Bugs item #1226969, was opened at 2005-06-24 15:05
Message generated for change (Comment added) made by loewis
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Category: Python Interpreter Core
Group: Python 2.4
>Status: Closed
>Resolution: Invalid
Priority: 5
Submitted By: jacobo_es (jacobo_es)
Assigned to: Nobody/Anonymous (nobody)
Summary: segfault in os module
Initial Comment:
python crashes when a bad parameters are passed to execl function
of the os module:
>>> import os
>>> os.execl("/bin/bash")
Segmentation Fault (core dumped)
No matter the platform (on ppc raises a bus error) and the version of
C compiler, always crashes, python versions used are 2.4.1 and
2.4c1.
Proved on MacOSX (ppc), and Knoppix, Red Hat Enterprise
and debian woody 3.0 (x86).
However, on 2.2.3 version not crashes.
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>Comment By: Martin v. Löwis (loewis)
Date: 2005-08-06 15:19
Message:
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There is nothing wrong with Python here. It is not Python
that crashes, but /bin/bash. Just try a different binary
(/usr/bin/id worked for me); use strace to see that it is
indeed the new process that crashes.
Closing as invalid.
----------------------------------------------------------------------
Comment By: Reinhold Birkenfeld (birkenfeld)
Date: 2005-06-26 08:19
Message:
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First, Python does not call the C execl functions, but
translates them to execv calls.
For execv called like Python does:
~/tmp> ./execv
zsh: 15395 segmentation fault ./execv
~/tmp> cat execv.c
#include <unistd.h>
#include <errno.h>
int main() {
const char* args[1];
args[0] = NULL;
execv("/bin/bash", args);
return errno;
}
For execl on the C layer, my Linux doesn't want that:
~/tmp> gcc -o execl execl.c
execl.c: In function `main':
execl.c:4: error: too few arguments to function 'execl'
~/tmp> cat execv.c
#include <unistd.h>
int main() {
execl("/bin/bash");
return 0;
}
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Comment By: jacobo_es (jacobo_es)
Date: 2005-06-26 01:15
Message:
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I tried this directly on the C layer, too, and not raises a
signal 11, segmentation fault, just the function execl()
isn't executed and the program flow goes, not raises a
sigsegv, and that's not happen in
the same way in python, that abort the python interpreter
and dump a core file.
-( tmp )- ./p
execl not executed.
-( tmp )- cat p.c
#include <stdio.h>
int main() {
execl("/bin/bash");
fprintf(stderr, "execl not executed.\n");
exit(-1);
}
----------------------------------------------------------------------
Comment By: Reinhold Birkenfeld (birkenfeld)
Date: 2005-06-24 16:53
Message:
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user_id=1188172
This behaviour was introduced with the fixing of bug
#952953, where someone complained that he couldn't call
execl with only one argument.
I tried this directly on the C layer on Linux, and it
segfaults too.
Are there OSes where this is legal?
----------------------------------------------------------------------
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