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authorLuck, Tony <tony.luck@intel.com>2018-02-22 09:15:06 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-02-22 10:21:02 -0800
commitbef3efbeb897b56867e271cdbc5f8adaacaeb9cd (patch)
treed3635a816ed945d7790b0202b3b40d6785ac7c8b /include
parent28128c61e08eaeced9cc8ec0e6b5d677b5b94690 (diff)
downloadlinux-bef3efbeb897b56867e271cdbc5f8adaacaeb9cd.tar.bz2
efivarfs: Limit the rate for non-root to read files
Each read from a file in efivarfs results in two calls to EFI (one to get the file size, another to get the actual data). On X86 these EFI calls result in broadcast system management interrupts (SMI) which affect performance of the whole system. A malicious user can loop performing reads from efivarfs bringing the system to its knees. Linus suggested per-user rate limit to solve this. So we add a ratelimit structure to "user_struct" and initialize it for the root user for no limit. When allocating user_struct for other users we set the limit to 100 per second. This could be used for other places that want to limit the rate of some detrimental user action. In efivarfs if the limit is exceeded when reading, we take an interruptible nap for 50ms and check the rate limit again. Signed-off-by: Tony Luck <tony.luck@intel.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/sched/user.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/sched/user.h b/include/linux/sched/user.h
index 0dcf4e480ef7..96fe289c4c6e 100644
--- a/include/linux/sched/user.h
+++ b/include/linux/sched/user.h
@@ -4,6 +4,7 @@
#include <linux/uidgid.h>
#include <linux/atomic.h>
+#include <linux/ratelimit.h>
struct key;
@@ -41,6 +42,9 @@ struct user_struct {
defined(CONFIG_NET)
atomic_long_t locked_vm;
#endif
+
+ /* Miscellaneous per-user rate limit */
+ struct ratelimit_state ratelimit;
};
extern int uids_sysfs_init(void);