diff options
Diffstat (limited to 'security')
| -rw-r--r-- | security/selinux/avc.c | 15 | ||||
| -rw-r--r-- | security/selinux/include/security.h | 3 | ||||
| -rw-r--r-- | security/selinux/ss/services.c | 37 |
3 files changed, 50 insertions, 5 deletions
diff --git a/security/selinux/avc.c b/security/selinux/avc.c index 5ebad47391c9..3a27418b20d7 100644 --- a/security/selinux/avc.c +++ b/security/selinux/avc.c @@ -734,6 +734,21 @@ static void avc_audit_post_callback(struct audit_buffer *ab, void *a) if (sad->denied) audit_log_format(ab, " permissive=%u", sad->result ? 0 : 1); + + /* in case of invalid context report also the actual context string */ + rc = security_sid_to_context_inval(sad->state, sad->ssid, &scontext, + &scontext_len); + if (!rc && scontext) { + audit_log_format(ab, " srawcon=%s", scontext); + kfree(scontext); + } + + rc = security_sid_to_context_inval(sad->state, sad->tsid, &scontext, + &scontext_len); + if (!rc && scontext) { + audit_log_format(ab, " trawcon=%s", scontext); + kfree(scontext); + } } /* This is the slow part of avc audit with big stack footprint */ diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h index ba8eedf42b90..f68fb25b5702 100644 --- a/security/selinux/include/security.h +++ b/security/selinux/include/security.h @@ -255,6 +255,9 @@ int security_sid_to_context(struct selinux_state *state, u32 sid, int security_sid_to_context_force(struct selinux_state *state, u32 sid, char **scontext, u32 *scontext_len); +int security_sid_to_context_inval(struct selinux_state *state, + u32 sid, char **scontext, u32 *scontext_len); + int security_context_to_sid(struct selinux_state *state, const char *scontext, u32 scontext_len, u32 *out_sid, gfp_t gfp); diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index dd44126c8d14..9be05c3e99dc 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -1281,7 +1281,8 @@ const char *security_get_initial_sid_context(u32 sid) static int security_sid_to_context_core(struct selinux_state *state, u32 sid, char **scontext, - u32 *scontext_len, int force) + u32 *scontext_len, int force, + int only_invalid) { struct policydb *policydb; struct sidtab *sidtab; @@ -1326,8 +1327,14 @@ static int security_sid_to_context_core(struct selinux_state *state, rc = -EINVAL; goto out_unlock; } - rc = context_struct_to_string(policydb, context, scontext, - scontext_len); + if (only_invalid && !context->len) { + scontext = NULL; + scontext_len = 0; + rc = 0; + } else { + rc = context_struct_to_string(policydb, context, scontext, + scontext_len); + } out_unlock: read_unlock(&state->ss->policy_rwlock); out: @@ -1349,14 +1356,34 @@ int security_sid_to_context(struct selinux_state *state, u32 sid, char **scontext, u32 *scontext_len) { return security_sid_to_context_core(state, sid, scontext, - scontext_len, 0); + scontext_len, 0, 0); } int security_sid_to_context_force(struct selinux_state *state, u32 sid, char **scontext, u32 *scontext_len) { return security_sid_to_context_core(state, sid, scontext, - scontext_len, 1); + scontext_len, 1, 0); +} + +/** + * security_sid_to_context_inval - Obtain a context for a given SID if it + * is invalid. + * @sid: security identifier, SID + * @scontext: security context + * @scontext_len: length in bytes + * + * Write the string representation of the context associated with @sid + * into a dynamically allocated string of the correct size, but only if the + * context is invalid in the current policy. Set @scontext to point to + * this string (or NULL if the context is valid) and set @scontext_len to + * the length of the string (or 0 if the context is valid). + */ +int security_sid_to_context_inval(struct selinux_state *state, u32 sid, + char **scontext, u32 *scontext_len) +{ + return security_sid_to_context_core(state, sid, scontext, + scontext_len, 1, 1); } /* |