- Linux-kselftest-mirror - lists.linaro.org

[PATCH v3] selftests/lam: Test get_user() LAM pointer handling

by Maciej Wieczor-Retman

Recent change in how get_user() handles pointers [1] has a specific case for LAM. It assigns a different bitmask that's later used to check whether a pointer comes from userland in get_user(). While currently commented out (until LASS [2] is merged into the kernel) it's worth making changes to the LAM selftest ahead of time. Add test case to LAM that utilizes a ioctl (FIOASYNC) syscall which uses get_user() in its implementation. Execute the syscall with differently tagged pointers to verify that valid user pointers are passing through and invalid kernel/non-canonical pointers are not. Code was tested on a Sierra Forest Xeon machine that's LAM capable. The test was ran without issues with both the LAM lines from [1] untouched and commented out. The test was also ran without issues with LAM_SUP both enabled and disabled. 4/5 level pagetables code paths were also successfully tested in Simics on a 5-level capable machine. [1] https://lore.kernel.org/all/20241024013214.129639-1-torvalds@linux-foundati… [2] https://lore.kernel.org/all/20240710160655.3402786-1-alexander.shishkin@lin… Signed-off-by: Maciej Wieczor-Retman <maciej.wieczor-retman(a)intel.com> --- Changelog v3: - mmap the pointer passed to get_user to high address if 5 level paging is enabled and to low address if 4 level paging is enabled. Changelog v2: - Use mmap with HIGH_ADDR to check if we're in 5 or 4 level pagetables. tools/testing/selftests/x86/lam.c | 110 ++++++++++++++++++++++++++++++ 1 file changed, 110 insertions(+) diff --git a/tools/testing/selftests/x86/lam.c b/tools/testing/selftests/x86/lam.c index 0ea4f6813930..616a523c3262 100644 --- a/tools/testing/selftests/x86/lam.c +++ b/tools/testing/selftests/x86/lam.c @@ -4,6 +4,7 @@ #include <stdlib.h> #include <string.h> #include <sys/syscall.h> +#include <sys/ioctl.h> #include <time.h> #include <signal.h> #include <setjmp.h> @@ -43,7 +44,15 @@ #define FUNC_INHERITE 0x20 #define FUNC_PASID 0x40 +/* get_user() pointer test cases */ +#define GET_USER_USER 0 +#define GET_USER_KERNEL_TOP 1 +#define GET_USER_KERNEL_BOT 2 +#define GET_USER_KERNEL 3 + #define TEST_MASK 0x7f +#define L5_SIGN_EXT_MASK (0xFFUL << 56) +#define L4_SIGN_EXT_MASK (0x1FFFFUL << 47) #define LOW_ADDR (0x1UL << 30) #define HIGH_ADDR (0x3UL << 48) @@ -370,6 +379,80 @@ static int handle_syscall(struct testcases *test) return ret; } +static int get_user_syscall(struct testcases *test) +{ + uint64_t ptr_address, bitmask; + void *p, *ptr; + int ret = 0; + int fd; + + p = mmap((void *)HIGH_ADDR, 1, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0); + + if (p == MAP_FAILED) { + bitmask = L4_SIGN_EXT_MASK; + ptr_address = LOW_ADDR; + + } else { + bitmask = L5_SIGN_EXT_MASK; + ptr_address = HIGH_ADDR; + } + + munmap(p, 1); + + ptr = mmap((void *)ptr_address, 1, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0); + + if (ptr == MAP_FAILED) { + perror("failed to map byte to pass into get_user"); + return 1; + } + + if (test->lam != 0) { + if (set_lam(test->lam) != 0) { + ret = 2; + goto error; + } + } + + fd = memfd_create("lam_ioctl", 0); + if (fd == -1) { + munmap(ptr, 1); + exit(EXIT_FAILURE); + } + + switch (test->later) { + case GET_USER_USER: + /* Control group - properly tagger user pointer */ + ptr = (void *)set_metadata((uint64_t)ptr, test->lam); + break; + case GET_USER_KERNEL_TOP: + /* Kernel address with top bit cleared */ + bitmask &= (bitmask >> 1); + ptr = (void *)((uint64_t)ptr | bitmask); + break; + case GET_USER_KERNEL_BOT: + /* Kernel address with bottom sign-extension bit cleared */ + bitmask &= (bitmask << 1); + ptr = (void *)((uint64_t)ptr | bitmask); + break; + case GET_USER_KERNEL: + /* Try to pass a kernel address */ + ptr = (void *)((uint64_t)ptr | bitmask); + break; + default: + printf("Invalid test case value passed!\n"); + break; + } + + if (ioctl(fd, FIOASYNC, ptr) != 0) + ret = 1; + +error: + munmap(ptr, 1); + return ret; +} + int sys_uring_setup(unsigned int entries, struct io_uring_params *p) { return (int)syscall(__NR_io_uring_setup, entries, p); @@ -883,6 +966,33 @@ static struct testcases syscall_cases[] = { .test_func = handle_syscall, .msg = "SYSCALL:[Negative] Disable LAM. Dereferencing pointer with metadata.\n", }, + { + .later = GET_USER_USER, + .lam = LAM_U57_BITS, + .test_func = get_user_syscall, + .msg = "GET_USER: get_user() and pass a properly tagged user pointer.\n", + }, + { + .later = GET_USER_KERNEL_TOP, + .expected = 1, + .lam = LAM_U57_BITS, + .test_func = get_user_syscall, + .msg = "GET_USER:[Negative] get_user() with a kernel pointer and the top bit cleared.\n", + }, + { + .later = GET_USER_KERNEL_BOT, + .expected = 1, + .lam = LAM_U57_BITS, + .test_func = get_user_syscall, + .msg = "GET_USER:[Negative] get_user() with a kernel pointer and the bottom sign-extension bit cleared.\n", + }, + { + .later = GET_USER_KERNEL, + .expected = 1, + .lam = LAM_U57_BITS, + .test_func = get_user_syscall, + .msg = "GET_USER:[Negative] get_user() and pass a kernel pointer.\n", + }, }; static struct testcases mmap_cases[] = { -- 2.46.2

5 months

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[PATCH v5] Kunit to check the longest symbol length

