfaultfd/selftests: reinitialize test context in each test userfaultfd/selftests: exercise minor fault handling shmem support Documentation/admin-guide/mm/userfaultfd.rst | 3 +- fs/userfaultfd.c | 6 +- include/linux/hugetlb.h | 4 +- include/linux/shmem_fs.h | 17 +- include/linux/userfaultfd_k.h | 5 + include/uapi/linux/userfaultfd.h | 7 +- mm/hugetlb.c | 1 + mm/memory.c | 8 +- mm/shmem.c | 110 +++----- mm/userfaultfd.c | 175 ++++++++---- tools/testing/selftests/vm/userfaultfd.c | 274 ++++++++++++------- 11 files changed, 360 insertions(+), 250 deletions(-) -- 2.31.1.498.g6c1eba8ee3d-goog

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[PATCH v2] lib/test: convert test_overflow.c to use KUnit

by Daniel Latypov

This largely consists of: * replacing `err |= test_func(...)` calls with `test_func(test, ...)`. * changing pr_warn to KUNIT_*_MSG() macros to mark the failed test while printing a diagnostic message * dropping __init as there are concerns of this causing issues w/ KUnit when running on some other arches. With the exception of now needing to set CONFIG_KUNIT=y, the test can still be run as before, at boot time or as a test module. But now the output of the test will be TAP (Test Anything Protocol), the format used by kselftest instead of just warnings and printing "FAIL!" , see [1]. But now the test can also be run more quickly via kunit.py $ ./tools/testing/kunit/kunit.py run --kunitconfig /dev/stdin <<EOF CONFIG_KUNIT=y CONFIG_TEST_OVERFLOW=y EOF Note: after a mrproper this took > Elapsed time: 38.683s total, 3.598s configuring, 32.141s building, 0.000s running (Normally would be less clunky as you wouldn't use a heredoc). [1] Here's an example failure message after tweaking the test array: TAP version 14 1..1 # Subtest: lib_overflow 1..10 # test_u8_overflow: u8 : 18 arithmetic tests # test_u8_overflow: EXPECTATION FAILED at lib/test_overflow.c:251 Expected _got == p->sum, but _got == 0 p->sum == 1 wrong result for 0 + 0 (type u8) ... not ok 1 - test_u8_overflow # test_s8_overflow: s8 : 19 arithmetic tests ok 2 - test_s8_overflow ... # test_overflow_shift: ok: (s32)(0 << 31) == 0 # test_overflow_shift: ok: (s64)(0 << 63) == 0 ok 9 - test_overflow_shift Signed-off-by: Daniel Latypov <dlatypov(a)google.com> Tested-by: David Gow <davidgow(a)google.com> -- v1 -> v2: * Use kunit_info() instead of pr_info(). * means messages are printed prefixed with "# test_name: " * Add in missing conversion to KUNIT_EXPECT_* macros --- lib/Kconfig.debug | 4 +- lib/test_overflow.c | 433 ++++++++++++++++++++------------------------ 2 files changed, 196 insertions(+), 241 deletions(-) diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 678c13967580..8e19ba9ac22c 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -2195,7 +2195,9 @@ config TEST_XARRAY tristate "Test the XArray code at runtime" config TEST_OVERFLOW - tristate "Test check_*_overflow() functions at runtime" + tristate "Test check_*_overflow() functions at runtime" if !KUNIT_ALL_TESTS + depends on KUNIT + default KUNIT_ALL_TESTS config TEST_RHASHTABLE tristate "Perform selftest on resizable hash table" diff --git a/lib/test_overflow.c b/lib/test_overflow.c index 7a4b6f6c5473..098339251908 100644 --- a/lib/test_overflow.c +++ b/lib/test_overflow.c @@ -2,10 +2,9 @@ /* * Test cases for arithmetic overflow checks. */ -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <kunit/test.h> #include <linux/device.h> -#include <linux/init.