diff options
| author | Ondrej Mosnacek <omosnace@redhat.com> | 2019-06-12 11:12:26 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-07-26 10:14:07 +0300 |
| commit | 914026d581007a67a911630a0a8afebdbe7d41d3 (patch) | |
| tree | 3861a4bb44904fc67f4e65cc138ed147fa8c5d36 /security | |
| parent | 10e3788e6575e370c63f3f6aa501b19c3b5aa9f6 (diff) | |
| download | linux-914026d581007a67a911630a0a8afebdbe7d41d3.tar.xz | |
selinux: fix empty write to keycreate file
[ Upstream commit 464c258aa45b09f16aa0f05847ed8895873262d9 ]
When sid == 0 (we are resetting keycreate_sid to the default value), we
should skip the KEY__CREATE check.
Before this patch, doing a zero-sized write to /proc/self/keycreate
would check if the current task can create unlabeled keys (which would
usually fail with -EACCESS and generate an AVC). Now it skips the check
and correctly sets the task's keycreate_sid to 0.
Bug report: https://bugzilla.redhat.com/show_bug.cgi?id=1719067
Tested using the reproducer from the report above.
Fixes: 4eb582cf1fbd ("[PATCH] keys: add a way to store the appropriate context for newly-created keys")
Reported-by: Kir Kolyshkin <kir@sacred.ru>
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'security')
| -rw-r--r-- | security/selinux/hooks.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 70bad15ed7a0..109ab510bdb1 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -6550,11 +6550,12 @@ static int selinux_setprocattr(const char *name, void *value, size_t size) } else if (!strcmp(name, "fscreate")) { tsec->create_sid = sid; } else if (!strcmp(name, "keycreate")) { - error = avc_has_perm(&selinux_state, - mysid, sid, SECCLASS_KEY, KEY__CREATE, - NULL); - if (error) - goto abort_change; + if (sid) { + error = avc_has_perm(&selinux_state, mysid, sid, + SECCLASS_KEY, KEY__CREATE, NULL); + if (error) + goto abort_change; + } tsec->keycreate_sid = sid; } else if (!strcmp(name, "sockcreate")) { tsec->sockcreate_sid = sid; |