by Sergio González Collado

The longest length of a symbol (KSYM_NAME_LEN) was increased to 512 in the reference [1]. This patch adds kunit test suite to check the longest symbol length. These tests verify that the longest symbol length defined is supported. This test can also help other efforts for longer symbol length, like [2]. The test suite defines two symbols, one with the longest length defined, and other one whit the longest length defined +1. In the test suite there are four tests, three positive and one negative. The first and third tests, verify that functions with names of the created symbols, can be called or not. The second and fourth tests, verify that the symbols are created (or not) in the kernel symbol table. [1] https://lore.kernel.org/lkml/20220802015052.10452-6-ojeda@kernel.org/ [2] https://lore.kernel.org/lkml/20240605032120.3179157-1-song@kernel.org/ Tested-by: Martin Rodriguez Reboredo <yakoyoku(a)gmail.com> Reviewed-by: Shuah Khan <skhan(a)linuxfoundation.org> Signed-off-by: Sergio González Collado <sergio.collado(a)gmail.com> Link: https://github.com/Rust-for-Linux/linux/issues/504 --- V1 -> V2: corrected CI tests. Added fix proposed at [3] [3] https://lore.kernel.org/lkml/Y9ES4UKl%2F+DtvAVS@gmail.com/T/#m3ef0e12bb834d… --- V2 -> V3: updated base and added MODULE_DESCRIPTION() and MODULE_AUTHOR() --- V3 -> V4: add x86 mantainers, add new reference. --- V4 -> V5: fixed typo, added improved description The test execution shoud result in something like: ``` [20:04:35] =============== longest-symbol (4 subtests) ================ [20:04:35] [PASSED] test_longest_symbol [20:04:35] [PASSED] test_longest_symbol_kallsyms [20:04:35] [PASSED] test_longest_symbol_plus1 [20:04:35] [PASSED] test_longest_symbol_plus1_kallsyms [20:04:35] ================= [PASSED] longest-symbol ================== [20:04:35] ============================================================ [20:04:35] Testing complete. Ran 4 tests: passed: 4 ``` But also there are two warnings like: ``` Symbol snnnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnnnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7ne too long for kallsyms (512 >= 512). Please increase KSYM_NAME_LEN both in kernel and kallsyms.c ``` Because the tests try to generate simbols of the same length as KSYM_NAME_LEN. This is the expected outcome, as defined: https://lore.kernel.org/all/20131023130753.GO29695@two.firstfloor.org/ --- arch/x86/tools/insn_decoder_test.c | 3 +- lib/Kconfig.debug | 9 +++ lib/Makefile | 2 + lib/longest_symbol_kunit.c | 125 +++++++++++++++++++++++++++++ 4 files changed, 138 insertions(+), 1 deletion(-) create mode 100644 lib/longest_symbol_kunit.c diff --git a/arch/x86/tools/insn_decoder_test.c b/arch/x86/tools/insn_decoder_test.c index 472540aeabc2..3bde35ea4188 100644 --- a/arch/x86/tools/insn_decoder_test.c +++ b/arch/x86/tools/insn_decoder_test.c @@ -10,6 +10,7 @@ #include <assert.h> #include <unistd.h> #include <stdarg.h> +#include <linux/kallsysms.h> #define unlikely(cond) (cond) @@ -106,7 +107,7 @@ static void parse_args(int argc, char **argv) } } -#define BUFSIZE 256 +#define BUFSIZE (256 + KSYM_NAME_LEN) int main(int argc, char **argv) { diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 7312ae7c3cc5..1f3059176637 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -2820,6 +2820,15 @@ config FORTIFY_KUNIT_TEST by the str*() and mem*() family of functions. For testing runtime traps of FORTIFY_SOURCE, see LKDTM's "FORTIFY_*" tests. +config LONGEST_SYM_KUNIT_TEST + tristate "Test the longest symbol possible" if !KUNIT_ALL_TESTS + depends on KUNIT && KPROBES + default KUNIT_ALL_TESTS + help + Tests the longest symbol possible + + If unsure, say N. + config HW_BREAKPOINT_KUNIT_TEST bool "Test hw_breakpoint constraints accounting" if !KUNIT_ALL_TESTS depends on HAVE_HW_BREAKPOINT diff --git a/lib/Makefile b/lib/Makefile index 773adf88af41..fc878e716825 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -389,6 +389,8 @@ CFLAGS_fortify_kunit.o += $(DISABLE_STRUCTLEAK_PLUGIN) obj-$(CONFIG_FORTIFY_KUNIT_TEST) += fortify_kunit.o obj-$(CONFIG_SIPHASH_KUNIT_TEST) += siphash_kunit.o obj-$(CONFIG_USERCOPY_KUNIT_TEST) += usercopy_kunit.o +obj-$(CONFIG_LONGEST_SYM_KUNIT_TEST) += longest_symbol_kunit.o +CFLAGS_longest_symbol_kunit.o += $(call cc-disable-warning, missing-prototypes) obj-$(CONFIG_GENERIC_LIB_DEVMEM_IS_ALLOWED) += devmem_is_allowed.o diff --git a/lib/longest_symbol_kunit.c b/lib/longest_symbol_kunit.c new file mode 100644 index 000000000000..ebd26eedbf7b --- /dev/null +++ b/lib/longest_symbol_kunit.c @@ -0,0 +1,125 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Test the longest symbol length. Execute with: + * ./tools/testing/kunit/kunit.py run longest-symbol + * --arch=x86_64 --kconfig_add CONFIG_KPROBES=y --kconfig_add CONFIG_MODULES=y + * --kconfig_add CONFIG_RETPOLINE=n --kconfig_add CONFIG_CFI_CLANG=n + * --kconfig_add CONFIG_MITIGATION_RETPOLINE=n + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <kunit/test.h> +#include <linux/stringify.h> +#include <linux/kprobes.h> +#include <linux/kallsyms.h> + +#define DI(name) s##name##name +#define DDI(name) DI(n##name##name) +#define DDDI(name) DDI(n##name##name) +#define DDDDI(name) DDDI(n##name##name) +#define DDDDDI(name) DDDDI(n##name##name) + +#define PLUS1(name) __PASTE(name, e) + +/*Generate a symbol whose name length is 511 */ +#define LONGEST_SYM_NAME DDDDDI(g1h2i3j4k5l6m7n) + +/*Generate a symbol whose name length is 512 */ +#define LONGEST_SYM_NAME_PLUS1 PLUS1(LONGEST_SYM_NAME) + +#define RETURN_LONGEST_SYM 0xAAAAA +#define RETURN_LONGEST_SYM_PLUS1 0x55555 + +noinline int LONGEST_SYM_NAME(void); +noinline int LONGEST_SYM_NAME(void) +{ + return RETURN_LONGEST_SYM; +} + +noinline int LONGEST_SYM_NAME_PLUS1(void); +noinline int LONGEST_SYM_NAME_PLUS1(void) +{ + return RETURN_LONGEST_SYM_PLUS1; +} + +_Static_assert(sizeof(__stringify(LONGEST_SYM_NAME)) == KSYM_NAME_LEN, +"Incorrect symbol length found. Expected KSYM_NAME_LEN: " +__stringify(KSYM_NAME) ", but found: " +__stringify(sizeof(LONGEST_SYM_NAME))); + +static void test_longest_symbol(struct kunit *test) +{ + KUNIT_EXPECT_EQ(test, RETURN_LONGEST_SYM, LONGEST_SYM_NAME()); +}; + +static void test_longest_symbol_kallsyms(struct kunit *test) +{ + unsigned long (*kallsyms_lookup_name)(const char *name); + static int (*longest_sym)(void); + + struct kprobe kp = { + .symbol_name = "kallsyms_lookup_name", + }; + + if (register_kprobe(&kp) < 0) { + pr_info("%s: kprobe not registered\n", __func__); + KUNIT_FAIL(test, "test_longest_symbol kallsysms: kprobe not registered\n"); + return; + } + + kunit_warn(test, "test_longest_symbol kallsyms: kprobe registered\n"); + kallsyms_lookup_name = (unsigned long (*)(const char *name))kp.addr; + unregister_kprobe(&kp); + + longest_sym = + (void *) kallsyms_lookup_name(__stringify(LONGEST_SYM_NAME)); + KUNIT_EXPECT_EQ(test, RETURN_LONGEST_SYM, longest_sym()); +}; + +static void test_longest_symbol_plus1(struct kunit *test) +{ + KUNIT_EXPECT_EQ(test, RETURN_LONGEST_SYM_PLUS1, LONGEST_SYM_NAME_PLUS1()); +}; + +static void test_longest_symbol_plus1_kallsyms(struct kunit *test) +{ + unsigned long (*kallsyms_lookup_name)(const char *name); + static int (*longest_sym_plus1)(void); + + struct kprobe kp = { + .symbol_name = "kallsyms_lookup_name", + }; + + if (register_kprobe(&kp) < 0) { + pr_info("%s: kprobe not registered\n", __func__); + KUNIT_FAIL(test, "test_longest_symbol kallsysms: kprobe not registered\n"); + return; + } + + kunit_warn(test, "test_longest_symbol_plus1 kallsyms: kprobe registered\n"); + kallsyms_lookup_name = (unsigned long (*)(const char *name))kp.addr; + unregister_kprobe(&kp); + + longest_sym_plus1 = + (void *) kallsyms_lookup_name(__stringify(LONGEST_SYM_NAME_PLUS1)); + KUNIT_EXPECT_NULL(test, longest_sym_plus1); +}; + +static struct kunit_case longest_symbol_test_cases[] = { + KUNIT_CASE(test_longest_symbol), + KUNIT_CASE(test_longest_symbol_kallsyms), + KUNIT_CASE(test_longest_symbol_plus1), + KUNIT_CASE(test_longest_symbol_plus1_kallsyms), + {} +}; + +static struct kunit_suite longest_symbol_test_suite = { + .name = "longest-symbol", + .test_cases = longest_symbol_test_cases, +}; +kunit_test_suite(longest_symbol_test_suite); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Test the longest symbol length"); +MODULE_AUTHOR("Sergio González Collado"); -- 2.39.2

