linux-kernel - [PATCH] audit: free module name

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Message-Id: <20220615154432.314974-1-cgzones@googlemail.com>
Date:   Wed, 15 Jun 2022 17:44:31 +0200
From:   Christian Göttsche <cgzones@...glemail.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Paul Moore <paul@...l-moore.com>, Eric Paris <eparis@...hat.com>,
        Richard Guy Briggs <rgb@...hat.com>, linux-audit@...hat.com,
        linux-kernel@...r.kernel.org
Subject: [PATCH] audit: free module name

Reset the type of the record last as the helper `audit_free_module()`
depends on it.

    unreferenced object 0xffff888153b707f0 (size 16):
      comm "modprobe", pid 1319, jiffies 4295110033 (age 1083.016s)
      hex dump (first 16 bytes):
        62 69 6e 66 6d 74 5f 6d 69 73 63 00 6b 6b 6b a5  binfmt_misc.kkk.
      backtrace:
        [<ffffffffa07dbf9b>] kstrdup+0x2b/0x50
        [<ffffffffa04b0a9d>] __audit_log_kern_module+0x4d/0xf0
        [<ffffffffa03b6664>] load_module+0x9d4/0x2e10
        [<ffffffffa03b8f44>] __do_sys_finit_module+0x114/0x1b0
        [<ffffffffa1f47124>] do_syscall_64+0x34/0x80
        [<ffffffffa200007e>] entry_SYSCALL_64_after_hwframe+0x46/0xb0

Fixes: 12c5e81d3fd0 ("audit: prepare audit_context for use in calling contexts beyond syscalls")
Signed-off-by: Christian Göttsche <cgzones@...glemail.com>
---
 kernel/auditsc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index f3a2abd6d1a1..3a8c9d744800 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1014,10 +1014,10 @@ static void audit_reset_context(struct audit_context *ctx)
 	ctx->target_comm[0] = '\0';
 	unroll_tree_refs(ctx, NULL, 0);
 	WARN_ON(!list_empty(&ctx->killed_trees));
-	ctx->type = 0;
 	audit_free_module(ctx);
 	ctx->fds[0] = -1;
 	audit_proctitle_free(ctx);
+	ctx->type = 0; /* reset last for audit_free_*() */
 }
 
 static inline struct audit_context *audit_alloc_context(enum audit_state state)
-- 
2.36.1