Y2038

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1138 discussions

[PATCH 0/3] c6x: system call table generation for asm-generic

by Firoz Khan

This will be an automated scripts to provide easy support for add/modify/delete the system call entry by add entry in respective syscall.tbl file. System call table generation support for asm-generic is provide for c6x architecture which will use the common scripts resides in scripts directory and use syscall.tbl as inputs. This implementation will replace asm-generic- /unistd.h. This patch depends on: https://lore.kernel.org/lkml/1546439331-18646-1-git-send-email-firoz.khan@l… https://lore.kernel.org/lkml/1546520681-24453-1-git-send-email-firoz.khan@l… Firoz Khan (3): c6x: add Makefile to invoke syscall table generation script c6x: add __ARCH_NOMMU as a bugfix c6x: generate uapi and kapi headers arch/c6x/Makefile | 3 +++ arch/c6x/include/asm/Kbuild | 1 + arch/c6x/include/uapi/asm/Kbuild | 1 + arch/c6x/include/uapi/asm/unistd.h | 15 +++++++++----- arch/c6x/kernel/sys_c6x.c | 3 ++- arch/c6x/kernel/syscalls/Makefile | 41 ++++++++++++++++++++++++++++++++++++++ 6 files changed, 58 insertions(+), 6 deletions(-) create mode 100644 arch/c6x/kernel/syscalls/Makefile -- 1.9.1