5 months

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[PATCH net-next v4 0/5] net: Improve netns handling in RTNL and ip_tunnel

by Xiao Liang

This patch series includes some netns-related improvements and fixes for RTNL and ip_tunnel, to make link creation more intuitive: - Creating link in another net namespace doesn't conflict with link names in current one. - Refector rtnetlink link creation. Create link in target namespace directly. Pass both source and link netns to drivers via newlink() callback. So that # ip link add netns ns1 link-netns ns2 tun0 type gre ... will create tun0 in ns1, rather than create it in ns2 and move to ns1. And don't conflict with another interface named "tun0" in current netns. --- v4: - Pack newlink() parameters to a single struct. - Use ynl async_msg_queue.empty() in selftest. v3: link: https://lore.kernel.org/all/20241113125715.150201-1-shaw.leon@gmail.com/ - Drop "netns_atomic" flag and module parameter. Add netns parameter to newlink() instead, and convert drivers accordingly. - Move python NetNSEnter helper to net selftest lib. v2: link: https://lore.kernel.org/all/20241107133004.7469-1-shaw.leon@gmail.com/ - Check NLM_F_EXCL to ensure only link creation is affected. - Add self tests for link name/ifindex conflict and notifications in different netns. - Changes in dummy driver and ynl in order to add the test case. v1: link: https://lore.kernel.org/all/20241023023146.372653-1-shaw.leon@gmail.com/ Xiao Liang (5): net: ip_tunnel: Build flow in underlay net namespace rtnetlink: Lookup device in target netns when creating link rtnetlink: Decouple net namespaces in rtnl_newlink_create() selftests: net: Add python context manager for netns entering selftests: net: Add two test cases for link netns drivers/infiniband/ulp/ipoib/ipoib_netlink.c | 11 ++++-- drivers/net/amt.c | 13 ++++--- drivers/net/bareudp.c | 11 ++++-- drivers/net/bonding/bond_netlink.c | 8 ++-- drivers/net/can/dev/netlink.c | 4 +- drivers/net/can/vxcan.c | 11 ++++-- .../ethernet/qualcomm/rmnet/rmnet_config.c | 11 ++++-- drivers/net/geneve.c | 11 ++++-- drivers/net/gtp.c | 9 +++-- drivers/net/ipvlan/ipvlan.h | 4 +- drivers/net/ipvlan/ipvlan_main.c | 11 ++++-- drivers/net/ipvlan/ipvtap.c | 7 ++-- drivers/net/macsec.c | 11 ++++-- drivers/net/macvlan.c | 8 ++-- drivers/net/macvtap.c | 8 ++-- drivers/net/netkit.c | 11 ++++-- drivers/net/pfcp.c | 8 ++-- drivers/net/ppp/ppp_generic.c | 10 +++-- drivers/net/team/team_core.c | 7 ++-- drivers/net/veth.c | 11 ++++-- drivers/net/vrf.c | 7 ++-- drivers/net/vxlan/vxlan_core.c | 11 ++++-- drivers/net/wireguard/device.c | 8 ++-- drivers/net/wireless/virtual/virt_wifi.c | 10 +++-- drivers/net/wwan/wwan_core.c | 15 +++++-- include/net/ip_tunnels.h | 5 ++- include/net/rtnetlink.h | 34 +++++++++++++--- net/8021q/vlan_netlink.c | 11 ++++-- net/batman-adv/soft-interface.c | 8 ++-- net/bridge/br_netlink.c | 8 ++-- net/caif/chnl_net.c | 6 +-- net/core/rtnetlink.c | 29 +++++++++----- net/hsr/hsr_netlink.c | 14 ++++--- net/ieee802154/6lowpan/core.c | 9 +++-- net/ipv4/ip_gre.c | 27 ++++++++----- net/ipv4/ip_tunnel.c | 16 ++++---- net/ipv4/ip_vti.c | 10 +++-- net/ipv4/ipip.c | 10 +++-- net/ipv6/ip6_gre.c | 28 +++++++------ net/ipv6/ip6_tunnel.c | 16 ++++---- net/ipv6/ip6_vti.c | 15 ++++--- net/ipv6/sit.c | 16 ++++---- net/xfrm/xfrm_interface_core.c | 14 +++---- tools/testing/selftests/net/Makefile | 1 + .../testing/selftests/net/lib/py/__init__.py | 2 +- tools/testing/selftests/net/lib/py/netns.py | 18 +++++++++ tools/testing/selftests/net/netns-name.sh | 10 +++++ tools/testing/selftests/net/netns_atomic.py | 39 +++++++++++++++++++ 48 files changed, 377 insertions(+), 205 deletions(-) create mode 100755 tools/testing/selftests/net/netns_atomic.py -- 2.47.0

5 months

3
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[PATCH net v2 2/2] selftests: net: test extacks in netlink dumps

