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linux: Add pidfd_send_signal

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This was added on Linux 5.1(3eb39f47934f9d5a3027fe00d906a45fe3a15fad)
as a way to avoid the race condition of using kill (where PID might be
reused by the kernel between between obtaining the pid and sending the
signal).

If the siginfo_t argument is NULL then pidfd_send_signal is equivalent
to kill.  If it is not NULL pidfd_send_signal is equivalent to
rt_sigqueueinfo.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Adhemerval Zanella 2022-01-28 17:13:41 -03:00
parent 32dd8c251a
commit 56cf9e8eec
37 changed files with 46 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
NEWS
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@ -16,9 +16,9 @@ Major new features:
-z pack-relative-relocs option, which is supported for some targets
in recent binutils versions. Lazy binding doesn't apply to DT_RELR.
* On Linux, the pidfd_open and pidfd_getfd functions have been added.
The pidfd functionality provides access to a process while avoiding
the issue of PID reuse on tranditional Unix systems.
* On Linux, the pidfd_open, pidfd_getfd, and pidfd_send_signal functions
have been added. The pidfd functionality provides access to a process
while avoiding the issue of PID reuse on tranditional Unix systems.
Deprecated and removed features, and other changes affecting compatibility:

1
sysdeps/unix/sysv/linux/Versions
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@ -302,6 +302,7 @@ libc {
GLIBC_2.36 {
pidfd_open;
pidfd_getfd;
pidfd_send_signal;
}
GLIBC_PRIVATE {
# functions used in other libraries

1
sysdeps/unix/sysv/linux/aarch64/libc.abilist
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@ -2618,3 +2618,4 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F

1
sysdeps/unix/sysv/linux/alpha/libc.abilist
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@ -2715,6 +2715,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F

1
sysdeps/unix/sysv/linux/arc/libc.abilist
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@ -2379,3 +2379,4 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F

1
sysdeps/unix/sysv/linux/arm/be/libc.abilist
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@ -498,6 +498,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 _Exit F
GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
GLIBC_2.4 _IO_2_1_stdin_ D 0xa0

1
sysdeps/unix/sysv/linux/arm/le/libc.abilist
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@ -495,6 +495,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 _Exit F
GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
GLIBC_2.4 _IO_2_1_stdin_ D 0xa0

1
sysdeps/unix/sysv/linux/csky/libc.abilist
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@ -2654,3 +2654,4 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F

1
sysdeps/unix/sysv/linux/hppa/libc.abilist
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@ -2603,6 +2603,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F

1
sysdeps/unix/sysv/linux/i386/libc.abilist
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@ -2787,6 +2787,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F

1
sysdeps/unix/sysv/linux/ia64/libc.abilist
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@ -2553,6 +2553,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F

1
sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
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@ -499,6 +499,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 _Exit F
GLIBC_2.4 _IO_2_1_stderr_ D 0x98
GLIBC_2.4 _IO_2_1_stdin_ D 0x98

1
sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
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@ -2730,6 +2730,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F

1
sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
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@ -2703,3 +2703,4 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F

1
sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
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@ -2700,3 +2700,4 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F

1
sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
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@ -2695,6 +2695,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F

1
sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
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@ -2693,6 +2693,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F

1
sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
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@ -2701,6 +2701,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F

1
sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
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@ -2604,6 +2604,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F

1
sysdeps/unix/sysv/linux/nios2/libc.abilist
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@ -2742,3 +2742,4 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F

1
sysdeps/unix/sysv/linux/or1k/libc.abilist
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@ -2125,3 +2125,4 @@ GLIBC_2.35 writev F
GLIBC_2.35 wscanf F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F

1
sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
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@ -2757,6 +2757,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F

1
sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
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@ -2790,6 +2790,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F

1
sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
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@ -2512,6 +2512,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F

1
sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
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@ -2814,3 +2814,4 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F

1
sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
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@ -2381,3 +2381,4 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F

1
sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
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@ -2581,3 +2581,4 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F

1
sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
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@ -2755,6 +2755,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F

1
sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
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@ -2549,6 +2549,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F

1
sysdeps/unix/sysv/linux/sh/be/libc.abilist
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@ -2610,6 +2610,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F

1
sysdeps/unix/sysv/linux/sh/le/libc.abilist
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@ -2607,6 +2607,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F

1
sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
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@ -2750,6 +2750,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F

1
sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
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@ -2576,6 +2576,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F

8
sysdeps/unix/sysv/linux/sys/pidfd.h
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@ -38,4 +38,12 @@ extern int pidfd_open (__pid_t __pid, unsigned int __flags) __THROW;
extern int pidfd_getfd (int __pidfd, int __targetfd,
unsigned int __flags) __THROW;
/* Sends the signal SIG to the target process referred by the PIDFD. If
INFO points to a siginfo_t buffer, it will be populated.
The FLAGS argument is reserved for future use, it must be specified
as 0. */
extern int pidfd_send_signal (int __pidfd, int __sig, siginfo_t *__info,
unsigned int __flags) __THROW;
#endif /* _PIDFD_H */

1
sysdeps/unix/sysv/linux/syscalls.list
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@ -42,6 +42,7 @@ pipe2 - pipe2 i:fi __pipe2 pipe2
pidfd_open EXTRA pidfd_open i:iU pidfd_open
pidfd_getfd EXTRA pidfd_getfd i:iiU pidfd_getfd
pivot_root EXTRA pivot_root i:ss pivot_root
pidfd_send_signal EXTRA pidfd_send_signal i:iiPU pidfd_send_signal
query_module EXTRA query_module i:sipip __compat_query_module query_module@GLIBC_2.0:GLIBC_2.23
quotactl EXTRA quotactl i:isip quotactl
remap_file_pages - remap_file_pages i:pUiUi __remap_file_pages remap_file_pages

1
sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
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@ -2527,6 +2527,7 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F

1
sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
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@ -2633,3 +2633,4 @@ GLIBC_2.35 epoll_pwait2 F
GLIBC_2.35 posix_spawn_file_actions_addtcsetpgrp_np F
GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F