This is a note to let you know that I've just added the patch titled
riscv: fix a nasty sigreturn bug...
to the 5.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
riscv-fix-a-nasty-sigreturn-bug.patch
and it can be found in the queue-5.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 762df359aa5849e010ef04c3ed79d57588ce17d9 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Date: Fri, 24 Sep 2021 01:55:27 +0000
Subject: riscv: fix a nasty sigreturn bug...
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
commit 762df359aa5849e010ef04c3ed79d57588ce17d9 upstream.
riscv has an equivalent of arm bug fixed by 653d48b22166 ("arm: fix
really nasty sigreturn bug"); if signal gets caught by an interrupt that
hits when we have the right value in a0 (-513), *and* another signal
gets delivered upon sigreturn() (e.g. included into the blocked mask for
the first signal and posted while the handler had been running), the
syscall restart logics will see regs->cause equal to EXC_SYSCALL (we are
in a syscall, after all) and a0 already restored to its original value
(-513, which happens to be -ERESTARTNOINTR) and assume that we need to
apply the usual syscall restart logics.
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Fixes: e2c0cdfba7f6 ("RISC-V: User-facing API")
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/YxJEiSq%2FCGaL6Gm9@ZenIV/
Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/riscv/kernel/signal.c | 2 ++
1 file changed, 2 insertions(+)
--- a/arch/riscv/kernel/signal.c
+++ b/arch/riscv/kernel/signal.c
@@ -124,6 +124,8 @@ SYSCALL_DEFINE0(rt_sigreturn)
if (restore_altstack(&frame->uc.uc_stack))
goto badframe;
+ regs->cause = -1UL;
+
return regs->a0;
badframe:
Patches currently in stable-queue which might be from viro@xxxxxxxxxxxxxxxxxx are
queue-5.19/riscv-fix-a-nasty-sigreturn-bug.patch