by Jakub Kicinski

Test that extacks in dumps work. The test fills up the receive buffer to test both the inline dump (as part of sendmsg()) and delayed one (run during recvmsg()). Use YNL helpers to parse the messages. We need to add the test to YNL file to make sure the right include path are used. Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> --- CC: linux-kselftest(a)vger.kernel.org --- tools/testing/selftests/net/Makefile | 3 +- tools/testing/selftests/net/netlink-dumps.c | 129 ++++++++++++++++++++ 2 files changed, 130 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile index 5e86f7a51b43..c427ee32b193 100644 --- a/tools/testing/selftests/net/Makefile +++ b/tools/testing/selftests/net/Makefile @@ -78,7 +78,6 @@ TEST_PROGS += test_vxlan_vnifiltering.sh TEST_GEN_FILES += io_uring_zerocopy_tx TEST_PROGS += io_uring_zerocopy_tx.sh TEST_GEN_FILES += bind_bhash -TEST_GEN_PROGS += netlink-dumps TEST_GEN_PROGS += sk_bind_sendto_listen TEST_GEN_PROGS += sk_connect_zero_addr TEST_GEN_PROGS += sk_so_peek_off @@ -100,7 +99,7 @@ TEST_PROGS += bpf_offload.py # YNL files, must be before "include ..lib.mk" EXTRA_CLEAN += $(OUTPUT)/libynl.a -YNL_GEN_FILES := ncdevmem +YNL_GEN_FILES := ncdevmem netlink-dumps TEST_GEN_FILES += $(YNL_GEN_FILES) TEST_FILES := settings diff --git a/tools/testing/selftests/net/netlink-dumps.c b/tools/testing/selftests/net/netlink-dumps.c index 7ee6dcd334df..195febbf6a61 100644 --- a/tools/testing/selftests/net/netlink-dumps.c +++ b/tools/testing/selftests/net/netlink-dumps.c @@ -12,11 +12,140 @@ #include <unistd.h> #include <linux/genetlink.h> +#include <linux/neighbour.h> +#include <linux/netdevice.h> #include <linux/netlink.h> #include <linux/mqueue.h> +#include <linux/rtnetlink.h> #include "../kselftest_harness.h" +#include <ynl.h> + +struct ext_ack { + int err; + + __u32 attr_offs; + __u32 miss_type; + __u32 miss_nest; + const char *str; +}; + +/* 0: no done, 1: done found, 2: extack found, -1: error */ +static int nl_get_extack(char *buf, size_t n, struct ext_ack *ea) +{ + const struct nlmsghdr *nlh; + const struct nlattr *attr; + ssize_t rem; + + for (rem = n; rem > 0; NLMSG_NEXT(nlh, rem)) { + nlh = (struct nlmsghdr *)&buf[n - rem]; + if (!NLMSG_OK(nlh, rem)) + return -1; + + if (nlh->nlmsg_type != NLMSG_DONE) + continue; + + ea->err = -*(int *)NLMSG_DATA(nlh); + + if (!(nlh->nlmsg_flags & NLM_F_ACK_TLVS)) + return 1; + + ynl_attr_for_each(attr, nlh, sizeof(int)) { + switch (ynl_attr_type(attr)) { + case NLMSGERR_ATTR_OFFS: + ea->attr_offs = ynl_attr_get_u32(attr); + break; + case NLMSGERR_ATTR_MISS_TYPE: + ea->miss_type = ynl_attr_get_u32(attr); + break; + case NLMSGERR_ATTR_MISS_NEST: + ea->miss_nest = ynl_attr_get_u32(attr); + break; + case NLMSGERR_ATTR_MSG: + ea->str = ynl_attr_get_str(attr); + break; + } + } + + return 2; + } + + return 0; +} + +static const struct { + struct nlmsghdr nlhdr; + struct ndmsg ndm; + struct nlattr ahdr; + __u32 val; +} dump_neigh_bad = { + .nlhdr = { + .nlmsg_len = sizeof(dump_neigh_bad), + .nlmsg_type = RTM_GETNEIGH, + .nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_DUMP, + .nlmsg_seq = 1, + }, + .ndm = { + .ndm_family = 123, + }, + .ahdr = { + .nla_len = 4 + 4, + .nla_type = NDA_FLAGS_EXT, + }, + .val = -1, // should fail MASK validation +}; + +TEST(dump_extack) +{ + int netlink_sock; + char buf[8192]; + int one = 1; + int i, cnt; + ssize_t n; + + netlink_sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); + ASSERT_GE(netlink_sock, 0); + + n = setsockopt(netlink_sock, SOL_NETLINK, NETLINK_CAP_ACK, + &one, sizeof(one)); + ASSERT_EQ(n, 0); + n = setsockopt(netlink_sock, SOL_NETLINK, NETLINK_EXT_ACK, + &one, sizeof(one)); + ASSERT_EQ(n, 0); + n = setsockopt(netlink_sock, SOL_NETLINK, NETLINK_GET_STRICT_CHK, + &one, sizeof(one)); + ASSERT_EQ(n, 0); + + /* Dump so many times we fill up the buffer */ + cnt = 64; + for (i = 0; i < cnt; i++) { + n = send(netlink_sock, &dump_neigh_bad, + sizeof(dump_neigh_bad), 0); + ASSERT_EQ(n, sizeof(dump_neigh_bad)); + } + + /* Read out the ENOBUFS */ + n = recv(netlink_sock, buf, sizeof(buf), MSG_DONTWAIT); + EXPECT_EQ(n, -1); + EXPECT_EQ(errno, ENOBUFS); + + for (i = 0; i < cnt; i++) { + struct ext_ack ea = {}; + + n = recv(netlink_sock, buf, sizeof(buf), MSG_DONTWAIT); + if (n < 0) { + ASSERT_GE(i, 10); + break; + } + ASSERT_GE(n, (ssize_t)sizeof(struct nlmsghdr)); + + EXPECT_EQ(nl_get_extack(buf, n, &ea), 2); + EXPECT_EQ(ea.attr_offs, + sizeof(struct nlmsghdr) + sizeof(struct ndmsg)); + } +} + static const struct { struct nlmsghdr nlhdr; struct genlmsghdr genlhdr; -- 2.47.0

5 months

2
1
0 0

[RFC] Test catalog template

by Donald Zickus

Hi, At Linux Plumbers, a few dozen of us gathered together to discuss how to expose what tests subsystem maintainers would like to run for every patch submitted or when CI runs tests. We agreed on a mock up of a yaml template to start gathering info. The yaml file could be temporarily stored on kernelci.org until a more permanent home could be found. Attached is a template to start the conversation. Longer story. The current problem is CI systems are not unanimous about what tests they run on submitted patches or git branches. This makes it difficult to figure out why a test failed or how to reproduce. Further, it isn't always clear what tests a normal contributor should run before posting patches. It has been long communicated that the tests LTP, xfstest and/or kselftests should be the tests to run. However, not all maintainers use those tests for their subsystems. I am hoping to either capture those tests or find ways to convince them to add their tests to the preferred locations. The goal is for a given subsystem (defined in MAINTAINERS), define a set of tests that should be run for any contributions to that subsystem. The hope is the collective CI results can be triaged collectively (because they are related) and even have the numerous flakes waived collectively (same reason) improving the ability to find and debug new test failures. Because the tests and process are known, having a human help debug any failures becomes easier. The plan is to put together a minimal yaml template that gets us going (even if it is not optimized yet) and aim for about a dozen or so subsystems. At that point we should have enough feedback to promote this more seriously and talk optimizations. Feedback encouraged. Cheers, Don --- # List of tests by subsystem # # Tests should adhere to KTAP definitions for results # # Description of section entries # # maintainer: test maintainer - name <email> # list: mailing list for discussion # version: stable version of the test # dependency: necessary distro package for testing # test: # path: internal git path or url to fetch from # cmd: command to run; ability to run locally # param: additional param necessary to run test # hardware: hardware necessary for validation # # Subsystems (alphabetical) KUNIT TEST: maintainer: - name: name1 email: email1 - name: name2 email: email2 list: version: dependency: - dep1 - dep2 test: - path: tools/testing/kunit cmd: param: - path: cmd: param: hardware: none

5 months

7
16
0 0

[PATCH livepatch/master v1 1/6] selftests/livepatch: fix test-callbacks.sh execution error

