Messages in this thread Patch in this message | | | Subject | [PATCH 21/34] x86, pkeys: dump PKRU with other kernel registers | From | Dave Hansen <> | Date | Thu, 03 Dec 2015 17:14:53 -0800 |
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From: Dave Hansen <dave.hansen@linux.intel.com>
I'm a bit ambivalent about whether this is needed or not.
Protection Keys never affect kernel mappings. But, they can affect whether the kernel will fault when it touches a user mapping. But, the kernel doesn't touch user mappings without some careful choreography and these accesses don't generally result in oopses.
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> ---
b/arch/x86/kernel/process_64.c | 2 ++ 1 file changed, 2 insertions(+)
diff -puN arch/x86/kernel/process_64.c~pkeys-30-kernel-error-dumps arch/x86/kernel/process_64.c --- a/arch/x86/kernel/process_64.c~pkeys-30-kernel-error-dumps 2015-12-03 16:21:27.874773264 -0800 +++ b/arch/x86/kernel/process_64.c 2015-12-03 16:21:27.877773400 -0800 @@ -116,6 +116,8 @@ void __show_regs(struct pt_regs *regs, i 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()); } void release_thread(struct task_struct *dead_task) _
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