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| author | Alexey Gladkov <legion@kernel.org> | 2021-04-22 14:27:14 +0200 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2021-04-30 14:14:02 -0500 |
| commit | d7c9e99aee48e6bc0b427f3e3c658a6aba15001e (patch) | |
| tree | 61da3b62f597bf4d3658ce6d3198f7e4ae4ddf37 /fs/hugetlbfs | |
| parent | d64696905554e919321e31afc210606653b8f6a4 (diff) | |
| download | linux-d7c9e99aee48e6bc0b427f3e3c658a6aba15001e.tar.bz2 | |
Reimplement RLIMIT_MEMLOCK on top of ucounts
The rlimit counter is tied to uid in the user_namespace. This allows
rlimit values to be specified in userns even if they are already
globally exceeded by the user. However, the value of the previous
user_namespaces cannot be exceeded.
Changelog
v11:
* Fix issue found by lkp robot.
v8:
* Fix issues found by lkp-tests project.
v7:
* Keep only ucounts for RLIMIT_MEMLOCK checks instead of struct cred.
v6:
* Fix bug in hugetlb_file_setup() detected by trinity.
Reported-by: kernel test robot <oliver.sang@intel.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Alexey Gladkov <legion@kernel.org>
Link: https://lkml.kernel.org/r/970d50c70c71bfd4496e0e8d2a0a32feebebb350.1619094428.git.legion@kernel.org
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'fs/hugetlbfs')
| -rw-r--r-- | fs/hugetlbfs/inode.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index 701c82c36138..be519fc9559a 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -1443,7 +1443,7 @@ static int get_hstate_idx(int page_size_log) * otherwise hugetlb_reserve_pages reserves one less hugepages than intended. */ struct file *hugetlb_file_setup(const char *name, size_t size, - vm_flags_t acctflag, struct user_struct **user, + vm_flags_t acctflag, struct ucounts **ucounts, int creat_flags, int page_size_log) { struct inode *inode; @@ -1455,20 +1455,20 @@ struct file *hugetlb_file_setup(const char *name, size_t size, if (hstate_idx < 0) return ERR_PTR(-ENODEV); - *user = NULL; + *ucounts = NULL; mnt = hugetlbfs_vfsmount[hstate_idx]; if (!mnt) return ERR_PTR(-ENOENT); if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) { - *user = current_user(); - if (user_shm_lock(size, *user)) { + *ucounts = current_ucounts(); + if (user_shm_lock(size, *ucounts)) { task_lock(current); pr_warn_once("%s (%d): Using mlock ulimits for SHM_HUGETLB is deprecated\n", current->comm, current->pid); task_unlock(current); } else { - *user = NULL; + *ucounts = NULL; return ERR_PTR(-EPERM); } } @@ -1495,9 +1495,9 @@ struct file *hugetlb_file_setup(const char *name, size_t size, iput(inode); out: - if (*user) { - user_shm_unlock(size, *user); - *user = NULL; + if (*ucounts) { + user_shm_unlock(size, *ucounts); + *ucounts = NULL; } return file; } |