mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 17:53:37 +08:00
93930ea935
The test tst-leaks1 exercises calling dlopen with a $ORIGIN DST.
This results in a theoretical leak e.g.
Memory not freed:
-----------------
Address Size Caller
0x0000000001d766c0 0x21 at 0x7fb1bd8bf4ab
Or as seen via valgrind:
==27582== 33 bytes in 1 blocks are still reachable in loss record 1 of 1
==27582== at 0x4C2CB6B: malloc (vg_replace_malloc.c:299)
==27582== by 0x40124AA: _dl_get_origin (dl-origin.c:50)
==27582== by 0x4007DB9: expand_dynamic_string_token (dl-load.c:382)
==27582== by 0x400899C: _dl_map_object (dl-load.c:2160)
==27582== by 0x4013020: dl_open_worker (dl-open.c:224)
==27582== by 0x5166F9B: _dl_catch_exception (dl-error-skeleton.c:198)
==27582== by 0x4012BD9: _dl_open (dl-open.c:594)
==27582== by 0x4E39EF5: dlopen_doit (dlopen.c:66)
==27582== by 0x5166F9B: _dl_catch_exception (dl-error-skeleton.c:198)
==27582== by 0x516700E: _dl_catch_error (dl-error-skeleton.c:217)
==27582== by 0x4E3A514: _dlerror_run (dlerror.c:162)
==27582== by 0x4E39F70: dlopen@@GLIBC_2.2.5 (dlopen.c:87)
There is no real leak.
The calling link map (the executable's link map) has it's l_origin
expanded for future use as part of _dl_get_origin, and that results
in the main executable link map having a N-byte allocation for
l->l_origin that is never freed since the executable's link map is
just a part of the process.
To take this into account we do one dlopen with $ORIGIN before
calling mtrace to force the initialization of the executable link
map.
Signed-off-by: Carlos O'Donell <carlos@redhat.com>
43 lines
896 B
C
43 lines
896 B
C
#include <stdio.h>
|
|
#include <dlfcn.h>
|
|
#include <mcheck.h>
|
|
#include <stdlib.h>
|
|
|
|
static int
|
|
do_test (void)
|
|
{
|
|
void *h;
|
|
int ret = 0;
|
|
/* Carry out *one* failing call to dlopen before starting mtrace to
|
|
force any one-time inintialization that may happen to the
|
|
executable link map e.g. expansion and caching of $ORIGIN. */
|
|
h = dlopen ("$ORIGIN/tst-leaks1.o", RTLD_LAZY);
|
|
if (h != NULL)
|
|
{
|
|
puts ("dlopen unexpectedly succeeded");
|
|
ret = 1;
|
|
dlclose (h);
|
|
}
|
|
|
|
/* Start tracing and run each test 5 times to see if there are any
|
|
leaks in the failing dlopen. */
|
|
mtrace ();
|
|
|
|
for (int i = 0; i < 10; i++)
|
|
{
|
|
h = dlopen (i < 5
|
|
? "./tst-leaks1.c"
|
|
: "$ORIGIN/tst-leaks1.o", RTLD_LAZY);
|
|
if (h != NULL)
|
|
{
|
|
puts ("dlopen unexpectedly succeeded");
|
|
ret = 1;
|
|
dlclose (h);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#include <support/test-driver.c>
|