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elf: _dl_find_object may return 1 during early startup (bug 30515)

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Success is reported with a 0 return value, and failure is -1.
Enhance the kitchen sink test elf/tst-audit28 to cover
_dl_find_object as well.

Fixes commit 5d28a8962d ("elf: Add _dl_find_object function")
and bug 30515.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Florian Weimer 2023-07-07 10:11:26 +02:00
parent 0567edf1b2
commit 1bcfe0f732
2 changed files with 12 additions and 1 deletions
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2
elf/dl-find_object.c
View File

@ -46,7 +46,7 @@ _dl_find_object_slow (void *pc, struct dl_find_object *result)
struct dl_find_object_internal internal;
_dl_find_object_from_map (l, &internal);
_dl_find_object_to_external (&internal, result);
return 1;
return 0;
}
/* Object not found. */

11
elf/tst-auditmod28.c
View File

@ -71,6 +71,17 @@ la_version (unsigned int current)
TEST_VERIFY (dladdr1 (&_exit, &info, &extra_info, RTLD_DL_LINKMAP) != 0);
TEST_VERIFY (extra_info == handle);
/* Check _dl_find_object. */
struct dl_find_object dlfo;
TEST_COMPARE (_dl_find_object (__builtin_return_address (0), &dlfo), 0);
/* "ld.so" is seen with --enable-hardcoded-path-in-tests. */
if (strcmp (basename (dlfo.dlfo_link_map->l_name), "ld.so") != 0)
TEST_COMPARE_STRING (basename (dlfo.dlfo_link_map->l_name), LD_SO);
TEST_COMPARE (_dl_find_object (dlsym (handle, "environ"), &dlfo), 0);
TEST_COMPARE_STRING (basename (dlfo.dlfo_link_map->l_name), LIBC_SO);
TEST_COMPARE (_dl_find_object ((void *) 1, &dlfo), -1);
TEST_COMPARE (_dl_find_object ((void *) -1, &dlfo), -1);
/* Verify that dlmopen creates a new namespace. */
void *dlmopen_handle = xdlmopen (LM_ID_NEWLM, LIBC_SO, RTLD_NOW);
TEST_VERIFY (dlmopen_handle != handle);