#ifdef CONFIG_PPC_PKEY
+extern u64 __ro_after_init default_uamor;
+extern u64 __ro_after_init default_amr;
+extern u64 __ro_after_init default_iamr;
+
#include <asm/mmu.h>
#include <asm/ptrace.h>
-/*
- * For kernel thread that doesn't have thread.regs return
- * default AMR/IAMR values.
+/* usage of kthread_use_mm() should inherit the
+ * AMR value of the operating address space. But, the AMR value is
+ * thread-specific and we inherit the address space and not thread
+ * access restrictions. Because of this ignore AMR value when accessing
+ * userspace via kernel thread.
*/
static inline u64 current_thread_amr(void)
{
if (current->thread.regs)
return current->thread.regs->amr;
- return AMR_KUAP_BLOCKED;
+ return default_amr;
}
static inline u64 current_thread_iamr(void)
{
if (current->thread.regs)
return current->thread.regs->iamr;
- return AMR_KUEP_BLOCKED;
+ return default_iamr;
}
#endif /* CONFIG_PPC_PKEY */
#include <asm/book3s/64/hash-pkey.h>
-extern u64 __ro_after_init default_uamor;
-extern u64 __ro_after_init default_amr;
-extern u64 __ro_after_init default_iamr;
-
static inline u64 vmflag_to_pte_pkey_bits(u64 vm_flags)
{
if (!mmu_has_feature(MMU_FTR_PKEY))
u64 default_amr __ro_after_init = ~0x0UL;
u64 default_iamr __ro_after_init = 0x5555555555555555UL;
u64 default_uamor __ro_after_init;
+EXPORT_SYMBOL(default_amr);
/*
* Key used to implement PROT_EXEC mmap. Denies READ/WRITE
* We pick key 2 because 0 is special key and 1 is reserved as per ISA.