From: Edward AD <twuufnxlz@gmail.com>
To: syzbot+8d2757d62d403b2d9275@syzkaller.appspotmail.com
Cc: gregkh@linuxfoundation.org, jirislaby@kernel.org,
linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org,
syzkaller-bugs@googlegroups.com
Subject: [PATCH] riscv: fix out of bounds in walk_stackframe
Date: Tue, 26 Sep 2023 18:59:50 +0800 [thread overview]
Message-ID: <20230926105949.1025995-2-twuufnxlz@gmail.com> (raw)
In-Reply-To: <0000000000000170df0605ccf91a@google.com>
Increase the check on the frame after assigning its value. This is to prevent
frame access from crossing boundaries.
Reported-and-tested-by: syzbot+8d2757d62d403b2d9275@syzkaller.appspotmail.com
Signed-off-by: Edward AD <twuufnxlz@gmail.com>
---
arch/riscv/kernel/stacktrace.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/riscv/kernel/stacktrace.c b/arch/riscv/kernel/stacktrace.c
index 64a9c093aef9..53bd18672329 100644
--- a/arch/riscv/kernel/stacktrace.c
+++ b/arch/riscv/kernel/stacktrace.c
@@ -54,6 +54,8 @@ void notrace walk_stackframe(struct task_struct *task, struct pt_regs *regs,
break;
/* Unwind stack frame */
frame = (struct stackframe *)fp - 1;
+ if (!virt_addr_valid(frame))
+ break;
sp = fp;
if (regs && (regs->epc == pc) && (frame->fp & 0x7)) {
fp = frame->ra;
--
2.25.1
next prev parent reply other threads:[~2023-09-26 11:00 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-20 16:36 [syzbot] [serial?] KASAN: stack-out-of-bounds Read in sched_show_task syzbot
2023-09-26 10:59 ` Edward AD [this message]
2023-09-26 11:12 ` [PATCH] riscv: fix out of bounds in walk_stackframe Conor Dooley
2023-09-26 11:43 ` Edward AD
2023-09-26 11:49 ` Greg KH
2023-09-28 8:02 ` Alexandre Ghiti
2023-09-28 8:15 ` Alexandre Ghiti
2023-09-28 23:12 ` Edward AD
2023-09-29 6:04 ` Greg KH
2023-09-29 23:05 ` [PATCH] Test for riscv fixes Edward AD
2023-09-30 6:13 ` Greg KH
2023-09-30 8:24 ` Conor Dooley
2023-10-02 10:20 ` Aleksandr Nogikh
2023-09-29 6:05 ` [PATCH] riscv: fix out of bounds in walk_stackframe Greg KH
2023-09-29 8:25 ` Alexandre Ghiti
2023-09-29 23:05 ` [PATCH] Test for riscv fixes Edward AD
2023-10-02 7:13 ` Alexandre Ghiti
2023-10-02 13:41 ` Mark Rutland
2023-10-06 11:38 ` Alexandre Ghiti
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