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/module.h> @@ -19,7 +18,7 @@ t a, b; \ t sum, diff, prod; \ bool s_of, d_of, p_of; \ - } t ## _tests[] __initconst + } t ## _tests[] DEFINE_TEST_ARRAY(u8) = { {0, 0, 0, 0, 0, false, false, false}, @@ -215,48 +214,38 @@ DEFINE_TEST_ARRAY(s64) = { {0, -S64_MAX, -S64_MAX, S64_MAX, 0, false, false, false}, }; -#define check_one_op(t, fmt, op, sym, a, b, r, of) do { \ - t _r; \ - bool _of; \ - \ - _of = check_ ## op ## _overflow(a, b, &_r); \ - if (_of != of) { \ - pr_warn("expected "fmt" "sym" "fmt \ - " to%s overflow (type %s)\n", \ - a, b, of ? "" : " not", #t); \ - err = 1; \ - } \ - if (_r != r) { \ - pr_warn("expected "fmt" "sym" "fmt" == " \ - fmt", got "fmt" (type %s)\n", \ - a, b, r, _r, #t); \ - err = 1; \ - } \ +#define check_one_op(t, fmt, op, sym, a, b, want, of) do { \ + t _got; \ + bool _of; \ + \ + _of = check_ ## op ## _overflow(a, b, &_got); \ + KUNIT_EXPECT_EQ_MSG(test, _of, of, \ + "expected " fmt " " sym " " fmt " to%s overflow " \ + "(type %s)", a, b, of ? "" : " not", #t); \ + \ + KUNIT_EXPECT_EQ_MSG(test, _got, want, \ + "wrong result for " fmt " " sym " " fmt " (type %s)", \ + a, b, #t); \ } while (0) #define DEFINE_TEST_FUNC(t, fmt) \ -static int __init do_test_ ## t(const struct test_ ## t *p) \ -{ \ - int err = 0; \ - \ +static void do_test_ ## t(struct kunit *test, const struct test_ ## t *p)\ +{ \ check_one_op(t, fmt, add, "+", p->a, p->b, p->sum, p->s_of); \ check_one_op(t, fmt, add, "+", p->b, p->a, p->sum, p->s_of); \ check_one_op(t, fmt, sub, "-", p->a, p->b, p->diff, p->d_of); \ check_one_op(t, fmt, mul, "*", p->a, p->b, p->prod, p->p_of); \ check_one_op(t, fmt, mul, "*", p->b, p->a, p->prod, p->p_of); \ - \ - return err; \ } \ \ -static int __init test_ ## t ## _overflow(void) { \ - int err = 0; \ +static void test_ ## t ## _overflow(struct kunit *test) \ +{ \ unsigned i; \ \ - pr_info("%-3s: %zu arithmetic tests\n", #t, \ - ARRAY_SIZE(t ## _tests)); \ + kunit_info(test, "%-3s: %zu arithmetic tests\n", #t, \ + ARRAY_SIZE(t ## _tests)); \ for (i = 0; i < ARRAY_SIZE(t ## _tests); ++i) \ - err |= do_test_ ## t(&t ## _tests[i]); \ - return err; \ + do_test_ ## t(test, &t ## _tests[i]); \ } DEFINE_TEST_FUNC(u8, "%d"); @@ -270,199 +259,174 @@ DEFINE_TEST_FUNC(u64, "%llu"); DEFINE_TEST_FUNC(s64, "%lld"); #endif -static int __init test_overflow_calculation(void) +static void test_overflow_shift(struct kunit *test) { - int err = 0; - - err |= test_u8_overflow(); - err |= test_s8_overflow(); - err |= test_u16_overflow(); - err |= test_s16_overflow(); - err |= test_u32_overflow(); - err |= test_s32_overflow(); -#if BITS_PER_LONG == 64 - err |= test_u64_overflow(); - err |= test_s64_overflow(); -#endif - - return err; -} - -static int __init test_overflow_shift(void) -{ - int err = 0; - /* Args are: value, shift, type, expected result, overflow expected */ -#define TEST_ONE_SHIFT(a, s, t, expect, of) ({ \ +#define TEST_ONE_SHIFT(a, s, t, expect, of) do { \ int __failed = 0; \ typeof(a) __a = (a); \ typeof(s) __s = (s); \ - t __e = (expect); \ - t __d; \ - bool __of = check_shl_overflow(__a, __s, &__d); \ + t __want = (expect); \ + t __got; \ + bool __of = check_shl_overflow(__a, __s, &__got); \ if (__of != of) { \ - pr_warn("expected (%s)(%s << %s) to%s overflow\n", \ - #t, #a, #s, of ? "" : " not"); \ + KUNIT_FAIL(test, "expected (%s)(%s << %s) to%s overflow"\ + #t, #a, #s, of ? "" : " not"); \ __failed = 1; \ - } else if (!__of && __d != __e) { \ - pr_warn("expected (%s)(%s << %s) == %s\n", \ + } else if (!__of && __got != __want) { \ + KUNIT_EXPECT_EQ_MSG(test, __got, __want, \ + "expected (%s)(%s << %s) == %s", \ #t, #a, #s, #expect); \ - if ((t)-1 < 0) \ - pr_warn("got %lld\n", (s64)__d); \ - else \ - pr_warn("got %llu\n", (u64)__d); \ __failed = 1; \ } \ if (!__failed) \ - pr_info("ok: (%s)(%s << %s) == %s\n", #t, #a, #s, \ - of ? "overflow" : #expect); \ - __failed; \ -}) + kunit_info(test, "ok: (%s)(%s << %s) == %s\n", #t, #a, \ + #s, of ? "overflow" : #expect); \ +} while (0) /* Sane shifts. */ - err |= TEST_ONE_SHIFT(1, 0, u8, 1 << 0, false); - err |= TEST_ONE_SHIFT(1, 4, u8, 1 << 4, false); - err |= TEST_ONE_SHIFT(1, 7, u8, 1 << 7, false); - err |= TEST_ONE_SHIFT(0xF, 4, u8, 0xF << 4, false); - err |= TEST_ONE_SHIFT(1, 0, u16, 1 << 0, false); - err |= TEST_ONE_SHIFT(1, 10, u16, 1 << 10, false); - err |= TEST_ONE_SHIFT(1, 15, u16, 1 << 15, false); - err |= TEST_ONE_SHIFT(0xFF, 8, u16, 0xFF << 8, false); - err |= TEST_ONE_SHIFT(1, 0, int, 1 << 0, false); - err |= TEST_ONE_SHIFT(1, 16, int, 1 << 16, false); - err |= TEST_ONE_SHIFT(1, 30, int, 1 << 30, false); - err |= TEST_ONE_SHIFT(1, 0, s32, 1 << 0, false); - err |= TEST_ONE_SHIFT(1, 16, s32, 1 << 16, false); - err |= TEST_ONE_SHIFT(1, 30, s32, 1 << 30, false); - err |= TEST_ONE_SHIFT(1, 0, unsigned int, 1U << 0, false); - err |= TEST_ONE_SHIFT(1, 20, unsigned int, 1U << 20, false); - err |= TEST_ONE_SHIFT(1, 31, unsigned int, 1U << 31, false); - err |= TEST_ONE_SHIFT(0xFFFFU, 16, unsigned int, 0xFFFFU << 16, false); - err |= TEST_ONE_SHIFT(1, 0, u32, 1U << 0, false); - err |= TEST_ONE_SHIFT(1, 20, u32, 1U << 20, false); - err |= TEST_ONE_SHIFT(1, 31, u32, 1U << 31, false); - err |= TEST_ONE_SHIFT(0xFFFFU, 16, u32, 0xFFFFU << 16, false); - err |= TEST_ONE_SHIFT(1, 0, u64, 1ULL << 0, false); - err |= TEST_ONE_SHIFT(1, 40, u64, 1ULL << 40, false); - err |= TEST_ONE_SHIFT(1, 63, u64, 1ULL << 63, false); - err |= TEST_ONE_SHIFT(0xFFFFFFFFULL, 32, u64, - 0xFFFFFFFFULL << 32, false); + TEST_ONE_SHIFT(1, 0, u8, 1 << 0, false); + TEST_ONE_SHIFT(1, 4, u8, 1 << 4, false); + TEST_ONE_SHIFT(1, 7, u8, 1 << 7, false); + TEST_ONE_SHIFT(0xF, 4, u8, 0xF << 4, false); + TEST_ONE_SHIFT(1, 0, u16, 1 << 0, false); + TEST_ONE_SHIFT(1, 10, u16, 1 << 10, false); + TEST_ONE_SHIFT(1, 15, u16, 1 << 15, false); + TEST_ONE_SHIFT(0xFF, 8, u16, 0xFF << 8, false); + TEST_ONE_SHIFT(1, 0, int, 1 << 0, false); + TEST_ONE_SHIFT(1, 16, int, 1 << 16, false); + TEST_ONE_SHIFT(1, 30, int, 1 << 30, false); + TEST_ONE_SHIFT(1, 0, s32, 1 << 0, false); + TEST_ONE_SHIFT(1, 16, s32, 1 << 16, false); + TEST_ONE_SHIFT(1, 30, s32, 1 << 30, false); + TEST_ONE_SHIFT(1, 0, unsigned int, 1U << 0, false); + TEST_ONE_SHIFT(1, 20, unsigned int, 1U << 20, false); + TEST_ONE_SHIFT(1, 31, unsigned int, 1U << 31, false); + TEST_ONE_SHIFT(0xFFFFU, 16, unsigned int, 0xFFFFU << 16, false); + TEST_ONE_SHIFT(1, 0, u32, 1U << 0, false); + TEST_ONE_SHIFT(1, 20, u32, 1U << 20, false); + TEST_ONE_SHIFT(1, 31, u32, 1U << 31, false); + TEST_ONE_SHIFT(0xFFFFU, 16, u32, 0xFFFFU << 16, false); + TEST_ONE_SHIFT(1, 0, u64, 1ULL << 0, false); + TEST_ONE_SHIFT(1, 40, u64, 1ULL << 40, false); + TEST_ONE_SHIFT(1, 63, u64, 1ULL << 63, false); + TEST_ONE_SHIFT(0xFFFFFFFFULL, 32, u64, 0xFFFFFFFFULL << 32, false); /* Sane shift: start and end with 0, without a too-wide shift. */ - err |= TEST_ONE_SHIFT(0, 7, u8, 0, false); - err |= TEST_ONE_SHIFT(0, 15, u16, 0, false); - err |= TEST_ONE_SHIFT(0, 31, unsigned int, 0, false); - err |= TEST_ONE_SHIFT(0, 31, u32, 0, false); - err |= TEST_ONE_SHIFT(0, 63, u64, 0, false); + TEST_ONE_SHIFT(0, 7, u8, 0, false); + TEST_ONE_SHIFT(0, 15, u16, 0, false); + TEST_ONE_SHIFT(0, 31, unsigned int, 0, false); + TEST_ONE_SHIFT(0, 31, u32, 0, false); + TEST_ONE_SHIFT(0, 63, u64, 0, false); /* Sane shift: start and end with 0, without reaching signed bit. */ - err |= TEST_ONE_SHIFT(0, 6, s8, 0, false); - err |= TEST_ONE_SHIFT(0, 14, s16, 0, false); - err |= TEST_ONE_SHIFT(0, 30, int, 0, false); - err |= TEST_ONE_SHIFT(0, 30, s32, 0, false); - err |= TEST_ONE_SHIFT(0, 62, s64, 0, false); + TEST_ONE_SHIFT(0, 6, s8, 0, false); + TEST_ONE_SHIFT(0, 14, s16, 0, false); + TEST_ONE_SHIFT(0, 30, int, 0, false); + TEST_ONE_SHIFT(0, 30, s32, 0, false); + TEST_ONE_SHIFT(0, 62, s64, 0, false); /* Overflow: shifted the bit off the end. */ - err |= TEST_ONE_SHIFT(1, 8, u8, 0, true); - err |= TEST_ONE_SHIFT(1, 16, u16, 0, true); - err |= TEST_ONE_SHIFT(1, 32, unsigned int, 0, true); - err |= TEST_ONE_SHIFT(1, 32, u32, 0, true); - err |= TEST_ONE_SHIFT(1, 64, u64, 0, true); + TEST_ONE_SHIFT(1, 8, u8, 0, true); + TEST_ONE_SHIFT(1, 16, u16, 0, true); + TEST_ONE_SHIFT(1, 32, unsigned int, 0, true); + TEST_ONE_SHIFT(1, 32, u32, 0, true); + TEST_ONE_SHIFT(1, 64, u64, 0, true); /* Overflow: shifted into the signed bit. */ - err |= TEST_ONE_SHIFT(1, 7, s8, 0, true); - err |= TEST_ONE_SHIFT(1, 15, s16, 0, true); - err |= TEST_ONE_SHIFT(1, 31, int, 0, true); - err |= TEST_ONE_SHIFT(1, 31, s32, 0, true); - err |= TEST_ONE_SHIFT(1, 63, s64, 0, true); + TEST_ONE_SHIFT(1, 7, s8, 0, true); + TEST_ONE_SHIFT(1, 15, s16, 0, true); + TEST_ONE_SHIFT(1, 31, int, 0, true); + TEST_ONE_SHIFT(1, 31, s32, 0, true); + TEST_ONE_SHIFT(1, 63, s64, 0, true); /* Overflow: high bit falls off unsigned types. */ /* 10010110 */ - err |= TEST_ONE_SHIFT(150, 1, u8, 0, true); + TEST_ONE_SHIFT(150, 1, u8, 0, true); /* 1000100010010110 */ - err |= TEST_ONE_SHIFT(34966, 1, u16, 0, true); + TEST_ONE_SHIFT(34966, 1, u16, 0, true); /* 10000100000010001000100010010110 */ - err |= TEST_ONE_SHIFT(2215151766U, 1, u32, 0, true); - err |= TEST_ONE_SHIFT(2215151766U, 1, unsigned int, 0, true); + TEST_ONE_SHIFT(2215151766U, 1, u32, 0, true); + TEST_ONE_SHIFT(2215151766U, 1, unsigned int, 0, true); /* 1000001000010000010000000100000010000100000010001000100010010110 */ - err |= TEST_ONE_SHIFT(9372061470395238550ULL, 1, u64, 0, true); + TEST_ONE_SHIFT(9372061470395238550ULL, 1, u64, 0, true); /* Overflow: bit shifted into signed bit on signed types. */ /* 01001011 */ - err |= TEST_ONE_SHIFT(75, 1, s8, 0, true); + TEST_ONE_SHIFT(75, 1, s8, 0, true); /* 0100010001001011 */ - err |= TEST_ONE_SHIFT(17483, 1, s16, 0, true); + TEST_ONE_SHIFT(17483, 1, s16, 0, true); /* 01000010000001000100010001001011 */ - err |= TEST_ONE_SHIFT(1107575883, 1, s32, 0, true); - err |= TEST_ONE_SHIFT(1107575883, 1, int, 0, true); + TEST_ONE_SHIFT(1107575883, 1, s32, 0, true); + TEST_ONE_SHIFT(1107575883, 1, int, 0, true); /* 0100000100001000001000000010000001000010000001000100010001001011 */ - err |= TEST_ONE_SHIFT(4686030735197619275LL, 1, s64, 0, true); + TEST_ONE_SHIFT(4686030735197619275LL, 1, s64, 0, true); /* Overflow: bit shifted past signed bit on signed types. */ /* 01001011 */ - err |= TEST_ONE_SHIFT(75, 2, s8, 0, true); + TEST_ONE_SHIFT(75, 2, s8, 0, true); /* 0100010001001011 */ - err |= TEST_ONE_SHIFT(17483, 2, s16, 0, true); + TEST_ONE_SHIFT(17483, 2, s16, 0, true); /* 01000010000001000100010001001011 */ - err |= TEST_ONE_SHIFT(1107575883, 2, s32, 0, true); - err |= TEST_ONE_SHIFT(1107575883, 2, int, 0, true); + TEST_ONE_SHIFT(1107575883, 2, s32, 0, true); + TEST_ONE_SHIFT(1107575883, 2, int, 0, true); /* 0100000100001000001000000010000001000010000001000100010001001011 */ - err |= TEST_ONE_SHIFT(4686030735197619275LL, 2, s64, 0, true); + TEST_ONE_SHIFT(4686030735197619275LL, 2, s64, 0, true); /* Overflow: values larger than destination type. */ - err |= TEST_ONE_SHIFT(0x100, 0, u8, 0, true); - err |= TEST_ONE_SHIFT(0xFF, 0, s8, 0, true); - err |= TEST_ONE_SHIFT(0x10000U, 0, u16, 0, true); - err |= TEST_ONE_SHIFT(0xFFFFU, 0, s16, 0, true); - err |= TEST_ONE_SHIFT(0x100000000ULL, 0, u32, 0, true); - err |= TEST_ONE_SHIFT(0x100000000ULL, 0, unsigned int, 0, true); - err |= TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, s32, 0, true); - err |= TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, int, 0, true); - err |= TEST_ONE_SHIFT(0xFFFFFFFFFFFFFFFFULL, 0, s64, 0, true); + TEST_ONE_SHIFT(0x100, 0, u8, 0, true); + TEST_ONE_SHIFT(0xFF, 0, s8, 0, true); + TEST_ONE_SHIFT(0x10000U, 0, u16, 0, true); + TEST_ONE_SHIFT(0xFFFFU, 0, s16, 0, true); + TEST_ONE_SHIFT(0x100000000ULL, 0, u32, 0, true); + TEST_ONE_SHIFT(0x100000000ULL, 0, unsigned int, 0, true); + TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, s32, 0, true); + TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, int, 0, true); + TEST_ONE_SHIFT(0xFFFFFFFFFFFFFFFFULL, 0, s64, 0, true); /* Nonsense: negative initial value. */ - err |= TEST_ONE_SHIFT(-1, 0, s8, 0, true); - err |= TEST_ONE_SHIFT(-1, 0, u8, 0, true); - err |= TEST_ONE_SHIFT(-5, 0, s16, 0, true); - err |= TEST_ONE_SHIFT(-5, 0, u16, 0, true); - err |= TEST_ONE_SHIFT(-10, 0, int, 0, true); - err |= TEST_ONE_SHIFT(-10, 0, unsigned int, 0, true); - err |= TEST_ONE_SHIFT(-100, 0, s32, 0, true); - err |= TEST_ONE_SHIFT(-100, 