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[BZ 21357] unwind-dw2-fde: Call free() outside of unwind mutex

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__deregister_frame_info_bases() calls free() while holding a mutex which
is also used from _Unwind_Find_FDE().  This leads to a deadlock if
AddressSanitizer uses _Unwind_Backtrace() from its free()
implementation.

Checked on mips-linux-gnu and x86_64-linux-gnu.

	[BZ #21357]
	* sysdeps/generic/unwind-dw2-fde.c (__deregister_frame_info_bases):
	Call free() outside of mutex.
This commit is contained in:
Rabin Vincent 2017-04-17 12:03:44 -03:00 committed by Adhemerval Zanella
parent a12ae89f86
commit 2604882cef
2 changed files with 9 additions and 1 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2017-04-17 Rabin Vincent <rabinv@axis.com>
[BZ #21357]
* sysdeps/generic/unwind-dw2-fde.c (__deregister_frame_info_bases):
Call free() outside of mutex.
2017-04-13 Florian Weimer <fweimer@redhat.com>
* csu/check_fds.c (__libc_check_standard_fds): Assume O_NOFOLLOW

4
sysdeps/generic/unwind-dw2-fde.c
View File

@ -202,6 +202,7 @@ __deregister_frame_info_bases (void *begin)
{
struct object **p;
struct object *ob = 0;
struct fde_vector *tofree = NULL;
/* If .eh_frame is empty, we haven't registered. */
if (*(uword *) begin == 0)
@ -225,7 +226,7 @@ __deregister_frame_info_bases (void *begin)
{
ob = *p;
*p = ob->next;
free (ob->u.sort);
tofree = ob->u.sort;
goto out;
}
}
@ -244,6 +245,7 @@ __deregister_frame_info_bases (void *begin)
out:
__gthread_mutex_unlock (&object_mutex);
free (tofree);
return (void *) ob;
}
hidden_def (__deregister_frame_info_bases)