linux: Add process_madvise

It was added on Linux 5.10 (ecb8ac8b1f146915aa6b96449b66dd48984caacc)
with the same functionality as madvise but using a pidfd of the target
process.

Checked on x86_64-linux-gnu and i686-linux-gnu.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

NEWS

@@ -20,6 +20,10 @@ Major new features:
   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 process_madvise function has been added. It has the
+  same functionality as madvise but alters the target process identified
+  by the pidfd.
+
 Deprecated and removed features, and other changes affecting compatibility:
 
 * Support for prelink will be removed in the next release; this includes

bits/mman_ext.h

@@ -0,0 +1,21 @@
+/* System-specific extensions of <sys/mman.h>, generic version.
+   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/>.  */
+
+#ifndef _SYS_MMAN_H
+# error "Never include <bits/mman_ext.h> directly; use <sys/mman.h> instead."
+#endif

misc/sys/mman.h

@@ -146,6 +146,9 @@ extern int shm_open (const char *__name, int __oflag, mode_t __mode);
 /* Remove shared memory segment.  */
 extern int shm_unlink (const char *__name);
 
+/* System-specific extensions.  */
+#include <bits/mman_ext.h>
+
 __END_DECLS
 
 #endif	/* sys/mman.h */

posix/Makefile

@@ -32,7 +32,7 @@ headers	:= sys/utsname.h sys/times.h sys/wait.h sys/types.h unistd.h	      \
 	   bits/waitflags.h bits/waitstatus.h sys/unistd.h sched.h	      \
 	   bits/sched.h bits/cpu-set.h re_comp.h wait.h bits/environments.h   \
 	   cpio.h spawn.h bits/unistd.h bits/types/struct_sched_param.h	      \
-	   bits/unistd_ext.h bits/types/idtype_t.h
+	   bits/unistd_ext.h bits/types/idtype_t.h bits/mman_ext.h
 
 routines :=								      \
 	uname								      \

sysdeps/unix/sysv/linux/Makefile

@@ -131,6 +131,11 @@ tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
   tst-pidfd \
   # tests
 
+# process_madvise requires CAP_SYS_ADMIN.
+xtests += \
+  tst-process_madvise \
+  # xtests
+
 # For +depfiles in Makerules.
 extra-test-objs += tst-sysconf-iov_max-uapi.o
 

sysdeps/unix/sysv/linux/Versions

@@ -303,6 +303,7 @@ libc {
     pidfd_open;
     pidfd_getfd;
     pidfd_send_signal;
+    process_madvise;
   }
   GLIBC_PRIVATE {
     # functions used in other libraries

sysdeps/unix/sysv/linux/aarch64/libc.abilist

@@ -2619,3 +2619,4 @@ 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_2.36 process_madvise F

sysdeps/unix/sysv/linux/alpha/libc.abilist

@@ -2716,6 +2716,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 _IO_fprintf F
 GLIBC_2.4 _IO_printf F
 GLIBC_2.4 _IO_sprintf F

sysdeps/unix/sysv/linux/arc/libc.abilist

@@ -2380,3 +2380,4 @@ 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_2.36 process_madvise F

sysdeps/unix/sysv/linux/arm/be/libc.abilist

@@ -499,6 +499,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 _Exit F
 GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
 GLIBC_2.4 _IO_2_1_stdin_ D 0xa0

sysdeps/unix/sysv/linux/arm/le/libc.abilist

@@ -496,6 +496,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 _Exit F
 GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
 GLIBC_2.4 _IO_2_1_stdin_ D 0xa0

sysdeps/unix/sysv/linux/bits/mman_ext.h

@@ -0,0 +1,33 @@
+/* System-specific extensions of <sys/mman.h>, Linux version.
+   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/>.  */
+
+#ifndef _SYS_MMAN_H
+# error "Never include <bits/mman_ext.h> directly; use <sys/mman.h> instead."
+#endif
+
+#ifdef __USE_GNU
+#include <bits/types/struct_iovec.h>
+
+/*
+ */
+extern __ssize_t process_madvise (int __pid_fd, const struct iovec* __iov,
+				  size_t __count, int __advice,
+				  unsigned __flags)
+  __THROW;
+
+#endif /* __USE_GNU  */

sysdeps/unix/sysv/linux/csky/libc.abilist

@@ -2655,3 +2655,4 @@ 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_2.36 process_madvise F

sysdeps/unix/sysv/linux/hppa/libc.abilist

@@ -2604,6 +2604,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F

sysdeps/unix/sysv/linux/i386/libc.abilist

@@ -2788,6 +2788,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F

sysdeps/unix/sysv/linux/ia64/libc.abilist

@@ -2554,6 +2554,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F

sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist

@@ -500,6 +500,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 _Exit F
 GLIBC_2.4 _IO_2_1_stderr_ D 0x98
 GLIBC_2.4 _IO_2_1_stdin_ D 0x98

sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist

@@ -2731,6 +2731,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F

sysdeps/unix/sysv/linux/microblaze/be/libc.abilist

@@ -2704,3 +2704,4 @@ 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_2.36 process_madvise F

sysdeps/unix/sysv/linux/microblaze/le/libc.abilist

@@ -2701,3 +2701,4 @@ 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_2.36 process_madvise F

sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist

@@ -2696,6 +2696,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F

sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist

@@ -2694,6 +2694,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F

sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist

@@ -2702,6 +2702,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F

sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist

@@ -2605,6 +2605,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F

sysdeps/unix/sysv/linux/nios2/libc.abilist

@@ -2743,3 +2743,4 @@ 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_2.36 process_madvise F

