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linux: Add process_mrelease

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Added in Linux 5.15 (884a7e5964e06ed93c7771c0d7cf19c09a8946f1), the new
syscalls allows a caller to free the memory of a dying target process.

Checked on x86_64-linux-gnu.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Adhemerval Zanella 2022-01-28 12:53:52 +00:00
parent d19ee3473d
commit 1002f1af1c
39 changed files with 129 additions and 0 deletions
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5
NEWS
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@ -24,6 +24,11 @@ Major new features:
same functionality as madvise but alters the target process identified
by the pidfd.
* On Linux, the process_mrelease function has been added. It allows a
caller to release the memory of a dying process. The release of the
memory is carried out in the context of the caller, using the caller's
CPU affinity, and priority with CPU usage accounted to the caller.
Deprecated and removed features, and other changes affecting compatibility:
* Support for prelink will be removed in the next release; this includes

1
sysdeps/unix/sysv/linux/Makefile
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@ -129,6 +129,7 @@ tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
tst-epoll \
tst-getauxval \
tst-pidfd \
tst-process_mrelease \
# tests
# process_madvise requires CAP_SYS_ADMIN.

1
sysdeps/unix/sysv/linux/Versions
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@ -304,6 +304,7 @@ libc {
pidfd_getfd;
pidfd_send_signal;
process_madvise;
process_mrelease;
}
GLIBC_PRIVATE {
# functions used in other libraries

1
sysdeps/unix/sysv/linux/aarch64/libc.abilist
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@ -2620,3 +2620,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease F

1
sysdeps/unix/sysv/linux/alpha/libc.abilist
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@ -2717,6 +2717,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease 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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@ -2381,3 +2381,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease F

1
sysdeps/unix/sysv/linux/arm/be/libc.abilist
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@ -500,6 +500,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease 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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@ -497,6 +497,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease F
GLIBC_2.4 _Exit F
GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
GLIBC_2.4 _IO_2_1_stdin_ D 0xa0

2
sysdeps/unix/sysv/linux/bits/mman_ext.h
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@ -30,4 +30,6 @@ extern __ssize_t process_madvise (int __pid_fd, const struct iovec* __iov,
unsigned __flags)
__THROW;
extern int process_mrelease (int pidfd, unsigned int flags) __THROW;
#endif /* __USE_GNU */

1
sysdeps/unix/sysv/linux/csky/libc.abilist
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@ -2656,3 +2656,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease F

1
sysdeps/unix/sysv/linux/hppa/libc.abilist
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@ -2605,6 +2605,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease 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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@ -2789,6 +2789,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease 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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@ -2555,6 +2555,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease 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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@ -501,6 +501,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease 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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@ -2732,6 +2732,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease 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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@ -2705,3 +2705,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease F

1
sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
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@ -2702,3 +2702,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease F

1
sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
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@ -2697,6 +2697,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease 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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@ -2695,6 +2695,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease 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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@ -2703,6 +2703,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease 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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@ -2606,6 +2606,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease 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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@ -2744,3 +2744,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease F

1
sysdeps/unix/sysv/linux/or1k/libc.abilist
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@ -2127,3 +2127,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease F

1
sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
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@ -2759,6 +2759,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease 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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@ -2792,6 +2792,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease 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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@ -2514,6 +2514,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease 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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@ -2816,3 +2816,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease F

1
sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
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@ -2383,3 +2383,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease F

1
sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
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@ -2583,3 +2583,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease F

1
sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
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@ -2757,6 +2757,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease 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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@ -2551,6 +2551,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease 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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@ -2612,6 +2612,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease 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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@ -2609,6 +2609,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease 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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@ -2752,6 +2752,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease 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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@ -2578,6 +2578,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease 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/syscalls.list
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@ -44,6 +44,7 @@ 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
process_madvise EXTRA process_madvise i:iPniU process_madvise
process_mrelease EXTRA process_mrelease i:iU process_mrelease
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

86
sysdeps/unix/sysv/linux/tst-process_mrelease.c Normal file
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@ -0,0 +1,86 @@
/* Basic tests for Linux process_mrelease.
Copyright (C) 2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <stdlib.h>
#include <support/check.h>
#include <support/support.h>
#include <support/xsocket.h>
#include <support/xunistd.h>
#include <sys/mman.h>
#include <sys/pidfd.h>
#include <sys/wait.h>
static void
exit_subprocess (int dummy)
{
exit (EXIT_FAILURE);
}
static void
subprocess (void)
{
/* In case something goes wrong with parent before pidfd_send_signal. */
support_create_timer (5, 0, false, exit_subprocess);
pause ();
_exit (0);
}
static int
do_test (void)
{
{
int r = process_mrelease (-1, 0);
TEST_COMPARE (r, -1);
if (errno == ENOSYS)
FAIL_UNSUPPORTED ("kernel does not support process_mrelease, "
"skipping test");
TEST_COMPARE (errno, EBADF);
}
pid_t pid = xfork ();
if (pid == 0)
subprocess ();
int pidfd = pidfd_open (pid, 0);
TEST_VERIFY (pidfd != -1);
/* The syscall only succeedes if the target process is exiting and there
is no guarantee that calling if after pidfd_send_signal will not error
(ince the process might have already been reaped by the OS). So just
check if it does fail when the process is stll running. */
TEST_COMPARE (process_mrelease (pidfd, 0), -1);
TEST_COMPARE (errno, EINVAL);
TEST_COMPARE (pidfd_send_signal (pidfd, SIGKILL, NULL, 0), 0);
{
siginfo_t info;
int r = waitid (P_PIDFD, pidfd, &info, WEXITED);
TEST_COMPARE (r, 0);
TEST_COMPARE (info.si_status, SIGKILL);
TEST_COMPARE (info.si_code, CLD_KILLED);
}
TEST_COMPARE (pidfd_send_signal (pidfd, SIGKILL, NULL, 0), -1);
TEST_COMPARE (errno, ESRCH);
return 0;
}
#include <support/test-driver.c>

1
sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
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@ -2529,6 +2529,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease 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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@ -2635,3 +2635,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
GLIBC_2.36 process_mrelease F