[PATCH AUTOSEL 4.9 49/57] audit: Fix extended comparison of GID/EGID

From: Sasha Levin
Date: Sun Sep 16 2018 - 23:06:46 EST


From: Ondrej MosnÃÄek <omosnace@xxxxxxxxxx>

[ Upstream commit af85d1772e31fed34165a1b3decef340cf4080c0 ]

The audit_filter_rules() function in auditsc.c used the in_[e]group_p()
functions to check GID/EGID match, but these functions use the current
task's credentials, while the comparison should use the credentials of
the task given to audit_filter_rules() as a parameter (tsk).

Note that we can use group_search(cred->group_info, ...) as a
replacement for both in_group_p and in_egroup_p as these functions only
compare the parameter to cred->fsgid/egid and then call group_search.

In fact, the usage of in_group_p was even more incorrect: it compares to
cred->fsgid (which is usually equal to cred->egid) and not cred->gid.

GitHub issue:
https://github.com/linux-audit/audit-kernel/issues/82

Fixes: 37eebe39c973 ("audit: improve GID/EGID comparation logic")
Signed-off-by: Ondrej Mosnacek <omosnace@xxxxxxxxxx>
Signed-off-by: Paul Moore <paul@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
---
kernel/auditsc.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index c2aaf539728f..77434c2d42e3 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -488,20 +488,20 @@ static int audit_filter_rules(struct task_struct *tsk,
result = audit_gid_comparator(cred->gid, f->op, f->gid);
if (f->op == Audit_equal) {
if (!result)
- result = in_group_p(f->gid);
+ result = groups_search(cred->group_info, f->gid);
} else if (f->op == Audit_not_equal) {
if (result)
- result = !in_group_p(f->gid);
+ result = !groups_search(cred->group_info, f->gid);
}
break;
case AUDIT_EGID:
result = audit_gid_comparator(cred->egid, f->op, f->gid);
if (f->op == Audit_equal) {
if (!result)
- result = in_egroup_p(f->gid);
+ result = groups_search(cred->group_info, f->gid);
} else if (f->op == Audit_not_equal) {
if (result)
- result = !in_egroup_p(f->gid);
+ result = !groups_search(cred->group_info, f->gid);
}
break;
case AUDIT_SGID:
--
2.17.1