diff options
| author | Casey Schaufler <casey@schaufler-ca.com> | 2022-01-27 04:51:00 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-08 14:23:54 +0200 |
| commit | f3f93a1aaafc3032e0a9655fb43deccfb3e953a3 (patch) | |
| tree | e2a940093e94eca5eefa1b4e19430adf92cfed59 /security/selinux/hooks.c | |
| parent | c331c9d1d2b7a5ce875f8f1ac53e3987f73ecc75 (diff) | |
LSM: general protection fault in legacy_parse_param
[ Upstream commit ecff30575b5ad0eda149aadad247b7f75411fd47 ]
The usual LSM hook "bail on fail" scheme doesn't work for cases where
a security module may return an error code indicating that it does not
recognize an input. In this particular case Smack sees a mount option
that it recognizes, and returns 0. A call to a BPF hook follows, which
returns -ENOPARAM, which confuses the caller because Smack has processed
its data.
The SELinux hook incorrectly returns 1 on success. There was a time
when this was correct, however the current expectation is that it
return 0 on success. This is repaired.
Reported-by: syzbot+d1e3b1d92d25abf97943@syzkaller.appspotmail.com
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Acked-by: James Morris <jamorris@linux.microsoft.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'security/selinux/hooks.c')
| -rw-r--r-- | security/selinux/hooks.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index f3c8acf45ed99..9a89e456d3789 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -2915,10 +2915,9 @@ static int selinux_fs_context_parse_param(struct fs_context *fc, return opt; rc = selinux_add_opt(opt, param->string, &fc->security); - if (!rc) { + if (!rc) param->string = NULL; - rc = 1; - } + return rc; } |