Bug 80370 - malloc segfaults if clearenv() has been called
malloc segfaults if clearenv() has been called
Status: CLOSED RAWHIDE
Product: Red Hat Public Beta
Classification: Retired
Component: glibc (Show other bugs)
phoebe
All Linux
medium Severity medium
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Assigned To: Jakub Jelinek
Brian Brock
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Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2002-12-25 00:25 EST by Chaskiel Grundman
Modified: 2016-11-24 10:03 EST (History)
3 users (show)

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Doc Type: Bug Fix
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Last Closed: 2003-01-07 06:22:19 EST
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Description Chaskiel Grundman 2002-12-25 00:25:49 EST
Description of problem:
malloc segfaults if an application calls clearenv() before the first malloc()

Version-Release number of selected component (if applicable):
2.2.93-5

How reproducible:
always

Steps to Reproduce:
1.Compile the following test program:
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char **argv) {

        void *x;
        clearenv();
        x=malloc(100);
        printf("we didn't die\n");
}
2. Run it.
    
Actual results:
Program received signal SIGSEGV, Segmentation fault.
0x420764f6 in ptmalloc_init () from /lib/i686/libc.so.6
(gdb) where
#0  0x420764f6 in ptmalloc_init () from /lib/i686/libc.so.6
#1  0x42076305 in malloc_hook_ini () from /lib/i686/libc.so.6
#2  0x420730f5 in malloc () from /lib/i686/libc.so.6
#3  0x080483c9 in main ()
#4  0x420158d4 in __libc_start_main () from /lib/i686/libc.so.6
Comment 1 Aleksey Nogin 2003-01-07 02:23:26 EST
Still happening in Phoebe (glibc-2.3.1-21):

(gdb) bt
#0  0x42072d52 in posix_memalign () from /lib/i686/libc.so.6
#1  0x42072bd5 in posix_memalign () from /lib/i686/libc.so.6
#2  0x42070205 in malloc () from /lib/i686/libc.so.6
#3  0x080483b3 in main ()
#4  0x42015970 in __libc_start_main () from /lib/i686/libc.so.6

P.S. Possibly related - bug 81259 (a different crash in malloc)
Comment 2 Jakub Jelinek 2003-01-07 06:22:19 EST
glibc-2.3.1-21 is way too old, please upgrade.
This particular bug is fixed since 2.3.1-23 (ATM we're at 2.3.1-32).
Comment 3 Aleksey Nogin 2003-01-07 06:34:12 EST
Any chances of a new glibc being available on up2date?

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