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-rw-r--r--mm/shmem.c22
1 files changed, 16 insertions, 6 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index 68412fa..be5af34 100644
--- 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;
}
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