0, u32, 0, true); - err |= TEST_ONE_SHIFT(-10000, 0, s64, 0, true); - err |= TEST_ONE_SHIFT(-10000, 0, u64, 0, true); + TEST_ONE_SHIFT(-1, 0, s8, 0, true); + TEST_ONE_SHIFT(-1, 0, u8, 0, true); + TEST_ONE_SHIFT(-5, 0, s16, 0, true); + TEST_ONE_SHIFT(-5, 0, u16, 0, true); + TEST_ONE_SHIFT(-10, 0, int, 0, true); + TEST_ONE_SHIFT(-10, 0, unsigned int, 0, true); + TEST_ONE_SHIFT(-100, 0, s32, 0, true); + TEST_ONE_SHIFT(-100, 0, u32, 0, true); + TEST_ONE_SHIFT(-10000, 0, s64, 0, true); + TEST_ONE_SHIFT(-10000, 0, u64, 0, true); /* Nonsense: negative shift values. */ - err |= TEST_ONE_SHIFT(0, -5, s8, 0, true); - err |= TEST_ONE_SHIFT(0, -5, u8, 0, true); - err |= TEST_ONE_SHIFT(0, -10, s16, 0, true); - err |= TEST_ONE_SHIFT(0, -10, u16, 0, true); - err |= TEST_ONE_SHIFT(0, -15, int, 0, true); - err |= TEST_ONE_SHIFT(0, -15, unsigned int, 0, true); - err |= TEST_ONE_SHIFT(0, -20, s32, 0, true); - err |= TEST_ONE_SHIFT(0, -20, u32, 0, true); - err |= TEST_ONE_SHIFT(0, -30, s64, 0, true); - err |= TEST_ONE_SHIFT(0, -30, u64, 0, true); + TEST_ONE_SHIFT(0, -5, s8, 0, true); + TEST_ONE_SHIFT(0, -5, u8, 0, true); + TEST_ONE_SHIFT(0, -10, s16, 0, true); + TEST_ONE_SHIFT(0, -10, u16, 0, true); + TEST_ONE_SHIFT(0, -15, int, 0, true); + TEST_ONE_SHIFT(0, -15, unsigned int, 0, true); + TEST_ONE_SHIFT(0, -20, s32, 0, true); + TEST_ONE_SHIFT(0, -20, u32, 0, true); + TEST_ONE_SHIFT(0, -30, s64, 0, true); + TEST_ONE_SHIFT(0, -30, u64, 0, true); /* Overflow: shifted at or beyond entire type's bit width. */ - err |= TEST_ONE_SHIFT(0, 8, u8, 0, true); - err |= TEST_ONE_SHIFT(0, 9, u8, 0, true); - err |= TEST_ONE_SHIFT(0, 8, s8, 0, true); - err |= TEST_ONE_SHIFT(0, 9, s8, 0, true); - err |= TEST_ONE_SHIFT(0, 16, u16, 0, true); - err |= TEST_ONE_SHIFT(0, 17, u16, 0, true); - err |= TEST_ONE_SHIFT(0, 16, s16, 0, true); - err |= TEST_ONE_SHIFT(0, 17, s16, 0, true); - err |= TEST_ONE_SHIFT(0, 32, u32, 0, true); - err |= TEST_ONE_SHIFT(0, 33, u32, 0, true); - err |= TEST_ONE_SHIFT(0, 32, int, 0, true); - err |= TEST_ONE_SHIFT(0, 33, int, 0, true); - err |= TEST_ONE_SHIFT(0, 32, s32, 0, true); - err |= TEST_ONE_SHIFT(0, 33, s32, 0, true); - err |= TEST_ONE_SHIFT(0, 64, u64, 0, true); - err |= TEST_ONE_SHIFT(0, 65, u64, 0, true); - err |= TEST_ONE_SHIFT(0, 64, s64, 0, true); - err |= TEST_ONE_SHIFT(0, 65, s64, 0, true); + TEST_ONE_SHIFT(0, 8, u8, 0, true); + TEST_ONE_SHIFT(0, 9, u8, 0, true); + TEST_ONE_SHIFT(0, 8, s8, 0, true); + TEST_ONE_SHIFT(0, 9, s8, 0, true); + TEST_ONE_SHIFT(0, 16, u16, 0, true); + TEST_ONE_SHIFT(0, 17, u16, 0, true); + TEST_ONE_SHIFT(0, 16, s16, 0, true); + TEST_ONE_SHIFT(0, 17, s16, 0, true); + TEST_ONE_SHIFT(0, 32, u32, 0, true); + TEST_ONE_SHIFT(0, 33, u32, 0, true); + TEST_ONE_SHIFT(0, 32, int, 0, true); + TEST_ONE_SHIFT(0, 33, int, 0, true); + TEST_ONE_SHIFT(0, 32, s32, 0, true); + TEST_ONE_SHIFT(0, 33, s32, 0, true); + TEST_ONE_SHIFT(0, 64, u64, 0, true); + TEST_ONE_SHIFT(0, 65, u64, 0, true); + TEST_ONE_SHIFT(0, 64, s64, 0, true); + TEST_ONE_SHIFT(0, 65, s64, 0, true); /* * Corner case: for unsigned types, we fail when we've shifted @@ -473,13 +437,11 @@ static int __init test_overflow_shift(void) * signed bit). So, for now, we will test this condition but * mark it as not expected to overflow. */ - err |= TEST_ONE_SHIFT(0, 7, s8, 0, false); - err |= TEST_ONE_SHIFT(0, 15, s16, 0, false); - err |= TEST_ONE_SHIFT(0, 31, int, 0, false); - err |= TEST_ONE_SHIFT(0, 31, s32, 0, false); - err |= TEST_ONE_SHIFT(0, 63, s64, 0, false); - - return err; + TEST_ONE_SHIFT(0, 7, s8, 0, false); + TEST_ONE_SHIFT(0, 15, s16, 0, false); + TEST_ONE_SHIFT(0, 31, int, 0, false); + TEST_ONE_SHIFT(0, 31, s32, 0, false); + TEST_ONE_SHIFT(0, 63, s64, 0, false); } /* @@ -499,7 +461,7 @@ static int __init test_overflow_shift(void) #define TEST_SIZE (5 * 4096) #define DEFINE_TEST_ALLOC(func, free_func, want_arg, want_gfp, want_node)\ -static int __init test_ ## func (void *arg) \ +static void test_ ## func (struct kunit *test, void *arg) \ { \ volatile size_t a = TEST_SIZE; \ volatile size_t b = (SIZE_MAX / TEST_SIZE) + 1; \ @@ -507,31 +469,26 @@ static int __init test_ ## func (void *arg) \ \ /* Tiny allocation test. */ \ ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, 1);\ - if (!ptr) { \ - pr_warn(#func " failed regular allocation?!