This is a note to let you know that I've just added the patch titled
MIPS: Send SIGILL for BPOSGE32 in `__compute_return_epc_for_insn'
to the 3.18-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:
mips-send-sigill-for-bposge32-in-__compute_return_epc_for_insn.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7b82c1058ac1f8f8b9f2b8786b1f710a57a870a8 Mon Sep 17 00:00:00 2001
From: "Maciej W. Rozycki" <macro@xxxxxxxxxx>
Date: Fri, 16 Jun 2017 00:08:29 +0100
Subject: MIPS: Send SIGILL for BPOSGE32 in `__compute_return_epc_for_insn'
From: Maciej W. Rozycki <macro@xxxxxxxxxx>
commit 7b82c1058ac1f8f8b9f2b8786b1f710a57a870a8 upstream.
Fix commit e50c0a8fa60d ("Support the MIPS32 / MIPS64 DSP ASE.") and
send SIGILL rather than SIGBUS whenever an unimplemented BPOSGE32 DSP
ASE instruction has been encountered in `__compute_return_epc_for_insn'
as our Reserved Instruction exception handler would in response to an
attempt to actually execute the instruction. Sending SIGBUS only makes
sense for the unaligned PC case, since moved to `__compute_return_epc'.
Adjust function documentation accordingly, correct formatting and use
`pr_info' rather than `printk' as the other exit path already does.
Fixes: e50c0a8fa60d ("Support the MIPS32 / MIPS64 DSP ASE.")
Signed-off-by: Maciej W. Rozycki <macro@xxxxxxxxxx>
Cc: James Hogan <james.hogan@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx # 2.6.14+
Patchwork: https://patchwork.linux-mips.org/patch/16396/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/kernel/branch.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
--- a/arch/mips/kernel/branch.c
+++ b/arch/mips/kernel/branch.c
@@ -396,7 +396,7 @@ int __MIPS16e_compute_return_epc(struct
*
* @regs: Pointer to pt_regs
* @insn: branch instruction to decode
- * @returns: -EFAULT on error and forces SIGBUS, and on success
+ * @returns: -EFAULT on error and forces SIGILL, and on success
* returns 0 or BRANCH_LIKELY_TAKEN as appropriate after
* evaluating the branch.
*/
@@ -633,8 +633,9 @@ int __compute_return_epc_for_insn(struct
return ret;
sigill:
- printk("%s: DSP branch but not DSP ASE - sending SIGBUS.\n", current->comm);
- force_sig(SIGBUS, current);
+ pr_info("%s: DSP branch but not DSP ASE - sending SIGILL.\n",
+ current->comm);
+ force_sig(SIGILL, current);
return -EFAULT;
}
EXPORT_SYMBOL_GPL(__compute_return_epc_for_insn);
Patches currently in stable-queue which might be from macro@xxxxxxxxxx are
queue-3.18/mips-send-sigill-for-bposge32-in-__compute_return_epc_for_insn.patch
queue-3.18/mips-actually-decode-jalx-in-__compute_return_epc_for_insn.patch
queue-3.18/mips-fix-unaligned-pc-interpretation-in-compute_return_epc.patch
queue-3.18/mips-math-emu-prevent-wrong-isa-mode-instruction-emulation.patch