From 8751e03958f2adbfba6a0f186f4c5797c950c22a Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Tue, 7 Feb 2012 16:46:12 -0800 Subject: userns: Convert tmpfs to use kuid and kgid where appropriate Acked-by: Serge Hallyn Signed-off-by: Eric W. Biederman --- mm/shmem.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-) (limited to 'mm') diff --git a/mm/shmem.c b/mm/shmem.c index f99ff3e50bd..d7b433a1ef5 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; } -- cgit v1.2.3-70-g09d2