diff options
| author | Catalin Marinas <catalin.marinas@arm.com> | 2014-04-22 17:14:29 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2014-04-25 13:06:38 +0200 |
| commit | 1417a6b8dc4db73055be9a3aa288b050e9dc06ab (patch) | |
| tree | 82fe7a3cb59ff82ddb74a8ebc6ff2d2e9237733b /arch | |
| parent | ARM: 8035/1: Disable preemption in crunch_task_enable() (diff) | |
| download | linux-1417a6b8dc4db73055be9a3aa288b050e9dc06ab.tar.xz linux-1417a6b8dc4db73055be9a3aa288b050e9dc06ab.zip | |
ARM: 8036/1: Enable IRQs before attempting to read user space in __und_usr
The Undef abort handler in the kernel reads the undefined instruction
from user space. If the page table was modified from another CPU, the
user access could fail and do_page_fault() will be executed with
interrupts disabled. This can potentially deadlock on ARM11MPCore or on
Cortex-A15 with erratum 798181 workaround enabled (both implying IPI for
TLB maintenance with page table lock held).
This patch enables the IRQs in __und_usr before attempting to read the
instruction from user space.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Arun KS <getarunks@gmail.com>
Cc: Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ryan Mallon <rmallon@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/kernel/entry-armv.S | 11 | ||||
| -rw-r--r-- | arch/arm/kernel/iwmmxt.S | 2 | ||||
| -rw-r--r-- | arch/arm/mach-ep93xx/crunch-bits.S | 2 | ||||
| -rw-r--r-- | arch/arm/vfp/entry.S | 3 |
4 files changed, 10 insertions, 8 deletions
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S index 1879e8dd2acc..5fc897cf409b 100644 --- a/arch/arm/kernel/entry-armv.S +++ b/arch/arm/kernel/entry-armv.S @@ -413,6 +413,11 @@ __und_usr: @ adr r9, BSYM(ret_from_exception) + @ IRQs must be enabled before attempting to read the instruction from + @ user space since that could cause a page/translation fault if the + @ page table was modified by another CPU. + enable_irq + tst r3, #PSR_T_BIT @ Thumb mode? bne __und_usr_thumb sub r4, r2, #4 @ ARM instr at LR - 4 @@ -517,7 +522,7 @@ ENDPROC(__und_usr) * r9 = normal "successful" return address * r10 = this threads thread_info structure * lr = unrecognised instruction return address - * IRQs disabled, FIQs enabled. + * IRQs enabled, FIQs enabled. */ @ @ Fall-through from Thumb-2 __und_usr @@ -624,7 +629,6 @@ call_fpe: #endif do_fpe: - enable_irq ldr r4, .LCfp add r10, r10, #TI_FPSTATE @ r10 = workspace ldr pc, [r4] @ Call FP module USR entry point @@ -652,8 +656,7 @@ __und_usr_fault_32: b 1f __und_usr_fault_16: mov r1, #2 -1: enable_irq - mov r0, sp +1: mov r0, sp adr lr, BSYM(ret_from_exception) b __und_fault ENDPROC(__und_usr_fault_32) diff --git a/arch/arm/kernel/iwmmxt.S b/arch/arm/kernel/iwmmxt.S index fcb33a70a35f..4bb029ea8917 100644 --- a/arch/arm/kernel/iwmmxt.S +++ b/arch/arm/kernel/iwmmxt.S @@ -62,7 +62,7 @@ * r9 = ret_from_exception * lr = undefined instr exit * - * called from prefetch exception handler with interrupts disabled + * called from prefetch exception handler with interrupts enabled */ ENTRY(iwmmxt_task_enable) diff --git a/arch/arm/mach-ep93xx/crunch-bits.S b/arch/arm/mach-ep93xx/crunch-bits.S index eaa5e34729d3..e96923a3017b 100644 --- a/arch/arm/mach-ep93xx/crunch-bits.S +++ b/arch/arm/mach-ep93xx/crunch-bits.S @@ -63,7 +63,7 @@ * r9 = ret_from_exception * lr = undefined instr exit * - * called from prefetch exception handler with interrupts disabled + * called from prefetch exception handler with interrupts enabled */ ENTRY(crunch_task_enable) inc_preempt_count r10, r3 diff --git a/arch/arm/vfp/entry.S b/arch/arm/vfp/entry.S index f0759e70fb86..fe6ca574d093 100644 --- a/arch/arm/vfp/entry.S +++ b/arch/arm/vfp/entry.S @@ -22,11 +22,10 @@ @ r9 = normal "successful" return address @ r10 = this threads thread_info structure @ lr = unrecognised instruction return address -@ IRQs disabled. +@ IRQs enabled. @ ENTRY(do_vfp) inc_preempt_count r10, r4 - enable_irq ldr r4, .LCvfp ldr r11, [r10, #TI_CPU] @ CPU number add r10, r10, #TI_VFPSTATE @ r10 = workspace |