[PATCH 16/24] sys: __sys_setfsuid(): handle fsid mappings

Christian Brauner christian.brauner at ubuntu.com
Tue Feb 11 16:57:45 UTC 2020


Switch setfsuid() to lookup fsids in the fsid mappings. If no fsid mappings are
setup the behavior is unchanged, i.e. fsids are looked up in the id mappings.

Signed-off-by: Christian Brauner <christian.brauner at ubuntu.com>
---
 kernel/sys.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/sys.c b/kernel/sys.c
index a9331f101883..ae376d32c1e3 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -59,6 +59,7 @@
 #include <linux/sched/cputime.h>
 #include <linux/rcupdate.h>
 #include <linux/uidgid.h>
+#include <linux/fsuidgid.h>
 #include <linux/cred.h>
 
 #include <linux/nospec.h>
@@ -802,9 +803,9 @@ long __sys_setfsuid(uid_t uid)
 	kuid_t kuid;
 
 	old = current_cred();
-	old_fsuid = from_kuid_munged(old->user_ns, old->fsuid);
+	old_fsuid = from_kfsuid_munged(old->user_ns, old->fsuid);
 
-	kuid = make_kuid(old->user_ns, uid);
+	kuid = make_kfsuid(old->user_ns, uid);
 	if (!uid_valid(kuid))
 		return old_fsuid;
 
-- 
2.25.0



More information about the Linux-security-module-archive mailing list