sysdeps/unix/sysv/linux/or1k/libc.abilist

@@ -2126,3 +2126,4 @@ GLIBC_2.35 wscanf F
 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

sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist

@@ -2758,6 +2758,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 _IO_fprintf F
 GLIBC_2.4 _IO_printf F
 GLIBC_2.4 _IO_sprintf F

sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist

@@ -2791,6 +2791,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 _IO_fprintf F
 GLIBC_2.4 _IO_printf F
 GLIBC_2.4 _IO_sprintf F

sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist

@@ -2513,6 +2513,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 _IO_fprintf F
 GLIBC_2.4 _IO_printf F
 GLIBC_2.4 _IO_sprintf F

sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist

@@ -2815,3 +2815,4 @@ 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_2.36 process_madvise F

sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist

@@ -2382,3 +2382,4 @@ 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_2.36 process_madvise F

sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist

@@ -2582,3 +2582,4 @@ 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_2.36 process_madvise F

sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist

@@ -2756,6 +2756,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 _IO_fprintf F
 GLIBC_2.4 _IO_printf F
 GLIBC_2.4 _IO_sprintf F

sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist

@@ -2550,6 +2550,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 _IO_fprintf F
 GLIBC_2.4 _IO_printf F
 GLIBC_2.4 _IO_sprintf F

sysdeps/unix/sysv/linux/sh/be/libc.abilist

@@ -2611,6 +2611,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F

sysdeps/unix/sysv/linux/sh/le/libc.abilist

@@ -2608,6 +2608,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F

sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist

@@ -2751,6 +2751,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 _IO_fprintf F
 GLIBC_2.4 _IO_printf F
 GLIBC_2.4 _IO_sprintf F

sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist

@@ -2577,6 +2577,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F

sysdeps/unix/sysv/linux/syscalls.list

@@ -43,6 +43,7 @@ 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
+process_madvise EXTRA   process_madvise i:iPniU process_madvise
 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

sysdeps/unix/sysv/linux/tst-process_madvise.c

@@ -0,0 +1,141 @@
+/* Basic tests for Linux process_madvise.
+   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 <array_length.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <support/check.h>
+#include <support/process_state.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>
+
+/* The pair of sockets used for coordination.  The subprocess uses
+   sockets[1].  */
+static int sockets[2];
+
+static long int page_size;
+
+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);
+
+  void *p1 = xmmap (NULL, page_size * 2, PROT_READ | PROT_WRITE,
+		    MAP_PRIVATE | MAP_ANONYMOUS, -1);
+
+  void *p2 = xmmap (NULL, page_size, PROT_READ | PROT_WRITE,
+		    MAP_PRIVATE | MAP_ANONYMOUS, -1);
+  xmunmap(p2, page_size);
+
+  xsendto (sockets[1], &(struct iovec) { p1, page_size * 2 },
+	   sizeof (struct iovec), 0, NULL, 0);
+
+  xsendto (sockets[1], &(struct iovec) { p2, page_size },
+	   sizeof (struct iovec), 0, NULL, 0);
+
+  pause ();
+
+  _exit (0);
+}
+
+static int
+do_test (void)
+{
+  page_size = sysconf (_SC_PAGE_SIZE);
+
+  {
+    int r = pidfd_open (-1, 0);
+    TEST_COMPARE (r, -1);
+    if (errno == ENOSYS)
+      FAIL_UNSUPPORTED ("kernel does not support pidfd_open, skipping test");
+
+    TEST_COMPARE (errno, EINVAL);
+  }
+
+  TEST_COMPARE (socketpair (AF_UNIX, SOCK_STREAM, 0, sockets), 0);
+
+  pid_t pid = xfork ();
+  if (pid == 0)
+    {
+      xclose (sockets[0]);
+      subprocess ();
+    }
+  xclose (sockets[1]);
+
+  int pidfd = pidfd_open (pid, 0);
+  TEST_VERIFY (pidfd != -1);
+
+  /* The target process is going to send us two iovec's.  The first one points
+     to a valid mapping, the other points to a previously valid mapping which
+     has now been unmapped.  */
+  {
+    struct iovec iv;
+    xrecvfrom (sockets[0], &iv, sizeof (iv), 0, NULL, 0);
+
+    /* We expect this to succeed in the target process because the mapping
+       is valid.  */
+    TEST_COMPARE (process_madvise (pidfd, &iv, 1, MADV_COLD, 0),
+		  2 * page_size);
+  }
+
+  {
+    struct iovec iv;
+    xrecvfrom (sockets[0], &iv, sizeof (iv), 0, NULL, 0);
+
+    /* We expect this to fail in the target process because the second iovec
+       points to an unmapped region.  The target process arranges for this to
+       be the case.  */
+    TEST_COMPARE (process_madvise (pidfd, &iv, 1, MADV_COLD, 0), -1);
+    TEST_COMPARE (errno, ENOMEM);
+  }
+
+  {
+    struct iovec iv[IOV_MAX + 1];
+    TEST_COMPARE (process_madvise (pidfd, iv, array_length (iv), MADV_COLD,
+				   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>

sysdeps/unix/sysv/linux/x86_64/64/libc.abilist

@@ -2528,6 +2528,7 @@ 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_2.36 process_madvise F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F

sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist

@@ -2634,3 +2634,4 @@ 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_2.36 process_madvise F