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* [Bug libc/27053] New: Conformance regression in system(3) (and probably also pclose(3))
@ 2020-12-11 14:08 mtk.manpages at gmail dot com
2020-12-11 14:08 ` [Bug libc/27053] " mtk.manpages at gmail dot com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: mtk.manpages at gmail dot com @ 2020-12-11 14:08 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=27053
Bug ID: 27053
Summary: Conformance regression in system(3) (and probably also
pclose(3))
Product: glibc
Version: 2.33
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: libc
Assignee: unassigned at sourceware dot org
Reporter: mtk.manpages at gmail dot com
CC: drepper.fsp at gmail dot com
Target Milestone: ---
Created attachment 13037
--> https://sourceware.org/bugzilla/attachment.cgi?id=13037&action=edit
Test program to examine return value of system()
According to the POSIX specification of the system() function:
If some error prevents the command language
interpreter from executing after the child process is
created, the return value from system() shall be as if
the command language interpreter had terminated using
exit(127) or _exit(127).
Thus, for example, if no shell is present, or the shell pathname is not
executable, then the return value from system() should be as though the child
had done _exit(127).
This was once true in the glibc implementation, but is no longer true. I think
the change must have come in glibc 2.29, with
commit 5fb7fc96350575c9adb1316833e48ca11553be49
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Wed Oct 24 16:29:38 2018 -0300
posix: Use posix_spawn on system
That commit removed these lines from sysdeps/posix/system.c:
- /* Exec the shell. */
- (void) __execve (SHELL_PATH, (char *const *) new_argv, __environ);
- _exit (127);
I suspect, but have not tested, that a similar nonconformance to the spec has
been triggered in pclose() with the following commit:
commit 14d0e87d9b8caaa2eca7ca81f1189596671fe4fb
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Wed Sep 12 10:32:05 2018 -0300
posix: Use posix_spawn on popen
====
I've attached a test program. Here's a demo run:
$ ls -l /bin/sh
lrwxrwxrwx. 1 root root 4 Jul 27 15:18 /bin/sh -> bash
$ sudo chmod 0 /bin/bash
$ ./a.out date
system() returned: status=0xffffffff (-1,255)
system: Permission denied
The expected output when running the test program was:
system() returned: status=0x7f00 (127,0)
(Probably) could not invoke shell
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* [Bug libc/27053] Conformance regression in system(3) (and probably also pclose(3))
2020-12-11 14:08 [Bug libc/27053] New: Conformance regression in system(3) (and probably also pclose(3)) mtk.manpages at gmail dot com
@ 2020-12-11 14:08 ` mtk.manpages at gmail dot com
2020-12-11 14:27 ` adhemerval.zanella at linaro dot org
2021-01-11 16:44 ` adhemerval.zanella at linaro dot org
2 siblings, 0 replies; 4+ messages in thread
From: mtk.manpages at gmail dot com @ 2020-12-11 14:08 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=27053
Michael Kerrisk <mtk.manpages at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |adhemerval.zanella at linaro dot o
| |rg
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* [Bug libc/27053] Conformance regression in system(3) (and probably also pclose(3))
2020-12-11 14:08 [Bug libc/27053] New: Conformance regression in system(3) (and probably also pclose(3)) mtk.manpages at gmail dot com
2020-12-11 14:08 ` [Bug libc/27053] " mtk.manpages at gmail dot com
@ 2020-12-11 14:27 ` adhemerval.zanella at linaro dot org
2021-01-11 16:44 ` adhemerval.zanella at linaro dot org
2 siblings, 0 replies; 4+ messages in thread
From: adhemerval.zanella at linaro dot org @ 2020-12-11 14:27 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=27053
Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at sourceware dot org |adhemerval.zanella at linaro dot o
| |rg
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* [Bug libc/27053] Conformance regression in system(3) (and probably also pclose(3))
2020-12-11 14:08 [Bug libc/27053] New: Conformance regression in system(3) (and probably also pclose(3)) mtk.manpages at gmail dot com
2020-12-11 14:08 ` [Bug libc/27053] " mtk.manpages at gmail dot com
2020-12-11 14:27 ` adhemerval.zanella at linaro dot org
@ 2021-01-11 16:44 ` adhemerval.zanella at linaro dot org
2 siblings, 0 replies; 4+ messages in thread
From: adhemerval.zanella at linaro dot org @ 2021-01-11 16:44 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=27053
Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Target Milestone|--- |2.33
Status|UNCONFIRMED |RESOLVED
--- Comment #1 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
Fixed on 2.33.
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2020-12-11 14:08 [Bug libc/27053] New: Conformance regression in system(3) (and probably also pclose(3)) mtk.manpages at gmail dot com
2020-12-11 14:08 ` [Bug libc/27053] " mtk.manpages at gmail dot com
2020-12-11 14:27 ` adhemerval.zanella at linaro dot org
2021-01-11 16:44 ` adhemerval.zanella at linaro dot org
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