Hi,
When using valgrind on the below program on a AMD64 machine
int main ()
{
return 0;
}
I got
$ valgrind --track-origins=yes ./test
==9549== Memcheck, a memory error detector.
==9549== Copyright (C) 2002-2008, and GNU GPL'd, by Julian Seward et al.
==9549== Using LibVEX rev 1878, a library for dynamic binary translation.
==9549== Copyright (C) 2004-2008, and GNU GPL'd, by OpenWorks LLP.
==9549== Using valgrind-3.4.0-Debian, a dynamic binary instrumentation
framework.
==9549== Copyright (C) 2000-2008, and GNU GPL'd, by Julian Seward et al.
==9549== For more details, rerun with: -v
==9549==
==9549== Conditional jump or move depends on uninitialised value(s)
==9549== at 0x4015D37: strlen (in /lib/ld-2.9.so)
==9549== by 0x4004F72: fillin_rpath (in /lib/ld-2.9.so)
==9549== by 0x40082F8: _dl_init_paths (in /lib/ld-2.9.so)
==9549== by 0x4002FBB: dl_main (in /lib/ld-2.9.so)
==9549== by 0x4013F84: _dl_sysdep_start (in /lib/ld-2.9.so)
==9549== by 0x4001348: _dl_start (in /lib/ld-2.9.so)
==9549== by 0x4000A97: (within /lib/ld-2.9.so)
==9549== Uninitialised value was created by a stack allocation
==9549== at 0x4008264: _dl_init_paths (in /lib/ld-2.9.so)
==9549==
==9549== Conditional jump or move depends on uninitialised value(s)
==9549== at 0x4015AFE: index (in /lib/ld-2.9.so)
==9549== by 0x400731A: expand_dynamic_string_token (in /lib/ld-2.9.so)
==9549== by 0x40078D5: _dl_map_object (in /lib/ld-2.9.so)
==9549== by 0x40017AA: map_doit (in /lib/ld-2.9.so)
==9549== by 0x400D455: _dl_catch_error (in /lib/ld-2.9.so)
==9549== by 0x40016AE: do_preload (in /lib/ld-2.9.so)
==9549== by 0x4003BAF: dl_main (in /lib/ld-2.9.so)
==9549== by 0x4013F84: _dl_sysdep_start (in /lib/ld-2.9.so)
==9549== by 0x4001348: _dl_start (in /lib/ld-2.9.so)
==9549== by 0x4000A97: (within /lib/ld-2.9.so)
==9549== Uninitialised value was created by a stack allocation
==9549== at 0x4003A81: dl_main (in /lib/ld-2.9.so)
==9549==
==9549== Conditional jump or move depends on uninitialised value(s)
==9549== at 0x4015B09: index (in /lib/ld-2.9.so)
==9549== by 0x400731A: expand_dynamic_string_token (in /lib/ld-2.9.so)
==9549== by 0x40078D5: _dl_map_object (in /lib/ld-2.9.so)
==9549== by 0x40017AA: map_doit (in /lib/ld-2.9.so)
==9549== by 0x400D455: _dl_catch_error (in /lib/ld-2.9.so)
==9549== by 0x40016AE: do_preload (in /lib/ld-2.9.so)
==9549== by 0x4003BAF: dl_main (in /lib/ld-2.9.so)
==9549== by 0x4013F84: _dl_sysdep_start (in /lib/ld-2.9.so)
==9549== by 0x4001348: _dl_start (in /lib/ld-2.9.so)
==9549== by 0x4000A97: (within /lib/ld-2.9.so)
==9549== Uninitialised value was created by a stack allocation
==9549== at 0x4003A81: dl_main (in /lib/ld-2.9.so)
==9549==
==9549== Conditional jump or move depends on uninitialised value(s)
==9549== at 0x4015B14: index (in /lib/ld-2.9.so)
==9549== by 0x400731A: expand_dynamic_string_token (in /lib/ld-2.9.so)
==9549== by 0x40078D5: _dl_map_object (in /lib/ld-2.9.so)
==9549== by 0x40017AA: map_doit (in /lib/ld-2.9.so)
==9549== by 0x400D455: _dl_catch_error (in /lib/ld-2.9.so)
==9549== by 0x40016AE: do_preload (in /lib/ld-2.9.so)
==9549== by 0x4003BAF: dl_main (in /lib/ld-2.9.so)
==9549== by 0x4013F84: _dl_sysdep_start (in /lib/ld-2.9.so)
==9549== by 0x4001348: _dl_start (in /lib/ld-2.9.so)
==9549== by 0x4000A97: (within /lib/ld-2.9.so)
==9549== Uninitialised value was created by a stack allocation
==9549== at 0x4003A81: dl_main (in /lib/ld-2.9.so)
==9549==
==9549== Conditional jump or move depends on uninitialised value(s)