6 years, 8 months

[PATCH 0/2] xtensa: Unify the system call scripts

by Firoz Khan

6 years, 8 months

[PATCH] scripts/syscalls: add system call table file for asm-generic

by Firoz Khan

Add system call table file - syscall.tbl which can be use by the system call table generation script to generate the equi- valent file for asm-generic/unistd.h for architectures which include the same file. The system call table generation script will use syscall.tbl file as input to generate the uapi and kapi header files. Added some extra abi to make the syscall.tbl file generic and can be use the same file for architectures which include the file asm-generic/unistd.h. This patch is depends on: https://lore.kernel.org/lkml/1546439331-18646-1-git-send-email-firoz.khan@l… Signed-off-by: Firoz Khan <firoz.khan(a)linaro.org> --- scripts/syscalls/syscall.tbl | 358 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 358 insertions(+) create mode 100644 scripts/syscalls/syscall.tbl diff --git a/scripts/syscalls/syscall.tbl b/scripts/syscalls/syscall.tbl new file mode 100644 index 0000000..9ab09d3 --- /dev/null +++ b/scripts/syscalls/syscall.tbl @@ -0,0 +1,358 @@ +# SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note +# +# system call numbers and entry vectors for asm-generic +# +# The format is: +# <number> <abi> <name> <entry point> <compat entry point> +# +# The <abi> is always "common" for this file. +# +0 common io_setup sys_io_setup compat_sys_io_setup +1 common io_destroy sys_io_destroy +2 common io_submit sys_io_submit compat_sys_io_submit +3 common io_cancel sys_io_cancel +4 common io_getevents sys_io_getevents compat_sys_io_getevents +# fs/xattr.c +5 common setxattr sys_setxattr +6 common lsetxattr sys_lsetxattr +7 common fsetxattr sys_fsetxattr +8 common getxattr sys_getxattr +9 common lgetxattr sys_lgetxattr +10 common fgetxattr sys_fgetxattr +11 common listxattr sys_listxattr +12 common llistxattr sys_llistxattr +13 common flistxattr sys_flistxattr +14 common removexattr sys_removexattr +15 common lremovexattr sys_lremovexattr +16 common fremovexattr sys_fremovexattr +# fs/dcache.c +17 common getcwd sys_getcwd +# fs/cookies.c +18 common lookup_dcookie sys_lookup_dcookie compat_sys_lookup_dcookie +# fs/eventfd.c +19 common eventfd2 sys_eventfd2 +# fs/eventpoll.c +20 common epoll_create1 sys_epoll_create1 +21 common epoll_ctl sys_epoll_ctl +22 common epoll_pwait sys_epoll_pwait compat_sys_epoll_pwait +# fs/fcntl.c +23 common dup sys_dup +24 common dup3 sys_dup3 +25 32 fcntl64 sys_fcntl64 compat_sys_fcntl64 +25 64 fcntl sys_fcntl +# fs/inotify_user.c +26 common inotify_init1 sys_inotify_init1 +27 common inotify_add_watch sys_inotify_add_watch +28 common inotify_rm_watch sys_inotify_rm_watch +# fs/ioctl.c +29 common ioctl sys_ioctl compat_sys_ioctl +# fs/ioprio.c +30 common ioprio_set sys_ioprio_set +31 common ioprio_get sys_ioprio_get +# fs/locks.c +32 common flock sys_flock +# fs/namei.c +33 common mknodat sys_mknodat +34 common mkdirat sys_mkdirat +35 common unlinkat sys_unlinkat +36 common symlinkat sys_symlinkat +37 common linkat sys_linkat +38 rename renameat sys_renameat +# fs/namespace.c +39 common umount2 sys_umount +40 common mount sys_mount compat_sys_mount +41 common pivot_root sys_pivot_root +# fs/nfsctl.c +42 common nfsservctl sys_ni_syscall +# fs/open.c +43 32 statfs64 sys_statfs64 compat_sys_statfs64 +43 64 statfs sys_statfs +44 32 fstatfs64 sys_fstatfs64 compat_sys_fstatfs64 +44 64 fstatfs sys_fstatfs +45 32 truncate64 sys_truncate64 compat_sys_truncate64 +45 64 truncate sys_truncate +46 32 ftruncate64 sys_ftruncate64 compat_sys_ftruncate64 +46 64 ftruncate sys_ftruncate +47 common fallocate sys_fallocate compat_sys_fallocate +48 common faccessat sys_faccessat +49 common chdir sys_chdir +50 common fchdir sys_fchdir +51 common chroot sys_chroot +52 common fchmod sys_fchmod +53 common fchmodat sys_fchmodat +54 common fchownat sys_fchownat +55 common fchown sys_fchown +56 common openat sys_openat compat_sys_openat +57 common close sys_close +58 common vhangup sys_vhangup +# fs/pipe.c +59 common pipe2 sys_pipe2 +# fs/quota.c +60 common quotactl sys_quotactl +# fs/readdir.c +61 common getdents64 sys_getdents64 +# fs/read_write.c +62 32 llseek sys_llseek +62 64 lseek sys_lseek +63 common read sys_read +64 common write sys_write +65 common readv sys_readv compat_sys_readv +66 common writev sys_writev compat_sys_writev +67 common pread64 sys_pread64 compat_sys_pread64 +68 common pwrite64 sys_pwrite64 compat_sys_pwrite64 +69 common preadv sys_preadv compat_sys_preadv +70 common pwritev sys_pwritev compat_sys_pwritev +# fs/sendfile.c +71 32 sendfile64 sys_sendfile64 +71 64 sendfile sys_sendfile64 +# fs/select.c +72 common pselect6 sys_pselect6 compat_sys_pselect6 +73 common ppoll sys_ppoll compat_sys_ppoll +# fs/signalfd.c +74 common signalfd4 sys_signalfd4 compat_sys_signalfd4 +# fs/splice.c +75 common vmsplice sys_vmsplice compat_sys_vmsplice +76 common splice sys_splice +77 common tee sys_tee +# fs/stat.c +78 common readlinkat sys_readlinkat +79 stat64 fstatat64 sys_fstatat64 +79 nwstat newfstatat sys_newfstatat +80 stat64 fstat64 sys_fstat64 +80 nwstat fstat sys_newfstat +# fs/sync.c +81 common sync sys_sync +82 common fsync sys_fsync +83 common fdatasync sys_fdatasync +84 common sync_file_range sys_sync_file_range compat_sys_sync_file_range +# fs/timerfd.c +85 common timerfd_create sys_timerfd_create +86 common timerfd_settime sys_timerfd_settime compat_sys_timerfd_settime +87 common timerfd_gettime sys_timerfd_gettime compat_sys_timerfd_gettime +# fs/utimes.c +88 common utimensat sys_utimensat compat_sys_utimensat +# kernel/acct.c +89 common acct sys_acct +# kernel/capability.c +90 common capget sys_capget +91 common capset sys_capset +# kernel/exec_domain.c +92 common personality sys_personality +# kernel/exit.c +93 common exit sys_exit +94 common exit_group sys_exit_group +95 common waitid sys_waitid compat_sys_waitid +# kernel/fork.c +96 common set_tid_address sys_set_tid_address +97 common unshare sys_unshare +# kernel/futex.c +98 common futex sys_futex compat_sys_futex +99 common set_robust_list sys_set_robust_list compat_sys_set_robust_list +100 common get_robust_list sys_get_robust_list compat_sys_get_robust_list +# kernel/hrtimer.c +101 common nanosleep sys_nanosleep compat_sys_nanosleep +# kernel/itimer.c +102 common getitimer sys_getitimer compat_sys_getitimer +103 common setitimer sys_setitimer compat_sys_setitimer +# kernel/kexec.c +104 common kexec_load sys_kexec_load compat_sys_kexec_load +# kernel/module.c +105 common init_module sys_init_module +106 common delete_module sys_delete_module +# kernel/posix-timers.c +107 common timer_create sys_timer_create compat_sys_timer_create +108 common timer_gettime sys_timer_gettime compat_sys_timer_gettime +109 common timer_getoverrun sys_timer_getoverrun +110 common timer_settime sys_timer_settime compat_sys_timer_settime +111 common timer_delete sys_timer_delete +112 common clock_settime sys_clock_settime compat_sys_clock_settime +113 common clock_gettime sys_clock_gettime compat_sys_clock_gettime +114 common clock_getres sys_clock_getres compat_sys_clock_getres +115 common clock_nanosleep sys_clock_nanosleep compat_sys_clock_nanosleep +# kernel/printk.c +116 common syslog sys_syslog +# kernel/ptrace.c +117 common ptrace sys_ptrace +# kernel/sched/core.c +118 common sched_setparam sys_sched_setparam +119 common sched_setscheduler sys_sched_setscheduler +120 common sched_getscheduler sys_sched_getscheduler +121 common sched_getparam sys_sched_getparam +122 common sched_setaffinity sys_sched_setaffinity compat_sys_sched_setaffinity +123 common sched_getaffinity sys_sched_getaffinity compat_sys_sched_getaffinity +124 common sched_yield sys_sched_yield +125 common sched_get_priority_max sys_sched_get_priority_max +126 common sched_get_priority_min sys_sched_get_priority_min +127 common sched_rr_get_interval sys_sched_rr_get_interval compat_sys_sched_rr_get_interval +# kernel/signal.c +128 common restart_syscall sys_restart_syscall +129 common kill sys_kill +130 common tkill sys_tkill +131 common tgkill sys_tgkill +132 common sigaltstack sys_sigaltstack compat_sys_sigaltstack +133 common rt_sigsuspend sys_rt_sigsuspend compat_sys_rt_sigsuspend +134 common rt_sigaction sys_rt_sigaction compat_sys_rt_sigaction +135 common rt_sigprocmask sys_rt_sigprocmask compat_sys_rt_sigprocmask +136 common rt_sigpending sys_rt_sigpending compat_sys_rt_sigpending +137 common rt_sigtimedwait sys_rt_sigtimedwait compat_sys_rt_sigtimedwait +138 common rt_sigqueueinfo sys_rt_sigqueueinfo compat_sys_rt_sigqueueinfo +139 common rt_sigreturn sys_rt_sigreturn compat_sys_rt_sigreturn +# kernel/sys.c +140 common setpriority sys_setpriority +141 common getpriority sys_getpriority +142 common reboot sys_reboot +143 common setregid sys_setregid +144 common setgid sys_setgid +145 common setreuid sys_setreuid +146 common setuid sys_setuid +147 common setresuid sys_setresuid +148 common getresuid sys_getresuid +149 common setresgid sys_setresgid +150 common getresgid sys_getresgid +151 common setfsuid sys_setfsuid +152 common setfsgid sys_setfsgid +153 common times sys_times compat_sys_times +154 common setpgid sys_setpgid +155 common getpgid sys_getpgid +156 common getsid sys_getsid +157 common setsid sys_setsid +158 common getgroups sys_getgroups +159 common setgroups sys_setgroups +160 common uname sys_newuname +161 common sethostname sys_sethostname +162 common setdomainname sys_setdomainname +163 common getrlimit sys_getrlimit compat_sys_getrlimit +164 common setrlimit sys_setrlimit compat_sys_setrlimit +165 common getrusage sys_getrusage compat_sys_getrusage +166 common umask sys_umask +167 common prctl sys_prctl +168 common getcpu sys_getcpu +169 common gettimeofday sys_gettimeofday compat_sys_gettimeofday +# kernel/time.c +170 common settimeofday sys_settimeofday compat_sys_settimeofday +171 common adjtimex sys_adjtimex compat_sys_adjtimex +# kernel/timer.c +172 common getpid sys_getpid +173 common getppid sys_getppid +174 common getuid sys_getuid +175 common