by George Guo

From: George Guo <guodongtai(a)kylinos.cn> The script test-callbacks.sh fails with the following error: $ sudo ./test-callbacks.sh TEST: target module before livepatch ... not ok - expected + result test_klp_callbacks_mod: test_klp_callbacks_mod_init % insmod test_modules/test_klp_callbacks_demo.ko livepatch: enabling patch 'test_klp_callbacks_demo' -livepatch: 'test_klp_callbacks_demo': initializing patching transition +transition: 'test_klp_callbacks_demo': initializing patching transition test_klp_callbacks_demo: pre_patch_callback: vmlinux test_klp_callbacks_demo: pre_patch_callback: test_klp_callbacks_mod -> [MODULE_STATE_LIVE] Normal state -livepatch: 'test_klp_callbacks_demo': starting patching transition -livepatch: 'test_klp_callbacks_demo': completing patching transition +transition: 'test_klp_callbacks_demo': starting patching transition +transition: 'test_klp_callbacks_demo': completing patching transition test_klp_callbacks_demo: post_patch_callback: vmlinux test_klp_callbacks_demo: post_patch_callback: test_klp_callbacks_mod -> [MODULE_STATE_LIVE] Normal state -livepatch: 'test_klp_callbacks_demo': patching complete +transition: 'test_klp_callbacks_demo': patching complete % echo 0 > /sys/kernel/livepatch/test_klp_callbacks_demo/enabled -livepatch: 'test_klp_callbacks_demo': initializing unpatching transition +transition: 'test_klp_callbacks_demo': initializing unpatching transition test_klp_callbacks_demo: pre_unpatch_callback: vmlinux test_klp_callbacks_demo: pre_unpatch_callback: test_klp_callbacks_mod -> [MODULE_STATE_LIVE] Normal state -livepatch: 'test_klp_callbacks_demo': starting unpatching transition -livepatch: 'test_klp_callbacks_demo': completing unpatching transition +transition: 'test_klp_callbacks_demo': starting unpatching transition +transition: 'test_klp_callbacks_demo': completing unpatching transition test_klp_callbacks_demo: post_unpatch_callback: vmlinux test_klp_callbacks_demo: post_unpatch_callback: test_klp_callbacks_mod -> [MODULE_STATE_LIVE] Normal state -livepatch: 'test_klp_callbacks_demo': unpatching complete +transition: 'test_klp_callbacks_demo': unpatching complete % rmmod test_klp_callbacks_demo % rmmod test_klp_callbacks_mod test_klp_callbacks_mod: test_klp_callbacks_mod_exit ERROR: livepatch kselftest(s) failed The issue arises due to a mismatch in expected log output during livepatch transition. Specifically, the logs previously contained "livepatch:" but have now been updated to "transition:". This results in test failures when comparing the output with the expected values. This patch updates the expected test output to reflect the new log format. Signed-off-by: George Guo <guodongtai(a)kylinos.cn> --- .../selftests/livepatch/test-callbacks.sh | 188 +++++++++--------- 1 file changed, 94 insertions(+), 94 deletions(-) diff --git a/tools/testing/selftests/livepatch/test-callbacks.sh b/tools/testing/selftests/livepatch/test-callbacks.sh index 32b150e25b10..08a33c15bb29 100755 --- a/tools/testing/selftests/livepatch/test-callbacks.sh +++ b/tools/testing/selftests/livepatch/test-callbacks.sh @@ -38,23 +38,23 @@ check_result "% insmod test_modules/$MOD_TARGET.ko $MOD_TARGET: ${MOD_TARGET}_init % insmod test_modules/$MOD_LIVEPATCH.ko livepatch: enabling patch '$MOD_LIVEPATCH' -livepatch: '$MOD_LIVEPATCH': initializing patching transition +transition: '$MOD_LIVEPATCH': initializing patching transition $MOD_LIVEPATCH: pre_patch_callback: vmlinux $MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state -livepatch: '$MOD_LIVEPATCH': starting patching transition -livepatch: '$MOD_LIVEPATCH': completing patching transition +transition: '$MOD_LIVEPATCH': starting patching transition +transition: '$MOD_LIVEPATCH': completing patching transition $MOD_LIVEPATCH: post_patch_callback: vmlinux $MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state -livepatch: '$MOD_LIVEPATCH': patching complete +transition: '$MOD_LIVEPATCH': patching complete % echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled -livepatch: '$MOD_LIVEPATCH': initializing unpatching transition +transition: '$MOD_LIVEPATCH': initializing unpatching transition $MOD_LIVEPATCH: pre_unpatch_callback: vmlinux $MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state -livepatch: '$MOD_LIVEPATCH': starting unpatching transition -livepatch: '$MOD_LIVEPATCH': completing unpatching transition +transition: '$MOD_LIVEPATCH': starting unpatching transition +transition: '$MOD_LIVEPATCH': completing unpatching transition $MOD_LIVEPATCH: post_unpatch_callback: vmlinux $MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state -livepatch: '$MOD_LIVEPATCH': unpatching complete +transition: '$MOD_LIVEPATCH': unpatching complete % rmmod $MOD_LIVEPATCH % rmmod $MOD_TARGET $MOD_TARGET: ${MOD_TARGET}_exit" @@ -83,26 +83,26 @@ unload_mod $MOD_TARGET check_result "% insmod test_modules/$MOD_LIVEPATCH.ko livepatch: enabling patch '$MOD_LIVEPATCH' -livepatch: '$MOD_LIVEPATCH': initializing patching transition +transition: '$MOD_LIVEPATCH': initializing patching transition $MOD_LIVEPATCH: pre_patch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': starting patching transition -livepatch: '$MOD_LIVEPATCH': completing patching transition +transition: '$MOD_LIVEPATCH': starting patching transition +transition: '$MOD_LIVEPATCH': completing patching transition $MOD_LIVEPATCH: post_patch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': patching complete +transition: '$MOD_LIVEPATCH': patching complete % insmod test_modules/$MOD_TARGET.ko livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET' $MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init $MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init $MOD_TARGET: ${MOD_TARGET}_init % echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled -livepatch: '$MOD_LIVEPATCH': initializing unpatching transition +transition: '$MOD_LIVEPATCH': initializing unpatching transition $MOD_LIVEPATCH: pre_unpatch_callback: vmlinux $MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state -livepatch: '$MOD_LIVEPATCH': starting unpatching transition -livepatch: '$MOD_LIVEPATCH': completing unpatching transition +transition: '$MOD_LIVEPATCH': starting unpatching transition +transition: '$MOD_LIVEPATCH': completing unpatching transition $MOD_LIVEPATCH: post_unpatch_callback: vmlinux $MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state -livepatch: '$MOD_LIVEPATCH': unpatching complete +transition: '$MOD_LIVEPATCH': unpatching complete % rmmod $MOD_LIVEPATCH % rmmod $MOD_TARGET $MOD_TARGET: ${MOD_TARGET}_exit" @@ -133,26 +133,26 @@ check_result "% insmod test_modules/$MOD_TARGET.ko $MOD_TARGET: ${MOD_TARGET}_init % insmod test_modules/$MOD_LIVEPATCH.ko livepatch: enabling patch '$MOD_LIVEPATCH' -livepatch: '$MOD_LIVEPATCH': initializing patching transition +transition: '$MOD_LIVEPATCH': initializing patching transition $MOD_LIVEPATCH: pre_patch_callback: vmlinux $MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state -livepatch: '$MOD_LIVEPATCH': starting patching transition -livepatch: '$MOD_LIVEPATCH': completing patching transition +transition: '$MOD_LIVEPATCH': starting patching transition +transition: '$MOD_LIVEPATCH': completing patching transition $MOD_LIVEPATCH: post_patch_callback: vmlinux $MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state -livepatch: '$MOD_LIVEPATCH': patching complete +transition: '$MOD_LIVEPATCH': patching complete % rmmod $MOD_TARGET $MOD_TARGET: ${MOD_TARGET}_exit $MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away livepatch: reverting patch '$MOD_LIVEPATCH' on unloading module '$MOD_TARGET' $MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away % echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled -livepatch: '$MOD_LIVEPATCH': initializing unpatching transition +transition: '$MOD_LIVEPATCH': initializing unpatching transition $MOD_LIVEPATCH: pre_unpatch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': starting unpatching transition -livepatch: '$MOD_LIVEPATCH': completing unpatching transition +transition: '$MOD_LIVEPATCH': starting unpatching transition +transition: '$MOD_LIVEPATCH': completing unpatching transition $MOD_LIVEPATCH: post_unpatch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': unpatching complete +transition: '$MOD_LIVEPATCH': unpatching complete % rmmod $MOD_LIVEPATCH" @@ -179,12 +179,12 @@ unload_lp $MOD_LIVEPATCH check_result "% insmod test_modules/$MOD_LIVEPATCH.ko livepatch: enabling patch '$MOD_LIVEPATCH' -livepatch: '$MOD_LIVEPATCH': initializing patching transition +transition: '$MOD_LIVEPATCH': initializing patching transition $MOD_LIVEPATCH: pre_patch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': starting patching transition -livepatch: '$MOD_LIVEPATCH': completing patching transition +transition: '$MOD_LIVEPATCH': starting patching transition +transition: '$MOD_LIVEPATCH': completing patching transition $MOD_LIVEPATCH: post_patch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': patching complete +transition: '$MOD_LIVEPATCH': patching complete % insmod test_modules/$MOD_TARGET.ko livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET' $MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init @@ -196,12 +196,12 @@ $MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going livepatch: reverting patch '$MOD_LIVEPATCH' on unloading module '$MOD_TARGET' $MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away % echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled -livepatch: '$MOD_LIVEPATCH': initializing unpatching transition +transition: '$MOD_LIVEPATCH': initializing unpatching transition $MOD_LIVEPATCH: pre_unpatch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': starting unpatching transition -livepatch: '$MOD_LIVEPATCH': completing unpatching transition +transition: '$MOD_LIVEPATCH': starting unpatching transition +transition: '$MOD_LIVEPATCH': completing unpatching transition $MOD_LIVEPATCH: post_unpatch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': unpatching complete +transition: '$MOD_LIVEPATCH': unpatching complete % rmmod $MOD_LIVEPATCH" @@ -221,19 +221,19 @@ unload_lp $MOD_LIVEPATCH check_result "% insmod test_modules/$MOD_LIVEPATCH.ko livepatch: enabling patch '$MOD_LIVEPATCH' -livepatch: '$MOD_LIVEPATCH': initializing patching transition +transition: '$MOD_LIVEPATCH': initializing patching transition $MOD_LIVEPATCH: pre_patch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': starting patching transition -livepatch: '$MOD_LIVEPATCH': completing patching transition +transition: '$MOD_LIVEPATCH': starting patching transition +transition: '$MOD_LIVEPATCH': completing patching transition $MOD_LIVEPATCH: post_patch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': patching complete +transition: '$MOD_LIVEPATCH': patching complete % echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled -livepatch: '$MOD_LIVEPATCH': initializing unpatching transition +transition: '$MOD_LIVEPATCH': initializing unpatching transition $MOD_LIVEPATCH: pre_unpatch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': starting unpatching transition -livepatch: '$MOD_LIVEPATCH': completing unpatching transition +transition: '$MOD_LIVEPATCH': starting unpatching transition +transition: '$MOD_LIVEPATCH': completing unpatching transition $MOD_LIVEPATCH: post_unpatch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': unpatching complete +transition: '$MOD_LIVEPATCH': unpatching