linux-kernel - [PATCH v5 2/5] Smack: Prepare for PTRACE_MODE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 26 Sep 2018 13:34:43 -0700
From:   Casey Schaufler <casey.schaufler@...el.com>
To:     kernel-hardening@...ts.openwall.com, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, selinux@...ho.nsa.gov,
        casey.schaufler@...el.com, dave.hansen@...el.com,
        deneen.t.dock@...el.com, kristen@...ux.intel.com,
        arjan@...ux.intel.com
Subject: [PATCH v5 2/5] Smack: Prepare for PTRACE_MODE_SCHED

From: Casey Schaufler <casey@...aufler-ca.com>

A ptrace access check with mode PTRACE_MODE_SCHED gets called
from process switching code. This precludes the use of audit,
as the locking is incompatible. Don't do audit in the PTRACE_MODE_SCHED
case.

Signed-off-by: Casey Schaufler <casey.schaufler@...el.com>
---
 security/smack/smack_lsm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 340fc30ad85d..ffa95bcab599 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -422,7 +422,8 @@ static int smk_ptrace_rule_check(struct task_struct *tracer,
 	struct task_smack *tsp;
 	struct smack_known *tracer_known;
 
-	if ((mode & PTRACE_MODE_NOAUDIT) == 0) {
+	if ((mode & PTRACE_MODE_NOAUDIT) == 0 &&
+	    (mode & PTRACE_MODE_SCHED) == 0) {
 		smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK);
 		smk_ad_setfield_u_tsk(&ad, tracer);
 		saip = &ad;
-- 
2.17.1