This is a note to let you know that I've just added the patch titled
binfmt_flat: Fix corruption when not offsetting data start
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
binfmt_flat-fix-corruption-when-not-offsetting-data-.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7435d81ccfa75086d72166bb6c2746b537465711
Author: Kees Cook <kees@xxxxxxxxxx>
Date: Wed Aug 7 12:51:23 2024 -0700
binfmt_flat: Fix corruption when not offsetting data start
[ Upstream commit 3eb3cd5992f7a0c37edc8d05b4c38c98758d8671 ]
Commit 04d82a6d0881 ("binfmt_flat: allow not offsetting data start")
introduced a RISC-V specific variant of the FLAT format which does
not allocate any space for the (obsolete) array of shared library
pointers. However, it did not disable the code which initializes the
array, resulting in the corruption of sizeof(long) bytes before the DATA
segment, generally the end of the TEXT segment.
Introduce MAX_SHARED_LIBS_UPDATE which depends on the state of
CONFIG_BINFMT_FLAT_NO_DATA_START_OFFSET to guard the initialization of
the shared library pointer region so that it will only be initialized
if space is reserved for it.
Fixes: 04d82a6d0881 ("binfmt_flat: allow not offsetting data start")
Co-developed-by: Stefan O'Rear <sorear@xxxxxxxxxxxx>
Signed-off-by: Stefan O'Rear <sorear@xxxxxxxxxxxx>
Reviewed-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
Acked-by: Greg Ungerer <gerg@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240807195119.it.782-kees@xxxxxxxxxx
Signed-off-by: Kees Cook <kees@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index c26545d71d39a..cd6d5bbb4b9df 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -72,8 +72,10 @@
#ifdef CONFIG_BINFMT_FLAT_NO_DATA_START_OFFSET
#define DATA_START_OFFSET_WORDS (0)
+#define MAX_SHARED_LIBS_UPDATE (0)
#else
#define DATA_START_OFFSET_WORDS (MAX_SHARED_LIBS)
+#define MAX_SHARED_LIBS_UPDATE (MAX_SHARED_LIBS)
#endif
struct lib_info {
@@ -880,7 +882,7 @@ static int load_flat_binary(struct linux_binprm *bprm)
return res;
/* Update data segment pointers for all libraries */
- for (i = 0; i < MAX_SHARED_LIBS; i++) {
+ for (i = 0; i < MAX_SHARED_LIBS_UPDATE; i++) {
if (!libinfo.lib_list[i].loaded)
continue;
for (j = 0; j < MAX_SHARED_LIBS; j++) {
