path: root/security/tomoyo
diff options
authorAlexey Gladkov <>2020-05-18 20:07:38 +0200
committerEric W. Biederman <>2020-05-19 07:07:50 -0500
commit9d78edeaec759f997c303f286ecd39daee166f2a (patch)
tree2325279bb24196709e59a506cbf4f346c1e69a2b /security/tomoyo
parent2dd8083f6d8acd1371ccabedef1c9f1ad272a90d (diff)
proc: proc_pid_ns takes super_block as an argument
syzbot found that touch /proc/testfile causes NULL pointer dereference at tomoyo_get_local_path() because inode of the dentry is NULL. Before c59f415a7cb6, Tomoyo received pid_ns from proc's s_fs_info directly. Since proc_pid_ns() can only work with inode, using it in the tomoyo_get_local_path() was wrong. To avoid creating more functions for getting proc_ns, change the argument type of the proc_pid_ns() function. Then, Tomoyo can use the existing super_block to get pid_ns. Link: Link: Reported-by: Fixes: c59f415a7cb6 ("Use proc_pid_ns() to get pid_namespace from the proc superblock") Signed-off-by: Alexey Gladkov <> Signed-off-by: Eric W. Biederman <>
Diffstat (limited to 'security/tomoyo')
1 files changed, 1 insertions, 1 deletions
diff --git a/security/tomoyo/realpath.c b/security/tomoyo/realpath.c
index 08b096e2f7e3..df4798980416 100644
--- a/security/tomoyo/realpath.c
+++ b/security/tomoyo/realpath.c
@@ -162,7 +162,7 @@ static char *tomoyo_get_local_path(struct dentry *dentry, char * const buffer,
if (sb->s_magic == PROC_SUPER_MAGIC && *pos == '/') {
char *ep;
const pid_t pid = (pid_t) simple_strtoul(pos + 1, &ep, 10);
- struct pid_namespace *proc_pidns = proc_pid_ns(d_inode(dentry));
+ struct pid_namespace *proc_pidns = proc_pid_ns(sb);
if (*ep == '/' && pid && pid ==
task_tgid_nr_ns(current, proc_pidns)) {