geteuid sys_geteuid +176 common getgid sys_getgid +177 common getegid sys_getegid +178 common gettid sys_gettid +179 common sysinfo sys_sysinfo compat_sys_sysinfo +# ipc/mqueue.c +180 common mq_open sys_mq_open compat_sys_mq_open +181 common mq_unlink sys_mq_unlink +182 common mq_timedsend sys_mq_timedsend compat_sys_mq_timedsend +183 common mq_timedreceive sys_mq_timedreceive compat_sys_mq_timedreceive +184 common mq_notify sys_mq_notify compat_sys_mq_notify +185 common mq_getsetattr sys_mq_getsetattr compat_sys_mq_getsetattr +# ipc/msg.c +186 common msgget sys_msgget +187 common msgctl sys_msgctl compat_sys_msgctl +188 common msgrcv sys_msgrcv compat_sys_msgrcv +189 common msgsnd sys_msgsnd compat_sys_msgsnd +# ipc/sem.c +190 common semget sys_semget +191 common semctl sys_semctl compat_sys_semctl +192 common semtimedop sys_semtimedop compat_sys_semtimedop +193 common semop sys_semop +# ipc/shm.c +194 common shmget sys_shmget +195 common shmctl sys_shmctl compat_sys_shmctl +196 common shmat sys_shmat compat_sys_shmat +197 common shmdt sys_shmdt +# net/socket.c +198 common socket sys_socket +199 common socketpair sys_socketpair +200 common bind sys_bind +201 common listen sys_listen +202 common accept sys_accept +203 common connect sys_connect +204 common getsockname sys_getsockname +205 common getpeername sys_getpeername +206 common sendto sys_sendto +207 common recvfrom sys_recvfrom compat_sys_recvfrom +208 common setsockopt sys_setsockopt compat_sys_setsockopt +209 common getsockopt sys_getsockopt compat_sys_getsockopt +210 common shutdown sys_shutdown +211 common sendmsg sys_sendmsg compat_sys_sendmsg +212 common recvmsg sys_recvmsg compat_sys_recvmsg +# mm/filemap.c +213 common readahead sys_readahead compat_sys_readahead +# mm/nommu.c, also with MMU +214 common brk sys_brk +215 common munmap sys_munmap +216 common mremap sys_mremap +# security/keys/keyctl.c +217 common add_key sys_add_key +218 common request_key sys_request_key +219 common keyctl sys_keyctl compat_sys_keyctl +# arch/example/kernel/sys_example.c +220 common clone sys_clone +221 common execve sys_execve compat_sys_execve +222 32 mmap2 sys_mmap2 +222 64 mmap sys_mmap +# mm/fadvise.c +223 32 fadvise64_64 sys_fadvise64_64 compat_sys_fadvise64_64 +223 64 fadvise64 sys_fadvise64_64 +224 mmu swapon sys_swapon +225 mmu swapoff sys_swapoff +226 mmu mprotect sys_mprotect +227 mmu msync sys_msync +228 mmu mlock sys_mlock +229 mmu munlock sys_munlock +230 mmu mlockall sys_mlockall +231 mmu munlockall sys_munlockall +232 mmu mincore sys_mincore +233 mmu madvise sys_madvise +234 mmu remap_file_pages sys_remap_file_pages +235 mmu mbind sys_mbind compat_sys_mbind +236 mmu get_mempolicy sys_get_mempolicy compat_sys_get_mempolicy +237 mmu set_mempolicy sys_set_mempolicy compat_sys_set_mempolicy +238 mmu migrate_pages sys_migrate_pages compat_sys_migrate_pages +239 mmu move_pages sys_move_pages compat_sys_move_pages +240 common rt_tgsigqueueinfo sys_rt_tgsigqueueinfo compat_sys_rt_tgsigqueueinfo +241 common perf_event_open sys_perf_event_open +242 common accept4 sys_accept4 +243 common recvmmsg sys_recvmmsg compat_sys_recvmmsg +244 cachef cacheflush sys_cacheflush compat_sys_cacheflush +244 archsp arch_specific_syscall sys_arch_specific_syscall0 +245 archsp arch_specific_syscall1 sys_arch_specific_syscall1 +246 archsp arch_specific_syscall2 sys_arch_specific_syscall2 +247 archsp arch_specific_syscall3 sys_arch_specific_syscall3 +248 archsp arch_specific_syscall4 sys_arch_specific_syscall4 +260 common wait4 sys_wait4 compat_sys_wait4 +261 common prlimit64 sys_prlimit64 +262 common fanotify_init sys_fanotify_init +263 common fanotify_mark sys_fanotify_mark +264 common name_to_handle_at sys_name_to_handle_at +265 common open_by_handle_at sys_open_by_handle_at compat_sys_open_by_handle_at +266 common clock_adjtime sys_clock_adjtime compat_sys_clock_adjtime +267 common syncfs sys_syncfs +268 common setns sys_setns +269 common sendmmsg sys_sendmmsg compat_sys_sendmmsg +270 common process_vm_readv sys_process_vm_readv compat_sys_process_vm_readv +271 common process_vm_writev sys_process_vm_writev compat_sys_process_vm_writev +272 common kcmp sys_kcmp +273 common finit_module sys_finit_module +274 common sched_setattr sys_sched_setattr +275 common sched_getattr sys_sched_getattr +276 common renameat2 sys_renameat2 +277 common seccomp sys_seccomp +278 common getrandom sys_getrandom +279 common memfd_create sys_memfd_create +280 common bpf sys_bpf +281 common execveat sys_execveat compat_sys_execveat +282 common userfaultfd sys_userfaultfd +283 common membarrier sys_membarrier +284 common mlock2 sys_mlock2 +285 common copy_file_range sys_copy_file_range +286 common preadv2 sys_preadv2 compat_sys_preadv2 +287 common pwritev2 sys_pwritev2 compat_sys_pwritev2 +288 common pkey_mprotect sys_pkey_mprotect +289 common pkey_alloc sys_pkey_alloc +290 common pkey_free sys_pkey_free +291 common statx sys_statx +292 common io_pgetevents sys_io_pgetevents compat_sys_io_pgetevents +293 common rseq sys_rseq -- 1.9.1

