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authorAlexey Gladkov <legion@kernel.org>2021-04-22 15:27:14 +0300
committerEric W. Biederman <ebiederm@xmission.com>2021-04-30 22:14:02 +0300
commitd7c9e99aee48e6bc0b427f3e3c658a6aba15001e (patch)
tree61da3b62f597bf4d3658ce6d3198f7e4ae4ddf37 /mm/memfd.c
parentd64696905554e919321e31afc210606653b8f6a4 (diff)
downloadlinux-d7c9e99aee48e6bc0b427f3e3c658a6aba15001e.tar.xz
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 'mm/memfd.c')
-rw-r--r--mm/memfd.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/memfd.c b/mm/memfd.c
index 2647c898990c..081dd33e6a61 100644
--- a/mm/memfd.c
+++ b/mm/memfd.c
@@ -297,9 +297,9 @@ SYSCALL_DEFINE2(memfd_create,
}
if (flags & MFD_HUGETLB) {
- struct user_struct *user = NULL;
+ struct ucounts *ucounts = NULL;
- file = hugetlb_file_setup(name, 0, VM_NORESERVE, &user,
+ file = hugetlb_file_setup(name, 0, VM_NORESERVE, &ucounts,
HUGETLB_ANONHUGE_INODE,
(flags >> MFD_HUGE_SHIFT) &
MFD_HUGE_MASK);