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Use proc_pid_ns() to get pid_namespace from the proc superblock

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To get pid_namespace from the procfs superblock should be used a special
helper. This will avoid errors when s_fs_info will change the type.

Link: https://lore.kernel.org/lkml/20200423200316.164518-3-gladkov.alexey@gmail.com/
Link: https://lore.kernel.org/lkml/20200423112858.95820-1-gladkov.alexey@gmail.com/
Link: https://lore.kernel.org/lkml/06B50A1C-406F-4057-BFA8-3A7729EA7469@lca.pw/
Signed-off-by: Alexey Gladkov <gladkov.alexey@gmail.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Alexey Gladkov
2020-04-23 22:03:10 +02:00
committed by Eric W. Biederman
parent 6ade99ec61
commit c59f415a7c
2 changed files with 5 additions and 3 deletions
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4
security/tomoyo/realpath.c
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@@ -7,6 +7,7 @@
#include "common.h"
#include <linux/magic.h>
#include <linux/proc_fs.h>
/**
* tomoyo_encode2 - Encode binary string to ascii string.
@@ -161,9 +162,10 @@ 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));
if (*ep == '/' && pid && pid ==
task_tgid_nr_ns(current, sb->s_fs_info)) {
task_tgid_nr_ns(current, proc_pidns)) {
pos = ep - 5;
if (pos < buffer)
goto out;