complete % rmmod $MOD_LIVEPATCH" @@ -258,13 +258,13 @@ check_result "% insmod test_modules/$MOD_TARGET.ko $MOD_TARGET: ${MOD_TARGET}_init % insmod test_modules/$MOD_LIVEPATCH.ko pre_patch_ret=-19 livepatch: enabling patch '$MOD_LIVEPATCH' -livepatch: '$MOD_LIVEPATCH': initializing patching transition +transition: '$MOD_LIVEPATCH': initializing patching transition test_klp_callbacks_demo: pre_patch_callback: vmlinux livepatch: pre-patch callback failed for object 'vmlinux' livepatch: failed to enable patch '$MOD_LIVEPATCH' -livepatch: '$MOD_LIVEPATCH': canceling patching transition, going to unpatch -livepatch: '$MOD_LIVEPATCH': completing unpatching transition -livepatch: '$MOD_LIVEPATCH': unpatching complete +transition: '$MOD_LIVEPATCH': canceling patching transition, going to unpatch +transition: '$MOD_LIVEPATCH': completing unpatching transition +transition: '$MOD_LIVEPATCH': unpatching complete insmod: ERROR: could not insert module test_modules/$MOD_LIVEPATCH.ko: No such device % rmmod $MOD_TARGET $MOD_TARGET: ${MOD_TARGET}_exit" @@ -297,12 +297,12 @@ unload_lp $MOD_LIVEPATCH check_result "% insmod test_modules/$MOD_LIVEPATCH.ko livepatch: enabling patch '$MOD_LIVEPATCH' -livepatch: '$MOD_LIVEPATCH': initializing patching transition +transition: '$MOD_LIVEPATCH': initializing patching transition $MOD_LIVEPATCH: pre_patch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': starting patching transition -livepatch: '$MOD_LIVEPATCH': completing patching transition +transition: '$MOD_LIVEPATCH': starting patching transition +transition: '$MOD_LIVEPATCH': completing patching transition $MOD_LIVEPATCH: post_patch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': patching complete +transition: '$MOD_LIVEPATCH': patching complete % echo -19 > /sys/module/$MOD_LIVEPATCH/parameters/pre_patch_ret % insmod test_modules/$MOD_TARGET.ko livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET' @@ -311,12 +311,12 @@ livepatch: pre-patch callback failed for object '$MOD_TARGET' livepatch: patch '$MOD_LIVEPATCH' failed for module '$MOD_TARGET', refusing to load module '$MOD_TARGET' insmod: ERROR: could not insert module test_modules/$MOD_TARGET.ko: No such device % echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled -livepatch: '$MOD_LIVEPATCH': initializing unpatching transition +transition: '$MOD_LIVEPATCH': initializing unpatching transition $MOD_LIVEPATCH: pre_unpatch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': starting unpatching transition -livepatch: '$MOD_LIVEPATCH': completing unpatching transition +transition: '$MOD_LIVEPATCH': starting unpatching transition +transition: '$MOD_LIVEPATCH': completing unpatching transition $MOD_LIVEPATCH: post_unpatch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': unpatching complete +transition: '$MOD_LIVEPATCH': unpatching complete % rmmod $MOD_LIVEPATCH" @@ -346,14 +346,14 @@ $MOD_TARGET_BUSY: busymod_work_func enter $MOD_TARGET_BUSY: busymod_work_func exit % insmod test_modules/$MOD_LIVEPATCH.ko livepatch: enabling patch '$MOD_LIVEPATCH' -livepatch: '$MOD_LIVEPATCH': initializing patching transition +transition: '$MOD_LIVEPATCH': initializing patching transition $MOD_LIVEPATCH: pre_patch_callback: vmlinux $MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state -livepatch: '$MOD_LIVEPATCH': starting patching transition -livepatch: '$MOD_LIVEPATCH': completing patching transition +transition: '$MOD_LIVEPATCH': starting patching transition +transition: '$MOD_LIVEPATCH': completing patching transition $MOD_LIVEPATCH: post_patch_callback: vmlinux $MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state -livepatch: '$MOD_LIVEPATCH': patching complete +transition: '$MOD_LIVEPATCH': patching complete % insmod test_modules/$MOD_TARGET.ko livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET' $MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init @@ -365,14 +365,14 @@ $MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going livepatch: reverting patch '$MOD_LIVEPATCH' on unloading module '$MOD_TARGET' $MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away % echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled -livepatch: '$MOD_LIVEPATCH': initializing unpatching transition +transition: '$MOD_LIVEPATCH': initializing unpatching transition $MOD_LIVEPATCH: pre_unpatch_callback: vmlinux $MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state -livepatch: '$MOD_LIVEPATCH': starting unpatching transition -livepatch: '$MOD_LIVEPATCH': completing unpatching transition +transition: '$MOD_LIVEPATCH': starting unpatching transition +transition: '$MOD_LIVEPATCH': completing unpatching transition $MOD_LIVEPATCH: post_unpatch_callback: vmlinux $MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state -livepatch: '$MOD_LIVEPATCH': unpatching complete +transition: '$MOD_LIVEPATCH': unpatching complete % rmmod $MOD_LIVEPATCH % rmmod $MOD_TARGET_BUSY $MOD_TARGET_BUSY: ${MOD_TARGET_BUSY}_exit" @@ -426,10 +426,10 @@ $MOD_TARGET_BUSY: ${MOD_TARGET_BUSY}_init $MOD_TARGET_BUSY: busymod_work_func enter % insmod test_modules/$MOD_LIVEPATCH.ko livepatch: enabling patch '$MOD_LIVEPATCH' -livepatch: '$MOD_LIVEPATCH': initializing patching transition +transition: '$MOD_LIVEPATCH': initializing patching transition $MOD_LIVEPATCH: pre_patch_callback: vmlinux $MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state -livepatch: '$MOD_LIVEPATCH': starting patching transition +transition: '$MOD_LIVEPATCH': starting patching transition % insmod test_modules/$MOD_TARGET.ko livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET' $MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init @@ -439,12 +439,12 @@ $MOD_TARGET: ${MOD_TARGET}_exit livepatch: reverting patch '$MOD_LIVEPATCH' on unloading module '$MOD_TARGET' $MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away % echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled -livepatch: '$MOD_LIVEPATCH': reversing transition from patching to unpatching -livepatch: '$MOD_LIVEPATCH': starting unpatching transition -livepatch: '$MOD_LIVEPATCH': completing unpatching transition +transition: '$MOD_LIVEPATCH': reversing transition from patching to unpatching +transition: '$MOD_LIVEPATCH': starting unpatching transition +transition: '$MOD_LIVEPATCH': completing unpatching transition $MOD_LIVEPATCH: post_unpatch_callback: vmlinux $MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state -livepatch: '$MOD_LIVEPATCH': unpatching complete +transition: '$MOD_LIVEPATCH': unpatching complete % rmmod $MOD_LIVEPATCH % rmmod $MOD_TARGET_BUSY $MOD_TARGET_BUSY: busymod_work_func exit @@ -469,34 +469,34 @@ unload_lp $MOD_LIVEPATCH check_result "% insmod test_modules/$MOD_LIVEPATCH.ko livepatch: enabling patch '$MOD_LIVEPATCH' -livepatch: '$MOD_LIVEPATCH': initializing patching transition +transition: '$MOD_LIVEPATCH': initializing patching transition $MOD_LIVEPATCH: pre_patch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': starting patching transition -livepatch: '$MOD_LIVEPATCH': completing patching transition +transition: '$MOD_LIVEPATCH': starting patching transition +transition: '$MOD_LIVEPATCH': completing patching transition $MOD_LIVEPATCH: post_patch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': patching complete +transition: '$MOD_LIVEPATCH': patching complete % insmod test_modules/$MOD_LIVEPATCH2.ko livepatch: enabling patch '$MOD_LIVEPATCH2' -livepatch: '$MOD_LIVEPATCH2': initializing patching transition +transition: '$MOD_LIVEPATCH2': initializing patching transition $MOD_LIVEPATCH2: pre_patch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH2': starting patching transition -livepatch: '$MOD_LIVEPATCH2': completing patching transition +transition: '$MOD_LIVEPATCH2': starting patching transition +transition: '$MOD_LIVEPATCH2': completing patching transition $MOD_LIVEPATCH2: post_patch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH2': patching complete +transition: '$MOD_LIVEPATCH2': patching complete % echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH2/enabled -livepatch: '$MOD_LIVEPATCH2': initializing unpatching transition +transition: '$MOD_LIVEPATCH2': initializing unpatching transition $MOD_LIVEPATCH2: pre_unpatch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH2': starting unpatching transition -livepatch: '$MOD_LIVEPATCH2': completing unpatching transition +transition: '$MOD_LIVEPATCH2': starting unpatching transition +transition: '$MOD_LIVEPATCH2': completing unpatching transition $MOD_LIVEPATCH2: post_unpatch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH2': unpatching complete +transition: '$MOD_LIVEPATCH2': unpatching complete % echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled -livepatch: '$MOD_LIVEPATCH': initializing unpatching transition +transition: '$MOD_LIVEPATCH': initializing unpatching transition $MOD_LIVEPATCH: pre_unpatch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': starting unpatching transition -livepatch: '$MOD_LIVEPATCH': completing unpatching transition +transition: '$MOD_LIVEPATCH': starting unpatching transition +transition: '$MOD_LIVEPATCH': completing unpatching transition $MOD_LIVEPATCH: post_unpatch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': unpatching complete +transition: '$MOD_LIVEPATCH': unpatching complete % rmmod $MOD_LIVEPATCH2 % rmmod $MOD_LIVEPATCH" @@ -525,27 +525,27 @@ unload_lp $MOD_LIVEPATCH check_result "% insmod test_modules/$MOD_LIVEPATCH.ko livepatch: enabling patch '$MOD_LIVEPATCH' -livepatch: '$MOD_LIVEPATCH': initializing patching transition +transition: '$MOD_LIVEPATCH': initializing patching transition $MOD_LIVEPATCH: pre_patch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': starting patching transition -livepatch: '$MOD_LIVEPATCH': completing patching transition +transition: '$MOD_LIVEPATCH': starting patching transition +transition: '$MOD_LIVEPATCH': completing patching transition $MOD_LIVEPATCH: post_patch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH': patching complete +transition: '$MOD_LIVEPATCH': patching complete % insmod test_modules/$MOD_LIVEPATCH2.ko replace=1 livepatch: enabling patch '$MOD_LIVEPATCH2' -livepatch: '$MOD_LIVEPATCH2': initializing patching transition +transition: '$MOD_LIVEPATCH2': initializing patching transition $MOD_LIVEPATCH2: pre_patch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH2': starting patching transition -livepatch: '$MOD_LIVEPATCH2': completing patching transition +transition: '$MOD_LIVEPATCH2': starting patching transition +transition: '$MOD_LIVEPATCH2': completing patching transition $MOD_LIVEPATCH2: post_patch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH2': patching complete +transition: '$MOD_LIVEPATCH2': patching complete % echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH2/enabled -livepatch: '$MOD_LIVEPATCH2': initializing unpatching transition +transition: '$MOD_LIVEPATCH2': initializing unpatching transition $MOD_LIVEPATCH2: pre_unpatch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH2': starting unpatching transition -livepatch: '$MOD_LIVEPATCH2': completing unpatching transition +transition: '$MOD_LIVEPATCH2': starting unpatching transition +transition: '$MOD_LIVEPATCH2': completing unpatching transition $MOD_LIVEPATCH2: post_unpatch_callback: vmlinux -livepatch: '$MOD_LIVEPATCH2': unpatching complete +transition: '$MOD_LIVEPATCH2': unpatching complete % rmmod $MOD_LIVEPATCH2 % rmmod $MOD_LIVEPATCH" -- 2.39.2

