This is a note to let you know that I've just added the patch titled
MIPS: ptrace: Fix PTRACE_PEEKUSR requests for 64-bit FGRs
to the 4.14-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-ptrace-fix-ptrace_peekusr-requests-for-64-bit-fgrs.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c7e814628df65f424fe197dde73bfc67e4a244d7 Mon Sep 17 00:00:00 2001
From: "Maciej W. Rozycki" <macro@xxxxxxxx>
Date: Wed, 16 May 2018 16:39:58 +0100
Subject: MIPS: ptrace: Fix PTRACE_PEEKUSR requests for 64-bit FGRs
From: Maciej W. Rozycki <macro@xxxxxxxx>
commit c7e814628df65f424fe197dde73bfc67e4a244d7 upstream.
Use 64-bit accesses for 64-bit floating-point general registers with
PTRACE_PEEKUSR, removing the truncation of their upper halves in the
FR=1 mode, caused by commit bbd426f542cb ("MIPS: Simplify FP context
access"), which inadvertently switched them to using 32-bit accesses.
The PTRACE_POKEUSR side is fine as it's never been broken and continues
using 64-bit accesses.
Fixes: bbd426f542cb ("MIPS: Simplify FP context access")
Signed-off-by: Maciej W. Rozycki <macro@xxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: <stable@xxxxxxxxxxxxxxx> # 3.15+
Patchwork: https://patchwork.linux-mips.org/patch/19334/
Signed-off-by: James Hogan <jhogan@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/kernel/ptrace.c | 2 +-
arch/mips/kernel/ptrace32.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -809,7 +809,7 @@ long arch_ptrace(struct task_struct *chi
break;
}
#endif
- tmp = get_fpr32(&fregs[addr - FPR_BASE], 0);
+ tmp = get_fpr64(&fregs[addr - FPR_BASE], 0);
break;
case PC:
tmp = regs->cp0_epc;
--- a/arch/mips/kernel/ptrace32.c
+++ b/arch/mips/kernel/ptrace32.c
@@ -108,7 +108,7 @@ long compat_arch_ptrace(struct task_stru
addr & 1);
break;
}
- tmp = get_fpr32(&fregs[addr - FPR_BASE], 0);
+ tmp = get_fpr64(&fregs[addr - FPR_BASE], 0);
break;
case PC:
tmp = regs->cp0_epc;
Patches currently in stable-queue which might be from macro@xxxxxxxx are
queue-4.14/mips-ptrace-fix-ptrace_peekusr-requests-for-64-bit-fgrs.patch
queue-4.14/mips-prctl-disallow-fre-without-fr-with-pr_set_fp_mode-requests.patch
