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netlabel: fix out-of-bounds memory accesses 

commit 5578de4834fe0f2a34fedc7374be691443396d1f upstream.

There are two array out-of-bounds memory accesses, one in
cipso_v4_map_lvl_valid(), the other in netlbl_bitmap_walk().  Both
errors are embarassingly simple, and the fixes are straightforward.

As a FYI for anyone backporting this patch to kernels prior to v4.8,
you'll want to apply the netlbl_bitmap_walk() patch to
cipso_v4_bitmap_walk() as netlbl_bitmap_walk() doesn't exist before
Linux v4.8.

Reported-by: Jann Horn <jannh@google.com>
Fixes: 446fda4f26 ("[NetLabel]: CIPSOv4 engine")
Fixes: 3faa8f982f95 ("netlabel: Move bitmap manipulation functions to the NetLabel core.")
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 3.16 following Paul's hint]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
Paul Moore 2019-02-25 19:06:06 -05:00 committed by syphyr
parent de23c77fdb
commit d160a7f65c
1 changed files with 4 additions and 2 deletions
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6
net/ipv4/cipso_ipv4.c
View File

@ -166,7 +166,8 @@ static int cipso_v4_bitmap_walk(const unsigned char *bitmap,
(state == 0 && (byte & bitmask) == 0))
return bit_spot;
bit_spot++;
if (++bit_spot >= bitmap_len)
return -1;
bitmask >>= 1;
if (bitmask == 0) {
byte = bitmap[++byte_offset];
@ -738,7 +739,8 @@ static int cipso_v4_map_lvl_valid(const struct cipso_v4_doi *doi_def, u8 level)
case CIPSO_V4_MAP_PASS:
return 0;
case CIPSO_V4_MAP_TRANS:
if (doi_def->map.std->lvl.cipso[level] < CIPSO_V4_INV_LVL)
if ((level < doi_def->map.std->lvl.cipso_size) &&
(doi_def->map.std->lvl.cipso[level] < CIPSO_V4_INV_LVL))
return 0;
break;
}