mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-28 05:21:13 +00:00
d82468d100
The recent fexecve changes broke the build on (at least) alpha (maybe
other configurations, that was the first breakage I saw in my
build-many-glibcs.py run):
In file included from ../sysdeps/unix/sysv/linux/alpha/sysdep.h:29:0,
from ../sysdeps/alpha/nptl/tls.h:31,
from ../include/errno.h:25,
from ../sysdeps/unix/sysv/linux/fexecve.c:18:
../sysdeps/unix/sysv/linux/fexecve.c: In function 'fexecve':
../sysdeps/unix/alpha/sysdep.h:203:10: error: 'sizeof' on array function parameter 'argv' will return size of 'char * const*' [-Werror=sizeof-array-argument]
(sizeof(arg) == 4 ? (long)(int)(long)(arg) : (long)(arg))
^
../sysdeps/unix/alpha/sysdep.h:302:26: note: in expansion of macro 'syscall_promote'
register long _tmp_18 = syscall_promote (arg3); \
^~~~~~~~~~~~~~~
../sysdeps/unix/alpha/sysdep.h:173:2: note: in expansion of macro 'inline_syscall5'
inline_syscall##nr(__NR_##name, args); \
^~~~~~~~~~~~~~
../sysdeps/unix/sysv/linux/alpha/sysdep.h:85:2: note: in expansion of macro 'INLINE_SYSCALL1'
INLINE_SYSCALL1(name, nr, args); \
^~~~~~~~~~~~~~~
../sysdeps/unix/sysv/linux/fexecve.c:42:3: note: in expansion of macro 'INLINE_SYSCALL'
INLINE_SYSCALL (execveat, 5, fd, "", argv, envp, AT_EMPTY_PATH);
^~~~~~~~~~~~~~
../sysdeps/unix/sysv/linux/fexecve.c:33:30: note: declared here
fexecve (int fd, char *const argv[], char *const envp[])
^~~~
This patch fixes this similarly to previous fixes for such issues: use
&argv[0] and &envp[0] as the syscall macro arguments. Tested
(compilation only) for alpha-linux-gnu with build-many-glibcs.py.
* sysdeps/unix/sysv/linux/fexecve.c (fexecve) [__NR_execveat]:
Explicitly take address of first element of array arguments in
call to INLINE_SYSCALL.
72 lines
2.1 KiB
C
72 lines
2.1 KiB
C
/* Copyright (C) 1994-2017 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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <stddef.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <sysdep.h>
|
|
#include <sys/syscall.h>
|
|
#include <kernel-features.h>
|
|
|
|
|
|
/* Execute the file FD refers to, overlaying the running program image.
|
|
ARGV and ENVP are passed to the new program, as for `execve'. */
|
|
int
|
|
fexecve (int fd, char *const argv[], char *const envp[])
|
|
{
|
|
if (fd < 0 || argv == NULL || envp == NULL)
|
|
{
|
|
__set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
|
|
#ifdef __NR_execveat
|
|
/* Avoid implicit array coercion in syscall macros. */
|
|
INLINE_SYSCALL (execveat, 5, fd, "", &argv[0], &envp[0], AT_EMPTY_PATH);
|
|
# ifndef __ASSUME_EXECVEAT
|
|
if (errno != ENOSYS)
|
|
return -1;
|
|
# endif
|
|
#endif
|
|
|
|
#ifndef __ASSUME_EXECVEAT
|
|
/* We use the /proc filesystem to get the information. If it is not
|
|
mounted we fail. */
|
|
char buf[sizeof "/proc/self/fd/" + sizeof (int) * 3];
|
|
__snprintf (buf, sizeof (buf), "/proc/self/fd/%d", fd);
|
|
|
|
/* We do not need the return value. */
|
|
__execve (buf, argv, envp);
|
|
|
|
int save = errno;
|
|
|
|
/* We come here only if the 'execve' call fails. Determine whether
|
|
/proc is mounted. If not we return ENOSYS. */
|
|
struct stat st;
|
|
if (stat ("/proc/self/fd", &st) != 0 && errno == ENOENT)
|
|
save = ENOSYS;
|
|
|
|
__set_errno (save);
|
|
#endif
|
|
|
|
return -1;
|
|
}
|