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