6 years, 8 months

[PATCH] scripts: unify system call table generation scripts

by Firoz Khan

System call table generation support is provided for alpha, ia64, m68k, microblaze, mips, parisc, powerpc, sh, sparc and xtensa architectures. The implementat- ions are almost similar across all the above archte- ctures. In order to reduce the source code across all the above architectures, create common ".sh" files and keep it in the common directory, script/. This will be a generic scripts which can use for all the above architectures. Signed-off-by: Firoz Khan <firoz.khan(a)linaro.org> --- scripts/syscallhdr.sh | 37 +++++++++++++++++++++++++++++++++++++ scripts/syscallnr.sh | 32 ++++++++++++++++++++++++++++++++ scripts/syscalltbl.sh | 37 +++++++++++++++++++++++++++++++++++++ 3 files changed, 106 insertions(+) create mode 100644 scripts/syscallhdr.sh create mode 100644 scripts/syscallnr.sh create mode 100644 scripts/syscalltbl.sh diff --git a/scripts/syscallhdr.sh b/scripts/syscallhdr.sh new file mode 100644 index 0000000..d03fe3d --- /dev/null +++ b/scripts/syscallhdr.sh @@ -0,0 +1,37 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 + +in="$1" +out="$2" +my_abis=`echo "($3)" | tr ',' '|'` +prefix="$4" +offset="$5" + +fileguard=_UAPI_ASM_`basename "$out" | sed \ + -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/' \ + -e 's/[^A-Z0-9_]/_/g' -e 's/__/_/g'` +grep -E "^[0-9A-Fa-fXx]+[[:space:]]+${my_abis}" "$in" | sort -n | ( + printf "#ifndef %s\n" "${fileguard}" + printf "#define %s\n" "${fileguard}" + printf "\n" + + nxt=0 + while read nr abi name entry compat ; do + if [ -z "$offset" ]; then + printf "#define __NR_%s%s\t%s\n" \ + "${prefix}" "${name}" "${nr}" + else + printf "#define __NR_%s%s\t(%s + %s)\n" \ + "${prefix}" "${name}" "${offset}" "${nr}" + fi + nxt=$((nr+1)) + done + + printf "\n" + printf "#ifdef __KERNEL__\n" + printf "#define __NR_syscalls\t%s\n" "${nxt}" + printf "#endif\n" + printf "\n" + printf "#endif /* %s */" "${fileguard}" + printf "\n" +) > "$out" diff --git a/scripts/syscallnr.sh b/scripts/syscallnr.sh new file mode 100644 index 0000000..8cf33fa --- /dev/null +++ b/scripts/syscallnr.sh @@ -0,0 +1,32 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 + +in="$1" +out="$2" +my_abis=`echo "($3)" | tr ',' '|'` +prefix="$4" +offset="$5" + +fileguard=_UAPI_ASM_`basename "$out" | sed \ + -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/' \ + -e 's/[^A-Z0-9_]/_/g' -e 's/__/_/g'` +grep -E "^[0-9A-Fa-fXx]+[[:space:]]+${my_abis}" "$in" | sort -n | ( + printf "#ifndef %s\n" "${fileguard}" + printf "#define %s\n" "${fileguard}" + printf "\n" + + nxt=0 + while read nr abi name entry compat ; do + nxt=$((nr+1)) + done + + if [ ! -z "$prefix" ]; then + printf "#define __NR_%s_Linux_syscalls\t%s\n" "${prefix}" "${nxt}" + if [ ! -z "$offset" ]; then + printf "#define __NR_%s_Linux\t%s\n" "${prefix}" "${offset}" + fi + fi + printf "\n" + printf "#endif /* %s */" "${fileguard}" + printf "\n" +) > "$out" diff --git a/scripts/syscalltbl.sh b/scripts/syscalltbl.sh new file mode 100644 index 0000000..f60f762 --- /dev/null +++ b/scripts/syscalltbl.sh @@ -0,0 +1,37 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 + +in="$1" +out="$2" +my_abis=`echo "($3)" | tr ',' '|'` +my_abi="$4" +offset="$5" + +emit() { + t_nxt="$1" + t_nr="$2" + t_entry="$3" + + while [ $t_nxt -lt $t_nr ]; do + printf "__SYSCALL(%s,sys_ni_syscall)\n" "${t_nxt}" + t_nxt=$((t_nxt+1)) + done + printf "__SYSCALL(%s,%s)\n" "${t_nxt}" "${t_entry}" +} + +grep -E "^[0-9A-Fa-fXx]+[[:space:]]+${my_abis}" "$in" | sort -n | ( + nxt=0 + if [ -z "$offset" ]; then + offset=0 + fi + + while read nr abi name entry compat ; do + if [ "$my_abi" = "c32" -o "$my_abi" = "64_o32" ] && + [ ! -z "$compat" ]; then + emit $((nxt+offset)) $((nr+offset)) $compat + else + emit $((nxt+offset)) $((nr+offset)) $entry + fi + nxt=$((nr+1)) + done +) > "$out" -- 1.9.1

