diff options
| author | Paul Moore <paul.moore@hp.com> | 2006-12-15 16:49:27 -0500 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-12-22 11:11:56 -0800 |
| commit | 1fd2a25b77bb6755d38aca50b826ff8dca81d762 (patch) | |
| tree | 9f5f8bd5cb99cefa8db812f7182b22da6ecf993c /net/netlabel | |
| parent | c2fda5fed81eea077363b285b66eafce20dfd45a (diff) | |
| download | lwn-1fd2a25b77bb6755d38aca50b826ff8dca81d762.tar.gz lwn-1fd2a25b77bb6755d38aca50b826ff8dca81d762.zip | |
NetLabel: perform input validation earlier on CIPSOv4 DOI add ops
There are a couple of cases where the user input for a CIPSOv4 DOI add
operation was not being done soon enough; the result was unexpected behavior
which was resulting in oops/panics/lockups on some platforms. This patch moves
the existing input validation code earlier in the code path to protect against
bogus user input.
Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'net/netlabel')
| -rw-r--r-- | net/netlabel/netlabel_cipso_v4.c | 28 |
1 files changed, 17 insertions, 11 deletions
diff --git a/net/netlabel/netlabel_cipso_v4.c b/net/netlabel/netlabel_cipso_v4.c index 743b05734a49..1fbc906a9737 100644 --- a/net/netlabel/netlabel_cipso_v4.c +++ b/net/netlabel/netlabel_cipso_v4.c @@ -185,20 +185,31 @@ static int netlbl_cipsov4_add_std(struct genl_info *info) ret_val = netlbl_cipsov4_add_common(info, doi_def); if (ret_val != 0) goto add_std_failure; + ret_val = -EINVAL; nla_for_each_nested(nla_a, info->attrs[NLBL_CIPSOV4_A_MLSLVLLST], nla_a_rem) if (nla_a->nla_type == NLBL_CIPSOV4_A_MLSLVL) { + if (nla_validate_nested(nla_a, + NLBL_CIPSOV4_A_MAX, + netlbl_cipsov4_genl_policy) != 0) + goto add_std_failure; nla_for_each_nested(nla_b, nla_a, nla_b_rem) switch (nla_b->nla_type) { case NLBL_CIPSOV4_A_MLSLVLLOC: + if (nla_get_u32(nla_b) > + CIPSO_V4_MAX_LOC_LVLS) + goto add_std_failure; if (nla_get_u32(nla_b) >= doi_def->map.std->lvl.local_size) doi_def->map.std->lvl.local_size = nla_get_u32(nla_b) + 1; break; case NLBL_CIPSOV4_A_MLSLVLREM: + if (nla_get_u32(nla_b) > + CIPSO_V4_MAX_REM_LVLS) + goto add_std_failure; if (nla_get_u32(nla_b) >= doi_def->map.std->lvl.cipso_size) doi_def->map.std->lvl.cipso_size = @@ -206,9 +217,6 @@ static int netlbl_cipsov4_add_std(struct genl_info *info) break; } } - if (doi_def->map.std->lvl.local_size > CIPSO_V4_MAX_LOC_LVLS || - doi_def->map.std->lvl.cipso_size > CIPSO_V4_MAX_REM_LVLS) - goto add_std_failure; doi_def->map.std->lvl.local = kcalloc(doi_def->map.std->lvl.local_size, sizeof(u32), GFP_KERNEL); @@ -230,11 +238,6 @@ static int netlbl_cipsov4_add_std(struct genl_info *info) struct nlattr *lvl_loc; struct nlattr *lvl_rem; - if (nla_validate_nested(nla_a, - NLBL_CIPSOV4_A_MAX, - netlbl_cipsov4_genl_policy) != 0) - goto add_std_failure; - lvl_loc = nla_find_nested(nla_a, NLBL_CIPSOV4_A_MLSLVLLOC); lvl_rem = nla_find_nested(nla_a, @@ -264,12 +267,18 @@ static int netlbl_cipsov4_add_std(struct genl_info *info) nla_for_each_nested(nla_b, nla_a, nla_b_rem) switch (nla_b->nla_type) { case NLBL_CIPSOV4_A_MLSCATLOC: + if (nla_get_u32(nla_b) > + CIPSO_V4_MAX_LOC_CATS) + goto add_std_failure; if (nla_get_u32(nla_b) >= doi_def->map.std->cat.local_size) doi_def->map.std->cat.local_size = nla_get_u32(nla_b) + 1; break; case NLBL_CIPSOV4_A_MLSCATREM: + if (nla_get_u32(nla_b) > + CIPSO_V4_MAX_REM_CATS) + goto add_std_failure; if (nla_get_u32(nla_b) >= doi_def->map.std->cat.cipso_size) doi_def->map.std->cat.cipso_size = @@ -277,9 +286,6 @@ static int netlbl_cipsov4_add_std(struct genl_info *info) break; } } - if (doi_def->map.std->cat.local_size > CIPSO_V4_MAX_LOC_CATS || - doi_def->map.std->cat.cipso_size > CIPSO_V4_MAX_REM_CATS) - goto add_std_failure; doi_def->map.std->cat.local = kcalloc( doi_def->map.std->cat.local_size, sizeof(u32), |