diff options
| -rw-r--r-- | include/linux/swap.h | 3 | ||||
| -rw-r--r-- | mm/swapfile.c | 3 |
2 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/swap.h b/include/linux/swap.h index b86b5c20617d..8dc0ea7caf02 100644 --- a/include/linux/swap.h +++ b/include/linux/swap.h @@ -21,6 +21,9 @@ struct bio; #define SWAP_FLAG_PRIO_SHIFT 0 #define SWAP_FLAG_DISCARD 0x10000 /* discard swap cluster after use */ +#define SWAP_FLAGS_VALID (SWAP_FLAG_PRIO_MASK | SWAP_FLAG_PREFER | \ + SWAP_FLAG_DISCARD) + static inline int current_is_kswapd(void) { return current->flags & PF_KSWAPD; diff --git a/mm/swapfile.c b/mm/swapfile.c index dae42f380d6e..fafc26d1b1dc 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -2022,6 +2022,9 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) struct page *page = NULL; struct inode *inode = NULL; + if (swap_flags & ~SWAP_FLAGS_VALID) + return -EINVAL; + if (!capable(CAP_SYS_ADMIN)) return -EPERM; |