From 19d83270fcd993cc349570164e21b06d57036704 Mon Sep 17 00:00:00 2001 From: Alexandra Hájková Date: Mon, 3 May 2021 16:35:10 +0000 Subject: linux: Add execveat system call wrapper It operates similar to execve and it is is already used to implement fexecve without requiring /proc to be mounted. However, different than fexecve, if the syscall is not supported by the kernel an error is returned instead of trying a fallback. Checked on x86_64-linux-gnu and powerpc64le-linux-gnu. Reviewed-by: Adhemerval Zanella --- sysdeps/unix/sysv/linux/execveat.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/execveat.c (limited to 'sysdeps/unix/sysv/linux/execveat.c') diff --git a/sysdeps/unix/sysv/linux/execveat.c b/sysdeps/unix/sysv/linux/execveat.c new file mode 100644 index 0000000000..29ab81a464 --- /dev/null +++ b/sysdeps/unix/sysv/linux/execveat.c @@ -0,0 +1,32 @@ +/* Execute program relative to a directory file descriptor. + Copyright (C) 2021 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 + . */ + +#include +#include +#include + +/* Execute the file FD refers to, overlaying the running program image. + ARGV and ENVP are passed to the new program, as for 'execve'. */ +int +execveat (int dirfd, const char *path, char *const argv[], char *const envp[], + int flags) +{ + /* Avoid implicit array coercion in syscall macros. */ + return INLINE_SYSCALL_CALL (execveat, dirfd, path, &argv[0], &envp[0], + flags); +} -- cgit 1.4.1