6 years, 8 months

[PATCH 0/2] m68k: Unify the system call scripts

by Firoz Khan

6 years, 8 months

[PATCH 0/2] ia64: Unify the system call scripts

by Firoz Khan

6 years, 8 months

[PATCH 0/2] microblaze: Unify the system call scripts

by Firoz Khan

6 years, 8 months

[PATCH 0/2] alpha: Unify the system call scripts

by Firoz Khan

6 years, 8 months

[PATCH v3] sock: Make sock->sk_stamp thread-safe

by Deepa Dinamani

Al Viro mentioned (Message-ID <20170626041334.GZ10672(a)ZenIV.linux.org.uk>) that there is probably a race condition lurking in accesses of sk_stamp on 32-bit machines. sock->sk_stamp is of type ktime_t which is always an s64. On a 32 bit architecture, we might run into situations of unsafe access as the access to the field becomes non atomic. Use seqlocks for synchronization. This allows us to avoid using spinlocks for readers as readers do not need mutual exclusion. Another approach to solve this is to require sk_lock for all modifications of the timestamps. The current approach allows for timestamps to have their own lock: sk_stamp_lock. This allows for the patch to not compete with already existing critical sections, and side effects are limited to the paths in the patch. The addition of the new field maintains the data locality optimizations from commit 9115e8cd2a0c ("net: reorganize struct sock for better data locality") Note that all the instances of the sk_stamp accesses are either through the ioctl or the syscall recvmsg. Signed-off-by: Deepa Dinamani <deepa.kernel(a)gmail.com> --- Changes since v2: * added ifdef as per eric's request Changes since v1: * fixed sunrpc sk_stamp update include/net/sock.h | 38 +++++++++++++++++++++++++++++++++++--- net/compat.c | 15 +++++++++------ net/core/sock.c | 15 ++++++++++----- net/sunrpc/svcsock.c | 2 +- 4 files changed, 55 insertions(+), 15 deletions(-) diff --git a/include/net/sock.h b/include/net/sock.h index f665d74ae509..e144c071c93f 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -298,6 +298,7 @@ struct sock_common { * @sk_filter: socket filtering instructions * @sk_timer: sock cleanup timer * @sk_stamp: time stamp of last packet received + * @sk_stamp_seq: lock for accessing sk_stamp on 32 bit architectures only * @sk_tsflags: SO_TIMESTAMPING socket options * @sk_tskey: counter to disambiguate concurrent tstamp requests * @sk_zckey: counter to order MSG_ZEROCOPY notifications @@ -474,6 +475,9 @@ struct sock { const struct cred *sk_peer_cred; long sk_rcvtimeo; ktime_t sk_stamp; +#if BITS_PER_LONG==32 + seqlock_t sk_stamp_seq; +#endif u16 sk_tsflags; u8 sk_shutdown; u32 sk_tskey; @@ -2287,6 +2291,34 @@ static inline void sk_drops_add(struct sock *sk, const struct sk_buff *skb) atomic_add(segs, &sk->sk_drops); } +static inline ktime_t sock_read_timestamp(struct sock *sk) +{ +#if BITS_PER_LONG==32 + unsigned int seq; + ktime_t kt; + + do { + seq = read_seqbegin(&sk->sk_stamp_seq); + kt = sk->sk_stamp; + } while (read_seqretry(&sk->sk_stamp_seq, seq)); + + return kt; +#else + return sk->sk_stamp; +#endif +} + +static inline void sock_write_timestamp(struct sock *sk, ktime_t kt) +{ +#if BITS_PER_LONG==32 + write_seqlock(&sk->sk_stamp_seq); + sk->sk_stamp = kt; + write_sequnlock(&sk->sk_stamp_seq); +#else + sk->sk_stamp = kt; +#endif +} + void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb); void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, @@ -2311,7 +2343,7 @@ sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE))) __sock_recv_timestamp(msg, sk, skb); else - sk->sk_stamp = kt; + sock_write_timestamp(sk, kt); if (sock_flag(sk, SOCK_WIFI_STATUS) && skb->wifi_acked_valid) __sock_recv_wifi_status(msg, sk, skb); @@ -2332,9 +2364,9 @@ static inline void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, if (sk->sk_flags & FLAGS_TS_OR_DROPS || sk->sk_tsflags & TSFLAGS_ANY) __sock_recv_ts_and_drops(msg, sk, skb); else if (unlikely(sock_flag(sk, SOCK_TIMESTAMP))) - sk->sk_stamp = skb->tstamp; + sock_write_timestamp(sk, skb->tstamp); else if (unlikely(sk->sk_stamp == SK_DEFAULT_STAMP)) - sk->sk_stamp = 0; + sock_write_timestamp(sk, 0); } void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags); diff --git a/net/compat.c b/net/compat.c index 47a614b370cd..d1f3a8a0b3ef 100644 --- a/net/compat.c +++ b/net/compat.c @@ -467,12 +467,14 @@ int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) ctv = (struct compat_timeval __user *) userstamp; err = -ENOENT; sock_enable_timestamp(sk, SOCK_TIMESTAMP); - tv = ktime_to_timeval(sk->sk_stamp); + tv = ktime_to_timeval(sock_read_timestamp(sk)); + if (tv.tv_sec == -1) return err; if (tv.tv_sec == 0) { - sk->sk_stamp = ktime_get_real(); - tv = ktime_to_timeval(sk->sk_stamp); + ktime_t kt = ktime_get_real(); + sock_write_timestamp(sk, kt); + tv = ktime_to_timeval(kt); } err = 0; if (put_user(tv.tv_sec, &ctv->tv_sec) || @@ -494,12 +496,13 @@ int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *usersta ctv = (struct compat_timespec __user *) userstamp; err = -ENOENT; sock_enable_timestamp(sk, SOCK_TIMESTAMP); - ts = ktime_to_timespec(sk->sk_stamp); + ts = ktime_to_timespec(sock_read_timestamp(sk)); if (ts.tv_sec == -1) return err; if (ts.tv_sec == 0) { - sk->sk_stamp = ktime_get_real(); - ts = ktime_to_timespec(sk->sk_stamp); + ktime_t kt = ktime_get_real(); + sock_write_timestamp(sk, kt); + ts = ktime_to_timespec(kt); } err = 0; if (put_user(ts.tv_sec, &ctv->tv_sec) || diff --git a/net/core/sock.c b/net/core/sock.c index 6d7e189e3cd9..8236b28611c5 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -2747,6 +2747,9 @@ void sock_init_data(struct socket *sock, struct sock *sk) sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; sk->sk_stamp = SK_DEFAULT_STAMP; +#if BITS_PER_LONG==32 + seqlock_init(&sk->sk_stamp_seq); +#endif atomic_set(&sk->sk_zckey, 0); #ifdef CONFIG_NET_RX_BUSY_POLL @@ -2846,12 +2849,13 @@ int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) struct timeval tv; sock_enable_timestamp(sk, SOCK_TIMESTAMP); - tv = ktime_to_timeval(sk->sk_stamp); + tv = ktime_to_timeval(sock_read_timestamp(sk)); if (tv.tv_sec == -1) return -ENOENT; if (tv.tv_sec == 0) { - sk->sk_stamp = ktime_get_real(); - tv = ktime_to_timeval(sk->sk_stamp); + ktime_t kt = ktime_get_real(); + sock_write_timestamp(sk, kt); + tv = ktime_to_timeval(kt); } return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; } @@ -2862,11 +2866,12 @@ int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) struct timespec ts; sock_enable_timestamp(sk, SOCK_TIMESTAMP); - ts = ktime_to_timespec(sk->sk_stamp); + ts = ktime_to_timespec(sock_read_timestamp(sk)); if (ts.tv_sec == -1) return -ENOENT; if (ts.tv_sec == 0) { - sk->sk_stamp = ktime_get_real(); + ktime_t kt = ktime_get_real(); + sock_write_timestamp(sk, kt); ts = ktime_to_timespec(sk->sk_stamp); } return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c index 986f3ed7d1a2..b7e67310ec37 100644 --- a/net/sunrpc/svcsock.c +++ b/net/sunrpc/svcsock.c @@ -549,7 +549,7 @@ static int svc_udp_recvfrom(struct svc_rqst *rqstp) /* Don't enable netstamp, sunrpc doesn't need that much accuracy */ } - svsk->sk_sk->sk_stamp = skb->tstamp; + sock_write_timestamp(svsk->sk_sk, skb->tstamp); set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ len = skb->len; -- 2.17.1

