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authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2018-06-06 14:07:34 -0300
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2018-06-08 17:27:46 -0300
commit283d98512272a12cb84e7798c23edbdf1adb287d (patch)
tree3691f644eb1109e70b48e97ac64314c9fdcedb7f /include
parent67c0579669ba1fc265d770252fab31babf887329 (diff)
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posix: Fix posix_spawnp to not execute invalid binaries in non compat mode (BZ#23264)
Current posix_spawnp implementation wrongly tries to execute invalid
binaries (for instance script without shebang) as a shell script in
non compat mode.  It was a regression introduced by
9ff72da471a509a8c19791efe469f47fa6977410 when __spawni started to use
__execvpe instead of __execve (glibc __execvpe try to execute ENOEXEC
as shell script regardless).

This patch fixes it by using an internal symbol (__execvpex) with the
faulty semantic (since compat mode is handled by spawni.c itself).

It was reported by Daniel Drake on libc-help [1].

Checked on x86_64-linux-gnu and i686-linux-gnu.

	[BZ #23264]
	* include/unistd.h (__execvpex): New prototype.
	* posix/Makefile (tests): Add tst-spawn4.
	(tests-internal): Add tst-spawn4-compat.
	* posix/execvpe.c (__execvpe_common, __execvpex): New functions.
	* posix/tst-spawn4-compat.c: New file.
	* posix/tst-spawn4.c: Likewise.
	* sysdeps/unix/sysv/linux/spawni.c (__spawni): Do not interpret invalid
	binaries as shell scripts.
	* sysdeps/posix/spawni.c (__spawni): Likewise.

[1] https://sourceware.org/ml/libc-help/2018-06/msg00012.html
Diffstat (limited to 'include')
-rw-r--r--include/unistd.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/unistd.h b/include/unistd.h
index 0f91b8babc..a171b00326 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -77,6 +77,8 @@ extern char *__getcwd (char *__buf, size_t __size) attribute_hidden;
 extern int __rmdir (const char *__path) attribute_hidden;
 extern int __execvpe (const char *file, char *const argv[],
 		      char *const envp[]) attribute_hidden;
+extern int __execvpex (const char *file, char *const argv[],
+		       char *const envp[]) attribute_hidden;
 
 /* Get the canonical absolute name of the named directory, and put it in SIZE
    bytes of BUF.  Returns NULL if the directory couldn't be determined or