* [PATCH] libdw: Add sanity check to store_implicit_value
@ 2022-05-09 16:48 Mark Wielaard
2022-05-14 13:40 ` Mark Wielaard
0 siblings, 1 reply; 2+ messages in thread
From: Mark Wielaard @ 2022-05-09 16:48 UTC (permalink / raw)
To: elfutils-devel; +Cc: Mark Wielaard
Don't just skip the block length, but check it is equal to the
op->number that we are going to use as length.
Signed-off-by: Mark Wielaard <mark@klomp.org>
---
libdw/ChangeLog | 4 ++++
libdw/dwarf_getlocation.c | 5 ++++-
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/libdw/ChangeLog b/libdw/ChangeLog
index 631f2f2a..b254d9cd 100644
--- a/libdw/ChangeLog
+++ b/libdw/ChangeLog
@@ -1,3 +1,7 @@
+2022-05-09 Mark Wielaard <mark@klomp.org>
+
+ * dwarf_getlocation.c (store_implicit_value): Check block length.
+
2022-04-16 Mark Wielaard <mark@klomp.org>
* libdwP.h: Remove atomics.h include.
diff --git a/libdw/dwarf_getlocation.c b/libdw/dwarf_getlocation.c
index 5db3cf97..d0d78163 100644
--- a/libdw/dwarf_getlocation.c
+++ b/libdw/dwarf_getlocation.c
@@ -147,7 +147,10 @@ store_implicit_value (Dwarf *dbg, void **cache, Dwarf_Op *op)
sizeof (struct loc_block_s), 1);
const unsigned char *data = (const unsigned char *) (uintptr_t) op->number2;
/* Skip the block length. */
- __libdw_get_uleb128_unchecked (&data);
+ Dwarf_Word length;
+ get_uleb128_unchecked (length, data);
+ if (length != op->number)
+ return -1;
block->addr = op;
block->data = (unsigned char *) data;
block->length = op->number;
--
2.18.4
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] libdw: Add sanity check to store_implicit_value
2022-05-09 16:48 [PATCH] libdw: Add sanity check to store_implicit_value Mark Wielaard
@ 2022-05-14 13:40 ` Mark Wielaard
0 siblings, 0 replies; 2+ messages in thread
From: Mark Wielaard @ 2022-05-14 13:40 UTC (permalink / raw)
To: elfutils-devel
Hi,
On Mon, May 09, 2022 at 06:48:58PM +0200, Mark Wielaard wrote:
> Don't just skip the block length, but check it is equal to the
> op->number that we are going to use as length.
Pushed.
Cheers,
Mark
^ permalink raw reply [flat|nested] 2+ messages in thread
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