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linux: Add PR_SET_VMA_ANON_NAME support
Linux 5.17 added support to naming anonymous virtual memory areas through the prctl syscall. The __set_vma_name is a wrapper to avoid optimizing the prctl call if the kernel does not support it. If the kernel does not support PR_SET_VMA_ANON_NAME, prctl returns EINVAL. And it also returns the same error for an invalid argument. Since it is an internal-only API, it assumes well-formatted input: aligned START, with (START, START+LEN) being a valid memory range, and NAME with a limit of 80 characters without an invalid one ("\\`$[]"). Reviewed-by: DJ Delorie <dj@redhat.com>
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@ -3,6 +3,11 @@
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# ifndef _ISOMAC
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# ifndef PR_SET_VMA
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# define PR_SET_VMA 0x53564d41
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# define PR_SET_VMA_ANON_NAME 0
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# endif
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extern int __prctl (int __option, ...);
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libc_hidden_proto (__prctl)
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27
sysdeps/generic/setvmaname.h
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27
sysdeps/generic/setvmaname.h
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@ -0,0 +1,27 @@
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/* Utilities functions to name memory mappings.
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Copyright (C) 2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef __SETVMANAME_H
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#define __SETVMANAME_H
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static inline
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void __set_vma_name (void *start, size_t len, const char *name)
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{
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}
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#endif
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@ -97,6 +97,7 @@ sysdep_routines += \
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readahead \
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setfsgid \
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setfsuid \
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setvmaname \
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signalfd \
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splice \
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sysctl \
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44
sysdeps/unix/sysv/linux/setvmaname.c
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44
sysdeps/unix/sysv/linux/setvmaname.c
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@ -0,0 +1,44 @@
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/* Utilities functions to name memory mappings.
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Copyright (C) 2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <ldsodefs.h>
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#include <setvmaname.h>
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#include <sys/prctl.h>
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#include <sysdep.h>
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/* If PR_SET_VMA_ANON_NAME is not supported by the kernel, prctl returns
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EINVAL. However, it also returns the same error for invalid argument.
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Since it is an internal-only API, it assumes well formatted input:
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aligned START, with (START, START+LEN) being a valid memory range,
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and NAME with a limit of 80 characters without invalid one ("\\`$[]"). */
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void
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__set_vma_name (void *start, size_t len, const char *name)
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{
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static int prctl_supported = 1;
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if (atomic_load_relaxed (&prctl_supported) == 0)
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return;
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int r = INTERNAL_SYSCALL_CALL (prctl, PR_SET_VMA, PR_SET_VMA_ANON_NAME,
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start, len, name);
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if (r == 0 || r != -EINVAL)
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return;
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atomic_store_relaxed (&prctl_supported, 0);
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return;
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}
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36
sysdeps/unix/sysv/linux/setvmaname.h
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36
sysdeps/unix/sysv/linux/setvmaname.h
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@ -0,0 +1,36 @@
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/* Utilities functions to name memory mappings.
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Copyright (C) 2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef __SETVMANAME_H
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#define __SETVMANAME_H
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/* Set the NAME to the anonymous memory map START with size of LEN.
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It assumes well-formatted input. */
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#if IS_IN(libc) || IS_IN(rtld)
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void __set_vma_name (void *start, size_t len, const char *name)
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attribute_hidden;
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#else
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#include <sys/prctl.h>
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static inline void __set_vma_name (void *start, size_t len, const char *name)
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{
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prctl (PR_SET_VMA, PR_SET_VMA_ANON_NAME, start, len, name);
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}
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#endif
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#endif
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