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.
Should we dump out PKRU like this in our oopses?
---
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 2015-09-16
10:48:18.424290612 -0700
+++ b/arch/x86/kernel/process_64.c 2015-09-16 10:48:18.427290748 -0700
@@ -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)
_
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