\n"); \ - return 1; \ - } \ + KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, ptr, \ + #func " failed regular allocation?!"); \ free ## want_arg (free_func, arg, ptr); \ \ /* Wrapped allocation test. */ \ ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \ a * b); \ - if (!ptr) { \ - pr_warn(#func " unexpectedly failed bad wrapping?!\n"); \ - return 1; \ - } \ + KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, ptr, \ + #func " unexpectedly failed bad wrapping?!"); \ free ## want_arg (free_func, arg, ptr); \ \ /* Saturated allocation test. */ \ ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \ array_size(a, b)); \ if (ptr) { \ - pr_warn(#func " missed saturation!\n"); \ + KUNIT_FAIL(test, #func " missed saturation!\n"); \ free ## want_arg (free_func, arg, ptr); \ - return 1; \ + return; \ } \ - pr_info(#func " detected saturation\n"); \ - return 0; \ + kunit_info(test, #func " detected saturation\n"); \ } /* @@ -555,60 +512,56 @@ DEFINE_TEST_ALLOC(kvzalloc_node, kvfree, 0, 1, 1); DEFINE_TEST_ALLOC(devm_kmalloc, devm_kfree, 1, 1, 0); DEFINE_TEST_ALLOC(devm_kzalloc, devm_kfree, 1, 1, 0); -static int __init test_overflow_allocation(void) +static void test_overflow_allocation(struct kunit *test) { const char device_name[] = "overflow-test"; struct device *dev; - int err = 0; /* Create dummy device for devm_kmalloc()-family tests. */ dev = root_device_register(device_name); - if (IS_ERR(dev)) { - pr_warn("Cannot register test device\n"); - return 1; - } - - err |= test_kmalloc(NULL); - err |= test_kmalloc_node(NULL); - err |= test_kzalloc(NULL); - err |= test_kzalloc_node(NULL); - err |= test_kvmalloc(NULL); - err |= test_kvmalloc_node(NULL); - err |= test_kvzalloc(NULL); - err |= test_kvzalloc_node(NULL); - err |= test_vmalloc(NULL); - err |= test_vmalloc_node(NULL); - err |= test_vzalloc(NULL); - err |= test_vzalloc_node(NULL); - err |= test_devm_kmalloc(dev); - err |= test_devm_kzalloc(dev); + KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, dev, + "Cannot register test device"); + + test_kmalloc(test, NULL); + test_kmalloc_node(test, NULL); + test_kzalloc(test, NULL); + test_kzalloc_node(test, NULL); + test_kvmalloc(test, NULL); + test_kvmalloc_node(test, NULL); + test_kvzalloc(test, NULL); + test_kvzalloc_node(test, NULL); + test_vmalloc(test, NULL); + test_vmalloc_node(test, NULL); + test_vzalloc(test, NULL); + test_vzalloc_node(test, NULL); + test_devm_kmalloc(test, dev); + test_devm_kzalloc(test, dev); device_unregister(dev); - - return err; } -static int __init test_module_init(void) -{ - int err = 0; - - err |= test_overflow_calculation(); - err |= test_overflow_shift(); - err |= test_overflow_allocation(); +static struct kunit_case overflow_test_cases[] = { + KUNIT_CASE(test_u8_overflow), + KUNIT_CASE(test_s8_overflow), + KUNIT_CASE(test_u16_overflow), + KUNIT_CASE(test_s16_overflow), + KUNIT_CASE(test_u32_overflow), + KUNIT_CASE(test_s32_overflow), +#if BITS_PER_LONG == 64 + KUNIT_CASE(test_u64_overflow), + KUNIT_CASE(test_s64_overflow), +#endif - if (err) { - pr_warn("FAIL!\n"); - err = -EINVAL; - } else { - pr_info("all tests passed\n"); - } + KUNIT_CASE(test_overflow_shift), + KUNIT_CASE(test_overflow_allocation), + {} +}; - return err; -} +static struct kunit_suite overflow_test_suite = { + .name = "lib_overflow", + .test_cases = overflow_test_cases, +}; -static void __exit test_module_exit(void) -{ } +kunit_test_suites(&overflow_test_suite); -module_init(test_module_init); -module_exit(test_module_exit); MODULE_LICENSE("Dual MIT/GPL"); base-commit: 88b06399c9c766c283e070b022b5ceafa4f63f19 -- 2.31.1.607.g51e8a6a459-goog

