From 04946fb60fb157faafa01658dff3131d49f49ccb Mon Sep 17 00:00:00 2001 From: Russell King Date: Tue, 18 Oct 2016 10:24:49 +0100 Subject: [PATCH] ARM: fix oops when using older ARMv4T CPUs Alexander Shiyan reports that CLPS711x fails at boot time in the data exception handler due to a NULL pointer dereference. This is caused by the late-v4t abort handler overwriting R9 (which becomes zero). Fix this by making the abort handler save and restore R9. Unable to handle kernel NULL pointer dereference at virtual address 00000008 pgd = c3b58000 [00000008] *pgd=800000000, *pte=00000000, *ppte=feff4140 Internal error: Oops: 63c11817 [#1] PREEMPT ARM CPU: 0 PID: 448 Comm: ash Not tainted 4.8.1+ #1 Hardware name: Cirrus Logic CLPS711X (Device Tree Support) task: c39e03a0 ti: c3b4e000 task.ti: c3b4e000 PC is at __dabt_svc+0x4c/0x60 LR is at do_page_fault+0x144/0x2ac pc : [] lr : [] psr: 60000093 sp : c3b4fe6c ip : 00000001 fp : b6f1bf88 r10: c387a5a0 r9 : 00000000 r8 : e4e0e001 r7 : bee3ef83 r6 : 00100000 r5 : 80000013 r4 : c022fcf8 r3 : 00000000 r2 : 00000008 r1 : bf000000 r0 : 00000000 Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment user Control: 0000217f Table: c3b58055 DAC: 00000055 Process ash (pid: 448, stack limit = 0xc3b4e190) Stack: (0xc3b4fe6c to 0xc3b50000) fe60: bee3ef83 c05168d1 ffffffff 00000000 c3adfe80 fe80: c3a03300 00000000 c3b4fed0 c3a03400 bee3ef83 c387a5a0 b6f1bf88 00000001 fea0: c3b4febc 00000076 c022fcf8 80000013 ffffffff 0000003f bf000000 bee3ef83 fec0: 00000004 00000000 c3adfe80 c00e432c 00000812 00000005 00000001 00000006 fee0: b6f1b000 00000000 00010000 0003c944 0004d000 0004d439 00010000 b6f1b000 ff00: 00000005 00000000 00015ecc c3b4fed0 0000000a 00000000 00000000 c00a1dc0 ff20: befff000 c3a03300 c3b4e000 c0507cd8 c0508024 fffffff8 c3a03300 00000000 ff40: c0516a58 c00a35bc c39e03a0 000001c0 bea84ce8 0004e008 c3b3a000 c00a3ac0 ff60: c3b40374 c3b3a000 bea84d11 00000000 c0500188 bea84d11 bea84ce8 00000001 ff80: 0000000b c000a304 c3b4e000 00000000 bea84ce4 c00a3cd0 00000000 bea84d11 ffa0: bea84ce8 c000a160 bea84d11 bea84ce8 bea84d11 bea84ce8 0004e008 0004d450 ffc0: bea84d11 bea84ce8 00000001 0000000b b6f45ee4 00000000 b6f5ff70 bea84ce4 ffe0: b6f2f130 bea84cb0 b6f2f194 b6ef29f4 a0000010 bea84d11 02c7cffa 02c7cffd [] (__dabt_svc) from [] (__copy_to_user_std+0xf8/0x330) [] (__copy_to_user_std) from [] +(load_elf_binary+0x920/0x107c) [] (load_elf_binary) from [] +(search_binary_handler+0x80/0x16c) [] (search_binary_handler) from [] +(do_execveat_common+0x418/0x600) [] (do_execveat_common) from [] (do_execve+0x28/0x30) [] (do_execve) from [] (ret_fast_syscall+0x0/0x30) Code: e1a0200d eb00136b e321f093 e59d104c (e5891008) ---[ end trace 4b4f8086ebef98c5 ]--- Fixes: e6978e4bf181 ("ARM: save and reset the address limit when entering an exception") Reported-by: Alexander Shiyan Tested-by: Alexander Shiyan Signed-off-by: Russell King --- arch/arm/mm/abort-lv4t.S | 34 ++++++++++++++++++++++++---------- 1 file changed, 24 insertions(+), 10 deletions(-) diff --git a/arch/arm/mm/abort-lv4t.S b/arch/arm/mm/abort-lv4t.S index 6d8e8e3365d1..4cdfab31a0b6 100644 --- a/arch/arm/mm/abort-lv4t.S +++ b/arch/arm/mm/abort-lv4t.S @@ -7,7 +7,7 @@ * : r4 = aborted context pc * : r5 = aborted context psr * - * Returns : r4-r5, r10-r11, r13 preserved + * Returns : r4-r5, r9-r11, r13 preserved * * Purpose : obtain information about current aborted instruction. * Note: we read user space. This means we might cause a data @@ -48,7 +48,10 @@ ENTRY(v4t_late_abort) /* c */ b do_DataAbort @ ldc rd, [rn], #m @ Same as ldr rd, [rn], #m /* d */ b