==9549== at 0x4015D51: strlen (in /lib/ld-2.9.so)
==9549== by 0x4004DE5: local_strdup (in /lib/ld-2.9.so)
==9549== by 0x40078D5: _dl_map_object (in /lib/ld-2.9.so)
==9549== by 0x40017AA: map_doit (in /lib/ld-2.9.so)
==9549== by 0x400D455: _dl_catch_error (in /lib/ld-2.9.so)
==9549== by 0x40016AE: do_preload (in /lib/ld-2.9.so)
==9549== by 0x4003BAF: dl_main (in /lib/ld-2.9.so)
==9549== by 0x4013F84: _dl_sysdep_start (in /lib/ld-2.9.so)
==9549== by 0x4001348: _dl_start (in /lib/ld-2.9.so)
==9549== by 0x4000A97: (within /lib/ld-2.9.so)
==9549== Uninitialised value was created by a stack allocation
==9549== at 0x4003A81: dl_main (in /lib/ld-2.9.so)
==9549==
==9549== Conditional jump or move depends on uninitialised value(s)
==9549== at 0x4015D51: strlen (in /lib/ld-2.9.so)
==9549== by 0x400A16E: _dl_new_object (in /lib/ld-2.9.so)
==9549== by 0x4005FD7: _dl_map_object_from_fd (in /lib/ld-2.9.so)
==9549== by 0x400797C: _dl_map_object (in /lib/ld-2.9.so)
==9549== by 0x40017AA: map_doit (in /lib/ld-2.9.so)
==9549== by 0x400D455: _dl_catch_error (in /lib/ld-2.9.so)
==9549== by 0x40016AE: do_preload (in /lib/ld-2.9.so)
==9549== by 0x4003BAF: dl_main (in /lib/ld-2.9.so)
==9549== by 0x4013F84: _dl_sysdep_start (in /lib/ld-2.9.so)
==9549== by 0x4001348: _dl_start (in /lib/ld-2.9.so)
==9549== by 0x4000A97: (within /lib/ld-2.9.so)
==9549== Uninitialised value was created by a stack allocation
==9549== at 0x4003A81: dl_main (in /lib/ld-2.9.so)
==9549==
==9549== Conditional jump or move depends on uninitialised value(s)
==9549== at 0x400A8E9: _dl_relocate_object (in /lib/ld-2.9.so)
==9549== by 0x400380A: dl_main (in /lib/ld-2.9.so)
==9549== by 0x4013F84: _dl_sysdep_start (in /lib/ld-2.9.so)
==9549== by 0x4001348: _dl_start (in /lib/ld-2.9.so)
==9549== by 0x4000A97: (within /lib/ld-2.9.so)
==9549== Uninitialised value was created by a stack allocation
==9549== at 0x400A770: _dl_relocate_object (in /lib/ld-2.9.so)
==9549==
==9549== Conditional jump or move depends on uninitialised value(s)
==9549== at 0x400A8F6: _dl_relocate_object (in /lib/ld-2.9.so)
==9549== by 0x400380A: dl_main (in /lib/ld-2.9.so)
==9549== by 0x4013F84: _dl_sysdep_start (in /lib/ld-2.9.so)
==9549== by 0x4001348: _dl_start (in /lib/ld-2.9.so)
==9549== by 0x4000A97: (within /lib/ld-2.9.so)
==9549== Uninitialised value was created by a stack allocation
==9549== at 0x400A770: _dl_relocate_object (in /lib/ld-2.9.so)
==9549==
==9549== ERROR SUMMARY: 8 errors from 8 contexts (suppressed: 0 from 0)
==9549== malloc/free: in use at exit: 0 bytes in 0 blocks.
==9549== malloc/free: 0 allocs, 0 frees, 0 bytes allocated.
==9549== For counts of detected errors, rerun with: -v
==9549== All heap blocks were freed -- no leaks are possible.
My libc is glibc 2.9-0exp2 from Debian experimental. I looked at
==9549== Uninitialised value was created by a stack allocation
==9549== at 0x4003A81: dl_main (in /lib/ld-2.9.so)
Its source code is
char *list = strdupa (preloadlist);
strdupa is defined as
# define strdupa(s) \
(__extension__ \
({ \
__const char *__old = (s); \
size_t __len = strlen (__old) + 1; \
char *__new = (char *) __builtin_alloca (__len); \
(char *) memcpy (__new, __old, __len); \
}))
So it looks like that the allocaed memory has been initialized.
I don't know if it's a bug of valgrind or something else. Should I report a bug
of this for valgrind?
Thanks,
Jie
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