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authorMathieu Desnoyers <mathieu.desnoyers@efficios.com>2019-12-11 11:17:11 -0500
committerIngo Molnar <mingo@kernel.org>2019-12-25 10:41:20 +0100
commit66528a4575eee9f5a5270219894ab6178f146e84 (patch)
treeaa71eb05f6014332559d4b4aa09bde8862664372 /kernel/rseq.c
parent46cf053efec6a3a5f343fead837777efe8252a46 (diff)
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rseq: Reject unknown flags on rseq unregister
It is preferrable to reject unknown flags within rseq unregistration rather than to ignore them. It is an oversight caused by the fact that the check for unknown flags is after the rseq unregister flag check. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20191211161713.4490-2-mathieu.desnoyers@efficios.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/rseq.c')
-rw-r--r--kernel/rseq.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/rseq.c b/kernel/rseq.c
index 27c48eb7de40..a4f86a9d6937 100644
--- a/kernel/rseq.c
+++ b/kernel/rseq.c
@@ -310,6 +310,8 @@ SYSCALL_DEFINE4(rseq, struct rseq __user *, rseq, u32, rseq_len,
int ret;
if (flags & RSEQ_FLAG_UNREGISTER) {
+ if (flags & ~RSEQ_FLAG_UNREGISTER)
+ return -EINVAL;
/* Unregister rseq for current thread. */
if (current->rseq != rseq || !current->rseq)
return -EINVAL;