From: Sven Schnelle <svens@stackframe.org>
To: Helge Deller <deller@gmx.de>
Cc: linux-parisc@vger.kernel.org, Sven Schnelle <svens@stackframe.org>
Subject: [PATCH] parisc: fix frame pointer in ftrace_regs_caller()
Date: Wed, 30 Oct 2019 09:17:18 +0100 [thread overview]
Message-ID: <20191030081718.9445-1-svens@stackframe.org> (raw)
The current code in ftrace_regs_caller() doesn't assign
%r3 to contain the address of the current frame. This
is hidden if the kernel is compiled with FRAME_POINTER,
but without it just crashes because it tries to dereference
an arbitrary address. Fix this by always setting %r3 to the
current stack frame.
Signed-off-by: Sven Schnelle <svens@stackframe.org>
---
arch/parisc/kernel/entry.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S
index 1d1d748c227f..b96d74496977 100644
--- a/arch/parisc/kernel/entry.S
+++ b/arch/parisc/kernel/entry.S
@@ -2125,7 +2125,7 @@ ftrace_regs_caller:
copy %rp, %r26
LDREG -FTRACE_FRAME_SIZE-PT_SZ_ALGN(%sp), %r25
ldo -8(%r25), %r25
- copy %r3, %arg2
+ ldo -FTRACE_FRAME_SIZE(%r1), %arg2
b,l ftrace_function_trampoline, %rp
copy %r1, %arg3 /* struct pt_regs */
--
2.23.0
reply other threads:[~2019-10-30 8:42 UTC|newest]
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