This is a note to let you know that I've just added the patch titled
parisc: Fix vDSO signal breakage on 32-bit kernel
to the 5.18-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:
parisc-fix-vdso-signal-breakage-on-32-bit-kernel.patch
and it can be found in the queue-5.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From aa78fa905b4431c432071a878da99c2b37fc0e79 Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@xxxxxx>
Date: Fri, 1 Jul 2022 09:00:41 +0200
Subject: parisc: Fix vDSO signal breakage on 32-bit kernel
From: Helge Deller <deller@xxxxxx>
commit aa78fa905b4431c432071a878da99c2b37fc0e79 upstream.
Addition of vDSO support for parisc in kernel v5.18 suddenly broke glibc
signal testcases on a 32-bit kernel.
The trampoline code (sigtramp.S) which is mapped into userspace includes
an offset to the context data on the stack, which is used by gdb and
glibc to get access to registers.
In a 32-bit kernel we used by mistake the offset into the compat context
(which is valid on a 64-bit kernel only) instead of the offset into the
"native" 32-bit context.
Reported-by: John David Anglin <dave.anglin@xxxxxxxx>
Tested-by: John David Anglin <dave.anglin@xxxxxxxx>
Fixes: df24e1783e6e ("parisc: Add vDSO support")
CC: stable@xxxxxxxxxxxxxxx # 5.18
Signed-off-by: Helge Deller <deller@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/parisc/kernel/asm-offsets.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/parisc/kernel/asm-offsets.c b/arch/parisc/kernel/asm-offsets.c
index 2673d57eeb00..94652e13c260 100644
--- a/arch/parisc/kernel/asm-offsets.c
+++ b/arch/parisc/kernel/asm-offsets.c
@@ -224,8 +224,13 @@ int main(void)
BLANK();
DEFINE(ASM_SIGFRAME_SIZE, PARISC_RT_SIGFRAME_SIZE);
DEFINE(SIGFRAME_CONTEXT_REGS, offsetof(struct rt_sigframe, uc.uc_mcontext) - PARISC_RT_SIGFRAME_SIZE);
+#ifdef CONFIG_64BIT
DEFINE(ASM_SIGFRAME_SIZE32, PARISC_RT_SIGFRAME_SIZE32);
DEFINE(SIGFRAME_CONTEXT_REGS32, offsetof(struct compat_rt_sigframe, uc.uc_mcontext) - PARISC_RT_SIGFRAME_SIZE32);
+#else
+ DEFINE(ASM_SIGFRAME_SIZE32, PARISC_RT_SIGFRAME_SIZE);
+ DEFINE(SIGFRAME_CONTEXT_REGS32, offsetof(struct rt_sigframe, uc.uc_mcontext) - PARISC_RT_SIGFRAME_SIZE);
+#endif
BLANK();
DEFINE(ICACHE_BASE, offsetof(struct pdc_cache_info, ic_base));
DEFINE(ICACHE_STRIDE, offsetof(struct pdc_cache_info, ic_stride));
--
2.37.0
Patches currently in stable-queue which might be from deller@xxxxxx are
queue-5.18/parisc-unaligned-fix-emulate_ldw-breakage.patch
queue-5.18/parisc-fix-vdso-signal-breakage-on-32-bit-kernel.patch
