This is a note to let you know that I've just added the patch titled
x86/mm/pkeys: Do not skip PKRU register if debug registers are not used
to the 4.7-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:
x86-mm-pkeys-do-not-skip-pkru-register-if-debug-registers-are-not-used.patch
and it can be found in the queue-4.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ba6d018e3d2f6a0fad58a668cadf66b2d1f80f59 Mon Sep 17 00:00:00 2001
From: Nicolas Iooss <nicolas.iooss_linux@xxxxxxx>
Date: Sat, 10 Sep 2016 20:30:45 +0200
Subject: x86/mm/pkeys: Do not skip PKRU register if debug registers are not used
From: Nicolas Iooss <nicolas.iooss_linux@xxxxxxx>
commit ba6d018e3d2f6a0fad58a668cadf66b2d1f80f59 upstream.
__show_regs() fails to dump the PKRU state when the debug registers are in
their default state because there is a return statement on the debug
register state.
Change the logic to report PKRU value even when debug registers are in
their default state.
Fixes:c0b17b5bd4b7 ("x86/mm/pkeys: Dump PKRU with other kernel registers")
Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@xxxxxxx>
Acked-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20160910183045.4618-1-nicolas.iooss_linux@xxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/process_64.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -110,12 +110,13 @@ void __show_regs(struct pt_regs *regs, i
get_debugreg(d7, 7);
/* Only print out debug registers if they are in their non-default state. */
- if ((d0 == 0) && (d1 == 0) && (d2 == 0) && (d3 == 0) &&
- (d6 == DR6_RESERVED) && (d7 == 0x400))
- return;
-
- printk(KERN_DEFAULT "DR0: %016lx DR1: %016lx DR2: %016lx\n", d0, d1, d2);
- printk(KERN_DEFAULT "DR3: %016lx DR6: %016lx DR7: %016lx\n", d3, d6, d7);
+ if (!((d0 == 0) && (d1 == 0) && (d2 == 0) && (d3 == 0) &&
+ (d6 == DR6_RESERVED) && (d7 == 0x400))) {
+ printk(KERN_DEFAULT "DR0: %016lx DR1: %016lx DR2: %016lx\n",
+ d0, d1, d2);
+ printk(KERN_DEFAULT "DR3: %016lx DR6: %016lx DR7: %016lx\n",
+ d3, d6, d7);
+ }
if (boot_cpu_has(X86_FEATURE_OSPKE))
printk(KERN_DEFAULT "PKRU: %08x\n", read_pkru());
Patches currently in stable-queue which might be from nicolas.iooss_linux@xxxxxxx are
queue-4.7/x86-mm-pkeys-do-not-skip-pkru-register-if-debug-registers-are-not-used.patch
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