The following commit has been merged into the sched/core branch of tip:
Commit-ID: 0ed96051531ecc6965f6456d25b19b9b6bdb5c28
Gitweb: https://git.kernel.org/tip/0ed96051531ecc6965f6456d25b19b9b6bdb5c28
Author: Eric Dumazet <edumazet@xxxxxxxxxx>
AuthorDate: Tue, 13 Apr 2021 13:33:51 -07:00
Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Wed, 14 Apr 2021 18:04:09 +02:00
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@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/20210413203352.71350-3-eric.dumazet@xxxxxxxxx
---
kernel/rseq.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/kernel/rseq.c b/kernel/rseq.c
index f020f18..cfe01ab 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);
}
|