evie/android_kernel_oneplus_msm8998
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Merge "arm64: kernel: Save and restore UAO and addr_limit on exception entry"

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Linux Build Service Account 2017-01-30 07:04:53 -08:00 • committed by Gerrit - the friendly Code Review server
commit fbf5f7c2db
2 changed files with 5 additions and 1 deletions
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3
arch/arm64/kernel/entry.S
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@ -104,6 +104,7 @@
str x20, [sp, #S_ORIG_ADDR_LIMIT]
mov x20, #TASK_SIZE_64
str x20, [tsk, #TI_ADDR_LIMIT]
ALTERNATIVE(nop, SET_PSTATE_UAO(0), ARM64_HAS_UAO, CONFIG_ARM64_UAO)
.endif /* \el == 0 */
mrs x22, elr_el1
mrs x23, spsr_el1
@ -139,6 +140,8 @@
/* Restore the task's original addr_limit. */
ldr x20, [sp, #S_ORIG_ADDR_LIMIT]
str x20, [tsk, #TI_ADDR_LIMIT]
/* No need to restore UAO, it will be restored from SPSR_EL1 */
.endif
ldp x21, x22, [sp, #S_PC] // load ELR, SPSR

3
arch/arm64/mm/fault.c
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@ -291,7 +291,8 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
}
if (permission_fault(esr) && (addr < USER_DS)) {
if (get_fs() == KERNEL_DS)
/* regs->orig_addr_limit may be 0 if we entered from EL0 */
if (regs->orig_addr_limit == KERNEL_DS)
die("Accessing user space memory with fs=KERNEL_DS", regs, esr);
if (!search_exception_tables(regs->pc))