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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>
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#include <dlfcn.h>
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#include <mcheck.h>
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#include <stdlib.h>
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static int
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do_test (void)
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{
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void *h;
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int ret = 0;
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/* Carry out *one* failing call to dlopen before starting mtrace to
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force any one-time inintialization that may happen to the
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executable link map e.g. expansion and caching of $ORIGIN. */
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h = dlopen ("$ORIGIN/tst-leaks1.o", RTLD_LAZY);
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if (h != NULL)
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{
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puts ("dlopen unexpectedly succeeded");
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ret = 1;
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dlclose (h);
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}
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/* Start tracing and run each test 5 times to see if there are any
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leaks in the failing dlopen. */
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mtrace ();
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for (int i = 0; i < 10; i++)
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{
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h = dlopen (i < 5
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? "./tst-leaks1.c"
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: "$ORIGIN/tst-leaks1.o", RTLD_LAZY);
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if (h != NULL)
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{
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puts ("dlopen unexpectedly succeeded");
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ret = 1;
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dlclose (h);
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}
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}
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return ret;
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}
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#include <support/test-driver.c>
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