Merge tag 'writeback' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux

[cascardo/linux.git] / mm / shmem.c

diff --git a/mm/shmem.c b/mm/shmem.c
index 68412fa..be5af34 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2075,6 +2075,8 @@ static int shmem_parse_options(char *options, struct shmem_sb_info *sbinfo,
                               bool remount)
 {
        char *this_char, *value, *rest;
+       uid_t uid;
+       gid_t gid;
 
        while (options != NULL) {
                this_char = options;
@@ -2134,15 +2136,21 @@ static int shmem_parse_options(char *options, struct shmem_sb_info *sbinfo,
                } else if (!strcmp(this_char,"uid")) {
                        if (remount)
                                continue;
-                       sbinfo->uid = simple_strtoul(value, &rest, 0);
+                       uid = simple_strtoul(value, &rest, 0);
                        if (*rest)
                                goto bad_val;
+                       sbinfo->uid = make_kuid(current_user_ns(), uid);
+                       if (!uid_valid(sbinfo->uid))
+                               goto bad_val;
                } else if (!strcmp(this_char,"gid")) {
                        if (remount)
                                continue;
-                       sbinfo->gid = simple_strtoul(value, &rest, 0);
+                       gid = simple_strtoul(value, &rest, 0);
                        if (*rest)
                                goto bad_val;
+                       sbinfo->gid = make_kgid(current_user_ns(), gid);
+                       if (!gid_valid(sbinfo->gid))
+                               goto bad_val;
                } else if (!strcmp(this_char,"mpol")) {
                        if (mpol_parse_str(value, &sbinfo->mpol, 1))
                                goto bad_val;
@@ -2210,10 +2218,12 @@ static int shmem_show_options(struct seq_file *seq, struct dentry *root)
                seq_printf(seq, ",nr_inodes=%lu", sbinfo->max_inodes);
        if (sbinfo->mode != (S_IRWXUGO | S_ISVTX))
                seq_printf(seq, ",mode=%03ho", sbinfo->mode);
-       if (sbinfo->uid != 0)
-               seq_printf(seq, ",uid=%u", sbinfo->uid);
-       if (sbinfo->gid != 0)
-               seq_printf(seq, ",gid=%u", sbinfo->gid);
+       if (!uid_eq(sbinfo->uid, GLOBAL_ROOT_UID))
+               seq_printf(seq, ",uid=%u",
+                               from_kuid_munged(&init_user_ns, sbinfo->uid));
+       if (!gid_eq(sbinfo->gid, GLOBAL_ROOT_GID))
+               seq_printf(seq, ",gid=%u",
+                               from_kgid_munged(&init_user_ns, sbinfo->gid));
        shmem_show_mpol(seq, sbinfo->mpol);
        return 0;
 }