3 years, 5 months

3
2
0 0

[PATCH] kunit: arch/um/configs: Enable KUNIT_ALL_TESTS by default

by David Gow

Make the default .kunitconfig (specified in arch/um/configs/kunit_defconfig) specify CONFIG_KUNIT_ALL_TESTS by default. KUNIT_ALL_TESTS runs all tests which have satisfied dependencies in the current .config (which would be the architecture defconfig). Currently, the default .kunitconfig enables only the example tests and KUnit's own tests. While this does provide a good example of what a .kunitconfig for running a few individual tests should look like, it does mean that kunit_tool runs a pretty paltry collection of tests by default. A default run of ./tools/testing/kunit/kunit.py run now runs 70 tests instead of 14. Signed-off-by: David Gow <davidgow(a)google.com> --- arch/um/configs/kunit_defconfig | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/um/configs/kunit_defconfig b/arch/um/configs/kunit_defconfig index 9235b7d42d38..becf3432a375 100644 --- a/arch/um/configs/kunit_defconfig +++ b/arch/um/configs/kunit_defconfig @@ -1,3 +1,2 @@ CONFIG_KUNIT=y -CONFIG_KUNIT_TEST=y -CONFIG_KUNIT_EXAMPLE_TEST=y +CONFIG_KUNIT_ALL_TESTS=y -- 2.31.1.751.gd2f1c929bd-goog

3 years, 5 months

3
2
0 0

[PATCH v9 6/6] selftest/x86/signal: Include test cases for validating sigaltstack

by Chang S. Bae

The test measures the kernel's signal delivery with different (enough vs. insufficient) stack sizes. Signed-off-by: Chang S. Bae <chang.seok.bae(a)intel.com> Reviewed-by: Len Brown <len.brown(a)intel.com> Cc: x86(a)kernel.org Cc: linux-kselftest(a)vger.kernel.org Cc: linux-kernel(a)vger.kernel.org --- Changes from v3: * Revised test messages again (Borislav Petkov) Changes from v2: * Revised test messages (Borislav Petkov) --- tools/testing/selftests/x86/Makefile | 2 +- tools/testing/selftests/x86/sigaltstack.c | 128 ++++++++++++++++++++++ 2 files changed, 129 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/x86/sigaltstack.c diff --git a/tools/testing/selftests/x86/Makefile b/tools/testing/selftests/x86/Makefile index 333980375bc7..65bba2ae86ee 100644 --- a/tools/testing/selftests/x86/Makefile +++ b/tools/testing/selftests/x86/Makefile @@ -13,7 +13,7 @@ CAN_BUILD_WITH_NOPIE := $(shell ./check_cc.sh $(CC) trivial_program.c -no-pie) TARGETS_C_BOTHBITS := single_step_syscall sysret_ss_attrs syscall_nt test_mremap_vdso \ check_initial_reg_state sigreturn iopl ioperm \ test_vsyscall mov_ss_trap \ - syscall_arg_fault fsgsbase_restore + syscall_arg_fault fsgsbase_restore sigaltstack TARGETS_C_32BIT_ONLY := entry_from_vm86 test_syscall_vdso unwind_vdso \ test_FCMOV test_FCOMI test_FISTTP \ vdso_restorer diff --git a/tools/testing/selftests/x86/sigaltstack.c b/tools/testing/selftests/x86/sigaltstack.c new file mode 100644 index 000000000000..f689af75e979 --- /dev/null +++ b/tools/testing/selftests/x86/sigaltstack.c @@ -0,0 +1,128 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#define _GNU_SOURCE +#include <signal.h> +#include <stdio.h> +#include <stdbool.h> +#include <string.h> +#include <err.h> +#include <errno.h> +#include <limits.h> +#include <sys/mman.h> +#include <sys/auxv.h> +#include <sys/prctl.h> +#include <sys/resource.h> +#include <setjmp.h> + +/* sigaltstack()-enforced minimum stack */ +#define ENFORCED_MINSIGSTKSZ 2048 + +#ifndef AT_MINSIGSTKSZ +# define AT_MINSIGSTKSZ 51 +#endif + +static int nerrs; + +static bool sigalrm_expected; + +static unsigned long at_minstack_size; + +static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *), + int flags) +{ + struct sigaction sa; + + memset(&sa, 0, sizeof(sa)); + sa.sa_sigaction = handler; + sa.sa_flags = SA_SIGINFO | flags; + sigemptyset(&sa.sa_mask); + if (sigaction(sig, &sa, 0)) + err(1, "sigaction"); +} + +static void clearhandler(int sig) +{ + struct sigaction sa; + + memset(&sa, 0, sizeof(sa)); + sa.sa_handler = SIG_DFL; + sigemptyset(&sa.sa_mask); + if (sigaction(sig, &sa, 0)) + err(1, "sigaction"); +} + +static int setup_altstack(void *start, unsigned long size) +{ + stack_t ss; + + memset(&ss, 0, sizeof(ss)); + ss.ss_size = size; + ss.ss_sp = start; + + return sigaltstack(&ss, NULL); +} + +static jmp_buf jmpbuf; + +static void sigsegv(int sig, siginfo_t *info, void *ctx_void) +{ + if (sigalrm_expected) { + printf("[FAIL]\tWrong signal delivered: SIGSEGV (expected SIGALRM)."); + nerrs++; + } else { + printf("[OK]\tSIGSEGV signal delivered.\n"); + } + + siglongjmp(jmpbuf, 1); +} + +static void sigalrm(int sig, siginfo_t *info, void *ctx_void) +{ + if (!sigalrm_expected) { + printf("[FAIL]\tWrong signal delivered: SIGALRM (expected SIGSEGV)."); + nerrs++; + } else { + printf("[OK]\tSIGALRM signal delivered.\n"); + } +} + +static void test_sigaltstack(void *altstack, unsigned long size) +{ + if (setup_altstack(altstack, size)) + err(1, "sigaltstack()"); + + sigalrm_expected = (size > at_minstack_size) ? true : false; + + sethandler(SIGSEGV, sigsegv, 0); + sethandler(SIGALRM, sigalrm, SA_ONSTACK); + + if (!sigsetjmp(jmpbuf, 1)) { + printf("[RUN]\tTest an alternate signal stack of %ssufficient size.\n", + sigalrm_expected ? "" : "in"); + printf("\tRaise SIGALRM. %s is expected to be delivered.\n", + sigalrm_expected ? "It" : "SIGSEGV"); + raise(SIGALRM); + } + + clearhandler(SIGALRM); + clearhandler(SIGSEGV); +} + +int main(void) +{ + void *altstack; + + at_minstack_size = getauxval(AT_MINSIGSTKSZ); + + altstack = mmap(NULL, at_minstack_size + SIGSTKSZ, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS | MAP_STACK, -1, 0); + if (altstack == MAP_FAILED) + err(1, "mmap()"); + + if ((ENFORCED_MINSIGSTKSZ + 1) < at_minstack_size) + test_sigaltstack(altstack, ENFORCED_MINSIGSTKSZ + 1); + + test_sigaltstack(altstack, at_minstack_size + SIGSTKSZ); + + return nerrs == 0 ? 0 : 1; +} -- 2.17.1

