userns: Convert hugetlbfs to use kuid/kgid where appropriate
Note sysctl_hugetlb_shm_group can only be written in the root user
in the initial user namespace, so we can assume sysctl_hugetlb_shm_group
is in the initial user namespace.
Cc: William Irwin <wli@holomorphy.com>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 8349a89..6e572c4 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -42,8 +42,8 @@
static const struct inode_operations hugetlbfs_inode_operations;
struct hugetlbfs_config {
- uid_t uid;
- gid_t gid;
+ kuid_t uid;
+ kgid_t gid;
umode_t mode;
long nr_blocks;
long nr_inodes;
@@ -785,13 +785,17 @@
case Opt_uid:
if (match_int(&args[0], &option))
goto bad_val;
- pconfig->uid = option;
+ pconfig->uid = make_kuid(current_user_ns(), option);
+ if (!uid_valid(pconfig->uid))
+ goto bad_val;
break;
case Opt_gid:
if (match_int(&args[0], &option))
goto bad_val;
- pconfig->gid = option;
+ pconfig->gid = make_kgid(current_user_ns(), option);
+ if (!gid_valid(pconfig->gid))
+ goto bad_val;
break;
case Opt_mode:
@@ -924,7 +928,9 @@
static int can_do_hugetlb_shm(void)
{
- return capable(CAP_IPC_LOCK) || in_group_p(sysctl_hugetlb_shm_group);
+ kgid_t shm_group;
+ shm_group = make_kgid(&init_user_ns, sysctl_hugetlb_shm_group);
+ return capable(CAP_IPC_LOCK) || in_group_p(shm_group);
}
struct file *hugetlb_file_setup(const char *name, unsigned long addr,
diff --git a/init/Kconfig b/init/Kconfig
index 96007af..7ee6e19 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -954,7 +954,6 @@
depends on HFS_FS = n
depends on HFSPLUS_FS = n
depends on HPFS_FS = n
- depends on HUGETLBFS = n
depends on ISO9660_FS = n
depends on JFFS2_FS = n
depends on JFS_FS = n
