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rseq: Remove redundant access_ok() 

After commit 8f28177014 ("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
This commit is contained in:
Eric Dumazet 2021-04-13 13:33:51 -07:00 committed by Peter Zijlstra
parent 60af388d23
commit 0ed9605153
1 changed files with 1 additions and 4 deletions
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5
kernel/rseq.c
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@ -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);
}