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ffd1b63a58
If a change in the MMU notifier sequence number forces user_mem_abort() to return early when attempting to handle a stage-2 fault, we return uninitialised stack to kvm_handle_guest_abort(), which could potentially result in the injection of an external abort into the guest or a spurious return to userspace. Neither or these are what we want to do. Initialise 'ret' to 0 in user_mem_abort() so that bailing due to a change in the MMU notrifier sequence number is treated as though the fault was handled. Reported-by: kernel test robot <lkp@intel.com> Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Will Deacon <will@kernel.org> Signed-off-by: Marc Zyngier <maz@kernel.org> Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com> Reviewed-by: Gavin Shan <gshan@redhat.com> Cc: Gavin Shan <gshan@redhat.com> Cc: Alexandru Elisei <alexandru.elisei@arm.com> Link: https://lore.kernel.org/r/20200930102442.16142-1-will@kernel.org |
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| .. | ||
| hyp | ||
| vgic | ||
| aarch32.c | ||
| arch_timer.c | ||
| arm.c | ||
| debug.c | ||
| fpsimd.c | ||
| guest.c | ||
| handle_exit.c | ||
| hyp.S | ||
| hypercalls.c | ||
| inject_fault.c | ||
| irq.h | ||
| Kconfig | ||
| Makefile | ||
| mmio.c | ||
| mmu.c | ||
| perf.c | ||
| pmu-emul.c | ||
| pmu.c | ||
| psci.c | ||
| pvtime.c | ||
| regmap.c | ||
| reset.c | ||
| sys_regs.c | ||
| sys_regs.h | ||
| trace_arm.h | ||
| trace_handle_exit.h | ||
| trace.h | ||
| va_layout.c | ||
| vgic-sys-reg-v3.c | ||