path: root/security/apparmor/apparmorfs.c
diff options
authorJohn Johansen <>2019-07-30 02:42:13 -0700
committerJohn Johansen <>2020-01-21 06:00:20 -0800
commit0df34a645bae00c86f383fb063cd3840862837bf (patch)
tree1c9c5f5c44683506e63f718ffa51541e802ec1a4 /security/apparmor/apparmorfs.c
parentf05841a940df995b784b5e3ec6f76141e8337245 (diff)
apparmor: add outofband transition and use it in xattr match
There are cases where the a special out of band transition that can not be triggered by input is useful in separating match conditions in the dfa encoding. The null_transition is currently used as an out of band transition for match conditions that can not contain a \0 in their input but apparmor needs an out of band transition for cases where the match condition is allowed to contain any input character. Achieve this by allowing for an explicit transition out of input range that can only be triggered by code. Signed-off-by: John Johansen <>
Diffstat (limited to 'security/apparmor/apparmorfs.c')
1 files changed, 3 insertions, 1 deletions
diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
index be6dc548d307..d7a179cdaa1e 100644
--- a/security/apparmor/apparmorfs.c
+++ b/security/apparmor/apparmorfs.c
@@ -591,7 +591,7 @@ static __poll_t ns_revision_poll(struct file *file, poll_table *pt)
void __aa_bump_ns_revision(struct aa_ns *ns)
- WRITE_ONCE(ns->revision, ns->revision + 1);
+ WRITE_ONCE(ns->revision, READ_ONCE(ns->revision) + 1);
@@ -2331,6 +2331,8 @@ static struct aa_sfs_entry aa_sfs_entry_versions[] = {
static struct aa_sfs_entry aa_sfs_entry_policy[] = {
AA_SFS_DIR("versions", aa_sfs_entry_versions),
AA_SFS_FILE_BOOLEAN("set_load", 1),
+ /* number of out of band transitions supported */
+ AA_SFS_FILE_U64("outofband", MAX_OOB_SUPPORTED),
{ }