5 months

2
6
0 0

[PATCH v1] selftests: mm: Fix conversion specifiers in transact_test()

by guanjing

Lots of incorrect conversion specifiers. Fix them. Fixes: 46fd75d4a3c9 ("selftests: mm: add pagemap ioctl tests") Signed-off-by: guanjing <guanjing(a)cmss.chinamobile.com> --- tools/testing/selftests/mm/pagemap_ioctl.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/tools/testing/selftests/mm/pagemap_ioctl.c b/tools/testing/selftests/mm/pagemap_ioctl.c index bcc73b4e805c..fdafce0654e9 100644 --- a/tools/testing/selftests/mm/pagemap_ioctl.c +++ b/tools/testing/selftests/mm/pagemap_ioctl.c @@ -1405,9 +1405,9 @@ static void transact_test(int page_size) memset(mem, 0, 0x1000 * nthreads * pages_per_thread); count = get_dirty_pages_reset(mem, nthreads * pages_per_thread, 1, page_size); - ksft_test_result(count > 0, "%s count %d\n", __func__, count); + ksft_test_result(count > 0, "%s count %u\n", __func__, count); count = get_dirty_pages_reset(mem, nthreads * pages_per_thread, 1, page_size); - ksft_test_result(count == 0, "%s count %d\n", __func__, count); + ksft_test_result(count == 0, "%s count %u\n", __func__, count); finish = 0; for (i = 0; i < nthreads; ++i) @@ -1429,7 +1429,7 @@ static void transact_test(int page_size) ksft_exit_fail_msg("pthread_barrier_wait\n"); if (count > nthreads * access_per_thread) - ksft_exit_fail_msg("Too big count %d expected %d, iter %d\n", + ksft_exit_fail_msg("Too big count %u expected %u, iter %u\n", count, nthreads * access_per_thread, i); c = get_dirty_pages_reset(mem, nthreads * pages_per_thread, 1, page_size); @@ -1454,7 +1454,7 @@ static void transact_test(int page_size) * access and application gets page fault again for the same write. */ if (count < nthreads * access_per_thread) { - ksft_test_result_fail("Lost update, iter %d, %d vs %d.\n", i, count, + ksft_test_result_fail("Lost update, iter %u, %u vs %u.\n", i, count, nthreads * access_per_thread); return; } @@ -1467,7 +1467,7 @@ static void transact_test(int page_size) finish = 1; pthread_barrier_wait(&end_barrier); - ksft_test_result_pass("%s Extra pages %u (%.1lf%%), extra thread faults %d.\n", __func__, + ksft_test_result_pass("%s Extra pages %u (%.1lf%%), extra thread faults %u.\n", __func__, extra_pages, 100.0 * extra_pages / (iter_count * nthreads * access_per_thread), extra_thread_faults); -- 2.33.0

