diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/userfaultfd.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c index f5de1e726356..3b30301c90ec 100644 --- a/fs/userfaultfd.c +++ b/fs/userfaultfd.c @@ -30,6 +30,8 @@ #include <linux/security.h> #include <linux/hugetlb.h> +int sysctl_unprivileged_userfaultfd __read_mostly = 1; + static struct kmem_cache *userfaultfd_ctx_cachep __read_mostly; enum userfaultfd_state { @@ -1930,6 +1932,9 @@ SYSCALL_DEFINE1(userfaultfd, int, flags) struct userfaultfd_ctx *ctx; int fd; + if (!sysctl_unprivileged_userfaultfd && !capable(CAP_SYS_PTRACE)) + return -EPERM; + BUG_ON(!current->mm); /* Check the UFFD_* constants for consistency. */ |