do_DataAbort @ ldc rd, [rn, #m] /* e */ b .data_unknown -/* f */ +/* f */ b .data_unknown + +.data_unknown_r9: + ldr r9, [sp], #4 .data_unknown: @ Part of jumptable mov r0, r4 mov r1, r8 @@ -57,6 +60,7 @@ ENTRY(v4t_late_abort) .data_arm_ldmstm: tst r8, #1 << 21 @ check writeback bit beq do_DataAbort @ no writeback -> no fixup + str r9, [sp, #-4]! mov r7, #0x11 orr r7, r7, #0x1100 and r6, r8, r7 @@ -75,12 +79,14 @@ ENTRY(v4t_late_abort) subne r7, r7, r6, lsl #2 @ Undo increment addeq r7, r7, r6, lsl #2 @ Undo decrement str r7, [r2, r9, lsr #14] @ Put register 'Rn' + ldr r9, [sp], #4 b do_DataAbort .data_arm_lateldrhpre: tst r8, #1 << 21 @ Check writeback bit beq do_DataAbort @ No writeback -> no fixup .data_arm_lateldrhpost: + str r9, [sp, #-4]! and r9, r8, #0x00f @ get Rm / low nibble of immediate value tst r8, #1 << 22 @ if (immediate offset) andne r6, r8, #0xf00 @ { immediate high nibble @@ -93,6 +99,7 @@ ENTRY(v4t_late_abort) subne r7, r7, r6 @ Undo incrmenet addeq r7, r7, r6 @ Undo decrement str r7, [r2, r9, lsr #14] @ Put register 'Rn' + ldr r9, [sp], #4 b do_DataAbort .data_arm_lateldrpreconst: @@ -101,12 +108,14 @@ ENTRY(v4t_late_abort) .data_arm_lateldrpostconst: movs r6, r8, lsl #20 @ Get offset beq do_DataAbort @ zero -> no fixup + str r9, [sp, #-4]! and r9, r8, #15 << 16 @ Extract 'n' from instruction ldr r7, [r2, r9, lsr #14] @ Get register 'Rn' tst r8, #1 << 23 @ Check U bit subne r7, r7, r6, lsr #20 @ Undo increment addeq r7, r7, r6, lsr #20 @ Undo decrement str r7, [r2, r9, lsr #14] @ Put register 'Rn' + ldr r9, [sp], #4 b do_DataAbort .data_arm_lateldrprereg: @@ -115,6 +124,7 @@ ENTRY(v4t_late_abort) .data_arm_lateldrpostreg: and r7, r8, #15 @ Extract 'm' from instruction ldr r6, [r2, r7, lsl #2] @ Get register 'Rm' + str r9, [sp, #-4]! mov r9, r8, lsr #7 @ get shift count ands r9, r9, #31 and r7, r8, #0x70 @ get shift type @@ -126,33 +136,33 @@ ENTRY(v4t_late_abort) b .data_arm_apply_r6_and_rn b .data_arm_apply_r6_and_rn @ 1: LSL #0 nop - b .data_unknown @ 2: MUL? + b .data_unknown_r9 @ 2: MUL? nop - b .data_unknown @ 3: MUL? + b .data_unknown_r9 @ 3: MUL? nop mov r6, r6, lsr r9 @ 4: LSR #!0 b .data_arm_apply_r6_and_rn mov r6, r6, lsr #32 @ 5: LSR #32 b .data_arm_apply_r6_and_rn - b .data_unknown @ 6: MUL? + b .data_unknown_r9 @ 6: MUL? nop - b .data_unknown @ 7: MUL? + b .data_unknown_r9 @ 7: MUL? nop mov r6, r6, asr r9 @ 8: ASR #!0 b .data_arm_apply_r6_and_rn mov r6, r6, asr #32 @ 9: ASR #32 b .data_arm_apply_r6_and_rn - b .data_unknown @ A: MUL? + b .data_unknown_r9 @ A: MUL? nop - b .data_unknown @ B: MUL? + b .data_unknown_r9 @ B: MUL? nop mov r6, r6, ror r9 @ C: ROR #!0 b .data_arm_apply_r6_and_rn mov r6, r6, rrx @ D: RRX b .data_arm_apply_r6_and_rn - b .data_unknown @ E: MUL? + b .data_unknown_r9 @ E: MUL? nop - b .data_unknown @ F: MUL? + b .data_unknown_r9 @ F: MUL? .data_thumb_abort: ldrh r8, [r4] @ read instruction @@ -190,6 +200,7 @@ ENTRY(v4t_late_abort) .data_thumb_pushpop: tst r8, #1 << 10 beq .data_unknown + str r9, [sp, #-4]! and r6, r8, #0x55 @ hweight8(r8) + R bit and r9, r8, #0xaa add r6, r6, r9, lsr #1 @@ -204,9 +215,11 @@ ENTRY(v4t_late_abort) addeq r7, r7, r6, lsl #2 @ increment SP if PUSH subne r7, r7, r6, lsl #2 @ decrement SP if POP str r7, [r2, #13 << 2] + ldr r9, [sp], #4 b do_DataAbort .data_thumb_ldmstm: + str r9, [sp, #-4]! and r6, r8, #0x55 @ hweight8(r8) and r9, r8, #0xaa add r6, r6, r9, lsr #1 @@ -219,4 +232,5 @@ ENTRY(v4t_late_abort) and r6, r6, #15 @ number of regs to transfer sub r7, r7, r6, lsl #2 @ always decrement str r7, [r2, r9, lsr #6] + ldr r9, [sp], #4 b do_DataAbort -- 2.34.1