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authorEric Dumazet <edumazet@google.com>2021-04-13 13:33:51 -0700
committerPeter Zijlstra <peterz@infradead.org>2021-04-14 18:04:09 +0200
commit0ed96051531ecc6965f6456d25b19b9b6bdb5c28 (patch)
tree34541425d1efcf840858be87f2972e3acd1ea8a9 /kernel/rseq.c
parent60af388d23889636011488c42763876bcdda3eab (diff)
rseq: Remove redundant access_ok()
After commit 8f2817701492 ("rseq: Use get_user/put_user rather than __get_user/__put_user") we no longer need an access_ok() call from __rseq_handle_notify_resume() Mathieu pointed out the same cleanup can be done in rseq_syscall(). Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Link: https://lkml.kernel.org/r/20210413203352.71350-3-eric.dumazet@gmail.com
Diffstat (limited to 'kernel/rseq.c')
-rw-r--r--kernel/rseq.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/kernel/rseq.c b/kernel/rseq.c
index f020f18f512a..cfe01ab5253c 100644
--- a/kernel/rseq.c
+++ b/kernel/rseq.c
@@ -273,8 +273,6 @@ void __rseq_handle_notify_resume(struct ksignal *ksig, struct pt_regs *regs)
if (unlikely(t->flags & PF_EXITING))
return;
- if (unlikely(!access_ok(t->rseq, sizeof(*t->rseq))))
- goto error;
ret = rseq_ip_fixup(regs);
if (unlikely(ret < 0))
goto error;
@@ -301,8 +299,7 @@ void rseq_syscall(struct pt_regs *regs)
if (!t->rseq)
return;
- if (!access_ok(t->rseq, sizeof(*t->rseq)) ||
- rseq_get_rseq_cs(t, &rseq_cs) || in_rseq_cs(ip, &rseq_cs))
+ if (rseq_get_rseq_cs(t, &rseq_cs) || in_rseq_cs(ip, &rseq_cs))
force_sig(SIGSEGV);
}