mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-21 20:40:05 +00:00
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>
This commit is contained in:
parent
091ee2190d
commit
78ed8bdf4f
@ -3,6 +3,11 @@
|
||||
|
||||
# ifndef _ISOMAC
|
||||
|
||||
# ifndef PR_SET_VMA
|
||||
# define PR_SET_VMA 0x53564d41
|
||||
# define PR_SET_VMA_ANON_NAME 0
|
||||
# endif
|
||||
|
||||
extern int __prctl (int __option, ...);
|
||||
libc_hidden_proto (__prctl)
|
||||
|
||||
|
27
sysdeps/generic/setvmaname.h
Normal file
27
sysdeps/generic/setvmaname.h
Normal file
@ -0,0 +1,27 @@
|
||||
/* Utilities functions to name memory mappings.
|
||||
Copyright (C) 2023 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 __SETVMANAME_H
|
||||
#define __SETVMANAME_H
|
||||
|
||||
static inline
|
||||
void __set_vma_name (void *start, size_t len, const char *name)
|
||||
{
|
||||
}
|
||||
|
||||
#endif
|
@ -97,6 +97,7 @@ sysdep_routines += \
|
||||
readahead \
|
||||
setfsgid \
|
||||
setfsuid \
|
||||
setvmaname \
|
||||
signalfd \
|
||||
splice \
|
||||
sysctl \
|
||||
|
44
sysdeps/unix/sysv/linux/setvmaname.c
Normal file
44
sysdeps/unix/sysv/linux/setvmaname.c
Normal file
@ -0,0 +1,44 @@
|
||||
/* Utilities functions to name memory mappings.
|
||||
Copyright (C) 2023 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 <ldsodefs.h>
|
||||
#include <setvmaname.h>
|
||||
#include <sys/prctl.h>
|
||||
#include <sysdep.h>
|
||||
|
||||
/* If PR_SET_VMA_ANON_NAME is not supported by the kernel, prctl returns
|
||||
EINVAL. However, it also returns the same error for 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 invalid one ("\\`$[]"). */
|
||||
|
||||
void
|
||||
__set_vma_name (void *start, size_t len, const char *name)
|
||||
{
|
||||
static int prctl_supported = 1;
|
||||
if (atomic_load_relaxed (&prctl_supported) == 0)
|
||||
return;
|
||||
|
||||
int r = INTERNAL_SYSCALL_CALL (prctl, PR_SET_VMA, PR_SET_VMA_ANON_NAME,
|
||||
start, len, name);
|
||||
if (r == 0 || r != -EINVAL)
|
||||
return;
|
||||
|
||||
atomic_store_relaxed (&prctl_supported, 0);
|
||||
return;
|
||||
}
|
36
sysdeps/unix/sysv/linux/setvmaname.h
Normal file
36
sysdeps/unix/sysv/linux/setvmaname.h
Normal file
@ -0,0 +1,36 @@
|
||||
/* Utilities functions to name memory mappings.
|
||||
Copyright (C) 2023 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 __SETVMANAME_H
|
||||
#define __SETVMANAME_H
|
||||
|
||||
/* Set the NAME to the anonymous memory map START with size of LEN.
|
||||
It assumes well-formatted input. */
|
||||
#if IS_IN(libc) || IS_IN(rtld)
|
||||
void __set_vma_name (void *start, size_t len, const char *name)
|
||||
attribute_hidden;
|
||||
#else
|
||||
#include <sys/prctl.h>
|
||||
|
||||
static inline void __set_vma_name (void *start, size_t len, const char *name)
|
||||
{
|
||||
prctl (PR_SET_VMA, PR_SET_VMA_ANON_NAME, start, len, name);
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif
|
Loading…
Reference in New Issue
Block a user