5 months

2
2
0 0

[PATCH v2] selftests/lam: Test get_user() LAM pointer handling

by Maciej Wieczor-Retman

Recent change in how get_user() handles pointers [1] has a specific case for LAM. It assigns a different bitmask that's later used to check whether a pointer comes from userland in get_user(). While currently commented out (until LASS [2] is merged into the kernel) it's worth making changes to the LAM selftest ahead of time. Add test case to LAM that utilizes a ioctl (FIOASYNC) syscall which uses get_user() in its implementation. Execute the syscall with differently tagged pointers to verify that valid user pointers are passing through and invalid kernel/non-canonical pointers are not. Code was tested on a Sierra Forest Xeon machine that's LAM capable. The test was ran without issues with both the LAM lines from [1] untouched and commented out. The test was also ran without issues with LAM_SUP both enabled and disabled. 4/5 level pagetables code paths were also successfully tested in Simics on a 5-level capable machine. [1] https://lore.kernel.org/all/20241024013214.129639-1-torvalds@linux-foundati… [2] https://lore.kernel.org/all/20240710160655.3402786-1-alexander.shishkin@lin… Signed-off-by: Maciej Wieczor-Retman <maciej.wieczor-retman(a)intel.com> --- Changelog v2: - Use mmap with HIGH_ADDR to check if we're in 5 or 4 level pagetables. tools/testing/selftests/x86/lam.c | 89 +++++++++++++++++++++++++++++++ 1 file changed, 89 insertions(+) diff --git a/tools/testing/selftests/x86/lam.c b/tools/testing/selftests/x86/lam.c index 0ea4f6813930..5818c075e1cd 100644 --- a/tools/testing/selftests/x86/lam.c +++ b/tools/testing/selftests/x86/lam.c @@ -4,6 +4,7 @@ #include <stdlib.h> #include <string.h> #include <sys/syscall.h> +#include <sys/ioctl.h> #include <time.h> #include <signal.h> #include <setjmp.h> @@ -43,7 +44,15 @@ #define FUNC_INHERITE 0x20 #define FUNC_PASID 0x40 +/* get_user() pointer test cases */ +#define GET_USER_USER 0 +#define GET_USER_KERNEL_TOP 1 +#define GET_USER_KERNEL_BOT 2 +#define GET_USER_KERNEL 3 + #define TEST_MASK 0x7f +#define L5_SIGN_EXT_MASK (0xFFUL << 56) +#define L4_SIGN_EXT_MASK (0x1FFFFUL << 47) #define LOW_ADDR (0x1UL << 30) #define HIGH_ADDR (0x3UL << 48) @@ -370,6 +379,59 @@ static int handle_syscall(struct testcases *test) return ret; } +static int get_user_syscall(struct testcases *test) +{ + int ptr_value = 0; + int ret = 0; + int fd; + void *p, *ptr = &ptr_value; + + p = mmap((void *)HIGH_ADDR, 1, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0); + + uint64_t bitmask = (p == MAP_FAILED) ? L4_SIGN_EXT_MASK : + L5_SIGN_EXT_MASK; + + munmap(p, 1); + + if (test->lam != 0) + if (set_lam(test->lam) != 0) + return 2; + + fd = memfd_create("lam_ioctl", 0); + if (fd == -1) + exit(EXIT_FAILURE); + + switch (test->later) { + case GET_USER_USER: + /* Control group - properly tagger user pointer */ + ptr = (void *)set_metadata((uint64_t)ptr, test->lam); + break; + case GET_USER_KERNEL_TOP: + /* Kernel address with top bit cleared */ + bitmask &= (bitmask >> 1); + ptr = (void *)((uint64_t)ptr | bitmask); + break; + case GET_USER_KERNEL_BOT: + /* Kernel address with bottom sign-extension bit cleared */ + bitmask &= (bitmask << 1); + ptr = (void *)((uint64_t)ptr | bitmask); + break; + case GET_USER_KERNEL: + /* Try to pass a kernel address */ + ptr = (void *)((uint64_t)ptr | bitmask); + break; + default: + printf("Invalid test case value passed!\n"); + break; + } + + if (ioctl(fd, FIOASYNC, ptr) != 0) + ret = 1; + + return ret; +} + int sys_uring_setup(unsigned int entries, struct io_uring_params *p) { return (int)syscall(__NR_io_uring_setup, entries, p); @@ -883,6 +945,33 @@ static struct testcases syscall_cases[] = { .test_func = handle_syscall, .msg = "SYSCALL:[Negative] Disable LAM. Dereferencing pointer with metadata.\n", }, + { + .later = GET_USER_USER, + .lam = LAM_U57_BITS, + .test_func = get_user_syscall, + .msg = "GET_USER: get_user() and pass a properly tagged user pointer.\n", + }, + { + .later = GET_USER_KERNEL_TOP, + .expected = 1, + .lam = LAM_U57_BITS, + .test_func = get_user_syscall, + .msg = "GET_USER:[Negative] get_user() with a kernel pointer and the top bit cleared.\n", + }, + { + .later = GET_USER_KERNEL_BOT, + .expected = 1, + .lam = LAM_U57_BITS, + .test_func = get_user_syscall, + .msg = "GET_USER:[Negative] get_user() with a kernel pointer and the bottom sign-extension bit cleared.\n", + }, + { + .later = GET_USER_KERNEL, + .expected = 1, + .lam = LAM_U57_BITS, + .test_func = get_user_syscall, + .msg = "GET_USER:[Negative] get_user() and pass a kernel pointer.\n", + }, }; static struct testcases mmap_cases[] = { -- 2.46.2

5 months

1
0
0 0

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5 months

1
0
0 0

[PATCH net-next] selftests: net/psock_lib: Handle EINTR and EAGAIN

by Leo Stone

Make pair_udp_send_char handle EAGAIN, EINTR, and partial reads or writes. Signed-off-by: Leo Stone <leocstone(a)gmail.com> --- tools/testing/selftests/net/psock_lib.h | 39 +++++++++++++++++++------ 1 file changed, 30 insertions(+), 9 deletions(-) diff --git a/tools/testing/selftests/net/psock_lib.h b/tools/testing/selftests/net/psock_lib.h index 6e4fef560873..e28bff95c8e2 100644 --- a/tools/testing/selftests/net/psock_lib.h +++ b/tools/testing/selftests/net/psock_lib.h @@ -13,6 +13,7 @@ #include <string.h> #include <arpa/inet.h> #include <unistd.h> +#include <stdbool.h> #include "kselftest.h" @@ -110,21 +111,41 @@ static __maybe_unused void pair_udp_open(int fds[], uint16_t port) } } +static void read_write_checked(int fd, char *buf, size_t sz, bool is_write) +{ + int bytes_processed = 0; + int ret; + + do { + if (is_write) + ret = write(fd, buf + bytes_processed, + sz - bytes_processed); + else + ret = read(fd, buf + bytes_processed, + sz - bytes_processed); + if (ret == -1) { + if (errno == EAGAIN || errno == EINTR) { + continue; + } else { + fprintf(stderr, "ERROR: %s failed, bytes left=%lu\n", + is_write ? "send" : "recv", + sz - bytes_processed); + exit(1); + } + } + bytes_processed += ret; + } while (bytes_processed < sz); +} + static __maybe_unused void pair_udp_send_char(int fds[], int num, char payload) { char buf[DATA_LEN], rbuf[DATA_LEN]; memset(buf, payload, sizeof(buf)); while (num--) { - /* Should really handle EINTR and EAGAIN */ - if (write(fds[0], buf, sizeof(buf)) != sizeof(buf)) { - fprintf(stderr, "ERROR: send failed left=%d\n", num); - exit(1); - } - if (read(fds[1], rbuf, sizeof(rbuf)) != sizeof(rbuf)) { - fprintf(stderr, "ERROR: recv failed left=%d\n", num); - exit(1); - } + read_write_checked(fds[0], buf, sizeof(buf), true); + read_write_checked(fds[1], rbuf, sizeof(rbuf), false); + if (memcmp(buf, rbuf, sizeof(buf))) { fprintf(stderr, "ERROR: data failed left=%d\n", num); exit(1); -- 2.39.5

5 months

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