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Message-ID: <20240702094745.96521-1-liwang@redhat.com>
Date: Tue, 2 Jul 2024 17:47:45 +0800
From: Li Wang <liwang@...hat.com>
To: mic@...ikod.net,
gnoack@...gle.com,
paul@...l-moore.com
Cc: linux-kernel@...r.kernel.org,
ltp@...ts.linux.it,
Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
Subject: [RFC PATCH] landlock: fix minimal required size for landlock_ruleset_attr copying
As kernel commit fff69fb03dde ("landlock: Support network rules with TCP bind and connect")
introducing a new field 'handled_access_net' in the structure landlock_ruleset_attr,
but in the landlock_create_ruleset() it still uses the first field 'handled_access_fs'
to calculate minimal size, so that made decrease 1 is useless in LTP landlock01.c to
test the too-small-size.
Test code:
rule_small_size = sizeof(struct landlock_ruleset_attr) - 1;
tst_syscall(__NR_landlock_create_ruleset, ..., rule_small_size, 0)
Result:
landlock01.c:49: TFAIL: Size is too small expected EINVAL: ENOMSG (42)
Signed-off-by: Li Wang <liwang@...hat.com>
Cc: Mickaël Salaün <mic@...ikod.net>
Cc: Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
Cc: Paul Moore <paul@...l-moore.com>
---
Notes:
Hi Mickael,
I'm not quite sure if that is on purpose to use the first field or kernel
bug, can you take a look?
security/landlock/syscalls.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/security/landlock/syscalls.c b/security/landlock/syscalls.c
index 03b470f5a85a..f3cd7def7624 100644
--- a/security/landlock/syscalls.c
+++ b/security/landlock/syscalls.c
@@ -198,7 +198,7 @@ SYSCALL_DEFINE3(landlock_create_ruleset,
/* Copies raw user space buffer. */
err = copy_min_struct_from_user(&ruleset_attr, sizeof(ruleset_attr),
offsetofend(typeof(ruleset_attr),
- handled_access_fs),
+ handled_access_net),
attr, size);
if (err)
return err;
--
2.45.2
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