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Will Deacon d49527ed48 arm64: fault: Route pte translation faults via do_translation_fault ... commit 760bfb47c3 upstream. We currently route pte translation faults via do_page_fault, which elides the address check against TASK_SIZE before invoking the mm fault handling code. However, this can cause issues with the path walking code in conjunction with our word-at-a-time implementation because load_unaligned_zeropad can end up faulting in kernel space if it reads across a page boundary and runs into a page fault (e.g. by attempting to read from a guard region). In the case of such a fault, load_unaligned_zeropad has registered a fixup to shift the valid data and pad with zeroes, however the abort is reported as a level 3 translation fault and we dispatch it straight to do_page_fault, despite it being a kernel address. This results in calling a sleeping function from atomic context: BUG: sleeping function called from invalid context at arch/arm64/mm/fault.c:313 in_atomic(): 0, irqs_disabled(): 0, pid: 10290 Internal error: Oops - BUG: 0 [#1] PREEMPT SMP [...] [<ffffff8e016cd0cc>] ___might_sleep+0x134/0x144 [<ffffff8e016cd158>] __might_sleep+0x7c/0x8c [<ffffff8e016977f0>] do_page_fault+0x140/0x330 [<ffffff8e01681328>] do_mem_abort+0x54/0xb0 Exception stack(0xfffffffb20247a70 to 0xfffffffb20247ba0) [...] [<ffffff8e016844fc>] el1_da+0x18/0x78 [<ffffff8e017f399c>] path_parentat+0x44/0x88 [<ffffff8e017f4c9c>] filename_parentat+0x5c/0xd8 [<ffffff8e017f5044>] filename_create+0x4c/0x128 [<ffffff8e017f59e4>] SyS_mkdirat+0x50/0xc8 [<ffffff8e01684e30>] el0_svc_naked+0x24/0x28 Code: 36380080 d5384100 f9400800 9402566d (d4210000) ---[ end trace 2d01889f2bca9b9f ]--- Fix this by dispatching all translation faults to do_translation_faults, which avoids invoking the page fault logic for faults on kernel addresses. Reported-by: Ankit Jain <ankijain@codeaurora.org> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		6 years ago
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boot	ARM64: dts: marvell: armada-37xx: Fix GIC maintenance interrupt	6 years ago
configs	ZTE arm64 defconfig updates for 4.9:	7 years ago
crypto	crypto: arm64/aes-blk - honour iv_out requirement in CBC and CTR modes	6 years ago
include	mm: revert x86_64 and arm64 ELF_ET_DYN_BASE base changes	6 years ago
kernel	arm64: Make sure SPsel is always set	6 years ago
kvm	arm64: KVM: Allow unaligned accesses at EL2	6 years ago
lib	Merge branch 'work.uaccess' into for-linus	7 years ago
mm	arm64: fault: Route pte translation faults via do_translation_fault	6 years ago
net	bpf, arm64: fix faulty emission of map access in tail calls	6 years ago
xen	arm/xen: add support for vm_assist hypercall	7 years ago
Kconfig	irqchip/gicv3-its: Add workaround for QDF2400 ITS erratum 0065	6 years ago
Kconfig.debug	arm64: always enable DEBUG_RODATA and remove the Kconfig option	7 years ago
Kconfig.platforms	arm64: uniphier: select ARCH_HAS_RESET_CONTROLLER	7 years ago
Makefile	arm64: kernel: force ET_DYN ELF type for CONFIG_RELOCATABLE=y	7 years ago