Public bug reported:
Simple testcase in Ubuntu 7.04:
1. create main.cc:
#include <dlfcn.h>
int main(int argc, char *argv[])
{
dlopen("libm.so",RTLD_LAZY|RTLD_GLOBAL);
}
2. compile main.cc: "gcc -ldl main.cc"
3. run valgrind on resulting a.out: "valgrind --tool=memcheck ./a.out"
This results for me in the following error reported by valgrind:
==14247== Invalid read of size 4
==14247== at 0x4014743: (within /lib/ld-2.5.so)
==14247== by 0x4005B69: (within /lib/ld-2.5.so)
==14247== by 0x4007995: (within /lib/ld-2.5.so)
==14247== by 0x4010D94: (within /lib/ld-2.5.so)
==14247== by 0x400CFA5: (within /lib/ld-2.5.so)
==14247== by 0x40108ED: (within /lib/ld-2.5.so)
==14247== by 0x403EC2C: (within /lib/tls/i686/cmov/libdl-2.5.so)
==14247== by 0x400CFA5: (within /lib/ld-2.5.so)
==14247== by 0x403F2AB: (within /lib/tls/i686/cmov/libdl-2.5.so)
==14247== by 0x403EB63: dlopen (in /lib/tls/i686/cmov/libdl-2.5.so)
==14247== by 0x80483F8: main (in /home/frank/test/dlopen/a.out)
==14247== Address 0x4185038 is 16 bytes inside a block of size 17 alloc'd
==14247== at 0x4021620: malloc (vg_replace_malloc.c:149)
==14247== by 0x4007F33: (within /lib/ld-2.5.so)
==14247== by 0x4010D94: (within /lib/ld-2.5.so)
==14247== by 0x400CFA5: (within /lib/ld-2.5.so)
==14247== by 0x40108ED: (within /lib/ld-2.5.so)
==14247== by 0x403EC2C: (within /lib/tls/i686/cmov/libdl-2.5.so)
==14247== by 0x400CFA5: (within /lib/ld-2.5.so)
==14247== by 0x403F2AB: (within /lib/tls/i686/cmov/libdl-2.5.so)
==14247== by 0x403EB63: dlopen (in /lib/tls/i686/cmov/libdl-2.5.so)
==14247== by 0x80483F8: main (in /home/frank/test/dlopen/a.out)
I have seen the same in Ubuntu 6.06 with a more complex program, but not in
this simple test case. Debian 4.0 doesn't show this problem, neither do many
other distributions I have tested (e.g. Scientific Linux 4).
To check whether this is a valgrind problem, I compiled version 3.2.3, and
there the same problem is reported. If this is still a valgrind problem, please
reassign this bug report.
** Affects: glibc (Ubuntu)
Importance: Undecided
Status: Unconfirmed
--
valgrind finds "Invalid read of size 4" in dlopen
https://bugs.launchpad.net/bugs/114032
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