6 years, 8 months

[GIT PULL] y2038: more syscalls and cleanups

by Arnd Bergmann

Hi Linus and Thomas, I realized that the merge window is now imminent, but I had not sent a pull request to Thomas for the current y2038 stuff. These patches have been around for a while though, and were in linux-next through my tree. I got one bug report on Monday and incorporated a simple fix, which changed the commit date for the second half of the series, in case you are wondering. Thomas, is it ok for you to just provide an Ack for this branch and have Linus merge it directly? Arnd The following changes since commit 651022382c7f8da46cb4872a545ee1da6d097d2a: Linux 4.20-rc1 (2018-11-04 15:37:52 -0800) are available in the Git repository at: https://git.kernel.org:/pub/scm/linux/kernel/git/arnd/playground.git tags/y2038-for-4.21 for you to fetch changes up to e4b92b108c6cd6b311e4b6e85d6a87a34599a6e3: timekeeping: remove obsolete time accessors (2018-12-18 16:13:05 +0100) ---------------------------------------------------------------- y2038: more syscalls and cleanups This concludes the main part of the system call rework for 64-bit time_t, which has spread over most of year 2018, the last six system calls being - ppoll - pselect6 - io_pgetevents - recvmmsg - futex - rt_sigtimedwait As before, nothing changes for 64-bit architectures, while 32-bit architectures gain another entry point that differs only in the layout of the timespec structure. Hopefully in the next release we can wire up all 22 of those system calls on all 32-bit architectures, which gives us a baseline version for glibc to start using them. This does not include the clock_adjtime, getrusage/waitid, and getitimer/setitimer system calls. I still plan to have new versions of those as well, but they are not required for correct operation of the C library since they can be emulated using the old 32-bit time_t based system calls. Aside from the system calls, there are also a few cleanups here, removing old kernel internal interfaces that have become unused after all references got removed. The arch/sh cleanups are part of this, there were posted several times over the past year without a reaction from the maintainers, while the corresponding changes made it into all other architectures. ---------------------------------------------------------------- Arnd Bergmann (13): y2038: futex: Move compat implementation into futex.c y2038: futex: Add support for __kernel_timespec y2038: socket: Add compat_sys_recvmmsg_time64 y2038: signal: Add sys_rt_sigtimedwait_time32 y2038: signal: Add compat_sys_rt_sigtimedwait_time64 sh: dreamcast: rtc: push down rtc class ops into driver sh: sh03: rtc: push down rtc class ops into driver sh: remove unused rtc_sh_get/set_time infrastructure sh: remove board_time_init() callback timekeeping: remove unused {read,update}_persistent_clock timekeeping: remove timespec_add/timespec_del vfs: replace current_kernel_time64 with ktime equivalent timekeeping: remove obsolete time accessors Deepa Dinamani (5): signal: Add set_user_sigmask() signal: Add restore_user_sigmask() ppoll: use __kernel_timespec pselect6: use __kernel_timespec io_pgetevents: use __kernel_timespec Documentation/sh/new-machine.txt | 8 -- arch/sh/boards/mach-dreamcast/Makefile | 4 +- arch/sh/boards/mach-dreamcast/rtc.c | 45 +++++++--- arch/sh/boards/mach-dreamcast/setup.c | 1 - arch/sh/boards/mach-sh03/Makefile | 3 +- arch/sh/boards/mach-sh03/rtc.c | 51 ++++++----- arch/sh/boards/mach-sh03/setup.c | 9 -- arch/sh/boards/of-generic.c | 8 -- arch/sh/configs/dreamcast_defconfig | 2 + arch/sh/configs/sh03_defconfig | 2 + arch/sh/include/asm/rtc.h | 3 - arch/sh/include/mach-dreamcast/mach/sysasic.h | 1 - arch/sh/kernel/time.c | 74 +--------------- fs/aio.c | 134 ++++++++++++++++++++--------- fs/eventpoll.c | 52 ++---------- fs/inode.c | 4 +- fs/select.c | 360 +++++++++++++++++++++++++++++++++++++++++++++--------------------------------- include/linux/compat.h | 26 ++++++ include/linux/futex.h | 8 -- include/linux/signal.h | 4 + include/linux/socket.h | 9 +- include/linux/syscalls.h | 29 +++++-- include/linux/time32.h | 25 ------ include/linux/timekeeping.h | 14 --- include/linux/timekeeping32.h | 15 ---- kernel/Makefile | 3 - kernel/futex.c | 207 +++++++++++++++++++++++++++++++++++++++++++-- kernel/futex_compat.c | 202 -------------------------------------------- kernel/signal.c | 143 +++++++++++++++++++++++++++++++ kernel/sys_ni.c | 2 + kernel/time/ntp.c | 10 +-- kernel/time/time.c | 36 -------- kernel/time/timekeeping.c | 12 +-- net/compat.c | 34 +++----- net/socket.c | 62 ++++++++++---- 35 files changed, 847 insertions(+), 755 deletions(-) delete mode 100644 kernel/futex_compat.c

6 years, 8 months

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