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 4.8-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-4.8 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-4.8/x86-mm-pkeys-do-not-skip-pkru-register-if-debug-registers-are-not-used.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html