3 years, 5 months

1
0
0 0

[PATCH v9 4/6] selftest/sigaltstack: Use the AT_MINSIGSTKSZ aux vector if available

by Chang S. Bae

The SIGSTKSZ constant may not represent enough stack size in some architectures as the hardware state size grows. Use getauxval(AT_MINSIGSTKSZ) to increase the stack size. Signed-off-by: Chang S. Bae <chang.seok.bae(a)intel.com> Reviewed-by: Len Brown <len.brown(a)intel.com> Cc: linux-kselftest(a)vger.kernel.org Cc: linux-kernel(a)vger.kernel.org --- Changes from v5: * Added as a new patch. --- tools/testing/selftests/sigaltstack/sas.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) diff --git a/tools/testing/selftests/sigaltstack/sas.c b/tools/testing/selftests/sigaltstack/sas.c index 8934a3766d20..c53b070755b6 100644 --- a/tools/testing/selftests/sigaltstack/sas.c +++ b/tools/testing/selftests/sigaltstack/sas.c @@ -17,6 +17,7 @@ #include <string.h> #include <assert.h> #include <errno.h> +#include <sys/auxv.h> #include "../kselftest.h" @@ -24,6 +25,11 @@ #define SS_AUTODISARM (1U << 31) #endif +#ifndef AT_MINSIGSTKSZ +#define AT_MINSIGSTKSZ 51 +#endif + +static unsigned int stack_size; static void *sstack, *ustack; static ucontext_t uc, sc; static const char *msg = "[OK]\tStack preserved"; @@ -47,7 +53,7 @@ void my_usr1(int sig, siginfo_t *si, void *u) #endif if (sp < (unsigned long)sstack || - sp >= (unsigned long)sstack + SIGSTKSZ) { + sp >= (unsigned long)sstack + stack_size) { ksft_exit_fail_msg("SP is not on sigaltstack\n"); } /* put some data on stack. other sighandler will try to overwrite it */ @@ -108,6 +114,10 @@ int main(void) stack_t stk; int err; + /* Make sure more than the required minimum. */ + stack_size = getauxval(AT_MINSIGSTKSZ) + SIGSTKSZ; + ksft_print_msg("[NOTE]\tthe stack size is %lu\n", stack_size); + ksft_print_header(); ksft_set_plan(3); @@ -117,7 +127,7 @@ int main(void) sigaction(SIGUSR1, &act, NULL); act.sa_sigaction = my_usr2; sigaction(SIGUSR2, &act, NULL); - sstack = mmap(NULL, SIGSTKSZ, PROT_READ | PROT_WRITE, + sstack = mmap(NULL, stack_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_STACK, -1, 0); if (sstack == MAP_FAILED) { ksft_exit_fail_msg("mmap() - %s\n", strerror(errno)); @@ -139,7 +149,7 @@ int main(void) } stk.ss_sp = sstack; - stk.ss_size = SIGSTKSZ; + stk.ss_size = stack_size; stk.ss_flags = SS_ONSTACK | SS_AUTODISARM; err = sigaltstack(&stk, NULL); if (err) { @@ -161,7 +171,7 @@ int main(void) } } - ustack = mmap(NULL, SIGSTKSZ, PROT_READ | PROT_WRITE, + ustack = mmap(NULL, stack_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_STACK, -1, 0); if (ustack == MAP_FAILED) { ksft_exit_fail_msg("mmap() - %s\n", strerror(errno)); @@ -170,7 +180,7 @@ int main(void) getcontext(&uc); uc.uc_link = NULL; uc.uc_stack.ss_sp = ustack; - uc.uc_stack.ss_size = SIGSTKSZ; + uc.uc_stack.ss_size = stack_size; makecontext(&uc, switch_fn, 0); raise(SIGUSR1); -- 2.17.1

3 years, 5 months

1
0
0 0

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Linux-kselftest-mirror May 2021