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| author | Eric W. Biederman <ebiederm@xmission.com> | 2012-02-07 16:19:25 -0800 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2012-09-21 03:13:05 -0700 |
| commit | a0eb3a05a8cbe9cd1a41dde3d1b2e5bcc10634f2 (patch) | |
| tree | 61caa3f975dfd2fcf14646822bfb5784e113936e /fs/hugetlbfs/inode.c | |
| parent | 91fa2ccaa87368314527ea7518c545063662d67f (diff) | |
| download | lwn-a0eb3a05a8cbe9cd1a41dde3d1b2e5bcc10634f2.tar.gz lwn-a0eb3a05a8cbe9cd1a41dde3d1b2e5bcc10634f2.zip | |
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>
Diffstat (limited to 'fs/hugetlbfs/inode.c')
| -rw-r--r-- | fs/hugetlbfs/inode.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index 8349a899912e..6e572c4fbf68 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -42,8 +42,8 @@ static const struct inode_operations hugetlbfs_dir_inode_operations; 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 @@ hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig) 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 struct vfsmount *hugetlbfs_vfsmount; 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, |