mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-07-01 00:38:31 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Add fexecve() and map O_EXEC to O_PATH on Linux

Browse source
This commit is contained in:
Justine Tunney 2022-10-02 08:30:39 -07:00
parent 6c60793f3a
commit acd8900071
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
9 changed files with 161 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

78
libc/calls/fexecve.c Normal file
View file

@ -0,0 +1,78 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/dce.h"
#include "libc/fmt/itoa.h"
#include "libc/intrin/asan.internal.h"
#include "libc/intrin/kprintf.h"
#include "libc/intrin/likely.h"
#include "libc/intrin/strace.internal.h"
#include "libc/str/str.h"
#include "libc/sysv/errfuns.h"
int sys_fexecve(int, char *const[], char *const[]);
/**
* Executes binary executable at file descriptor.
*
* This is only supported on Linux and FreeBSD. APE binaries currently
* aren't supported.
*
* @param fd is opened executable and current file position is ignored
* @return doesn't return on success, otherwise -1 w/ errno
* @raise ENOEXEC if file at `fd` isn't an assimilated ELF executable
* @raise ENOSYS on Windows, XNU, OpenBSD, NetBSD, and Metal
*/
int fexecve(int fd, char *const argv[], char *const envp[]) {
int rc;
size_t i;
if (!argv || !envp ||
(IsAsan() &&
(!__asan_is_valid_strlist(argv) || !__asan_is_valid_strlist(envp)))) {
rc = efault();
} else {
#ifdef SYSDEBUG
if (UNLIKELY(__strace > 0)) {
kprintf(STRACE_PROLOGUE "fexecve(%d, {", fd);
for (i = 0; argv[i]; ++i) {
if (i) kprintf(", ");
kprintf("%#s", argv[i]);
}
kprintf("}, {");
for (i = 0; envp[i]; ++i) {
if (i) kprintf(", ");
kprintf("%#s", envp[i]);
}
kprintf("})\n");
}
#endif
if (IsLinux()) {
char path[14 + 12];
FormatInt32(stpcpy(path, "/proc/self/fd/"), fd);
rc = __sys_execve(path, argv, envp);
} else if (IsFreebsd()) {
rc = sys_fexecve(fd, argv, envp);
} else {
rc = enosys();
}
}
STRACE("fexecve(%d) failed %d% m", fd, rc);
return rc;
}