diff options
| author |   Austin Kim <austin.kim@lge.com> | 2021-07-14 01:11:27 +0100 |
|---|---|---|
| committer |   Paul Moore <paul@paul-moore.com> | 2021-07-14 15:25:27 -0400 |
| commit | 893c47d1964f5c9b00c5468f2cd1a1e9351fbb6a (patch) | |
| tree | 0bf1c6ea3594ce6ceb000ea6b625104e0b6a85d7 /security | |
| parent | Linux 5.14-rc1 (diff) | |
| download | linux-dev-893c47d1964f5c9b00c5468f2cd1a1e9351fbb6a.tar.xz linux-dev-893c47d1964f5c9b00c5468f2cd1a1e9351fbb6a.zip | |
selinux: return early for possible NULL audit buffers
audit_log_start() may return NULL in below cases:
- when audit is not initialized.
- when audit backlog limit exceeds.
After the call to audit_log_start() is made and then possible NULL audit
buffer argument is passed to audit_log_*() functions,
audit_log_*() functions return immediately in case of a NULL audit buffer
argument.
But it is optimal to return early when audit_log_start() returns NULL,
because it is not necessary for audit_log_*() functions to be called with
NULL audit buffer argument.
So add exception handling for possible NULL audit buffers where
return value can be handled from callers.
Signed-off-by: Austin Kim <austin.kim@lge.com>
[PM: tweak subject line]
Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'security')
| -rw-r--r-- | security/selinux/hooks.c | 4 | ||||
| -rw-r--r-- | security/selinux/ss/services.c | 2 |
2 files changed, 6 insertions, 0 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index b0032c42333e..9e84e6635f2f 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -3325,6 +3325,8 @@ static int selinux_inode_setxattr(struct user_namespace *mnt_userns, } ab = audit_log_start(audit_context(), GFP_ATOMIC, AUDIT_SELINUX_ERR); + if (!ab) + return rc; audit_log_format(ab, "op=setxattr invalid_context="); audit_log_n_untrustedstring(ab, value, audit_size); audit_log_end(ab); @@ -6552,6 +6554,8 @@ static int selinux_setprocattr(const char *name, void *value, size_t size) ab = audit_log_start(audit_context(), GFP_ATOMIC, AUDIT_SELINUX_ERR); + if (!ab) + return error; audit_log_format(ab, "op=fscreate invalid_context="); audit_log_n_untrustedstring(ab, value, audit_size); audit_log_end(ab); diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index d84c77f370dc..e5f1b2757a83 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -1673,6 +1673,8 @@ static int compute_sid_handle_invalid_context( if (context_struct_to_string(policydb, newcontext, &n, &nlen)) goto out; ab = audit_log_start(audit_context(), GFP_ATOMIC, AUDIT_SELINUX_ERR); + if (!ab) + goto out; audit_log_format(ab, "op=security_compute_sid invalid_context="); /* no need to record the NUL with untrusted strings */ |