diff options
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/include/asm/asm-uaccess.h | 9 | ||||
| -rw-r--r-- | arch/arm64/kernel/entry.S | 5 |
2 files changed, 12 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/asm-uaccess.h b/arch/arm64/include/asm/asm-uaccess.h index df411f3e083c..ecd9788cd298 100644 --- a/arch/arm64/include/asm/asm-uaccess.h +++ b/arch/arm64/include/asm/asm-uaccess.h @@ -62,4 +62,13 @@ alternative_if ARM64_ALT_PAN_NOT_UAO alternative_else_nop_endif .endm +/* + * Remove the address tag from a virtual address, if present. + */ + .macro clear_address_tag, dst, addr + tst \addr, #(1 << 55) + bic \dst, \addr, #(0xff << 56) + csel \dst, \dst, \addr, eq + .endm + #endif diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index 43512d4d7df2..b738880350f9 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -428,12 +428,13 @@ el1_da: /* * Data abort handling */ - mrs x0, far_el1 + mrs x3, far_el1 enable_dbg // re-enable interrupts if they were enabled in the aborted context tbnz x23, #7, 1f // PSR_I_BIT enable_irq 1: + clear_address_tag x0, x3 mov x2, sp // struct pt_regs bl do_mem_abort @@ -594,7 +595,7 @@ el0_da: // enable interrupts before calling the main handler enable_dbg_and_irq ct_user_exit - bic x0, x26, #(0xff << 56) + clear_address_tag x0, x26 mov x1, x25 mov x2, sp bl do_mem_abort |