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linux/arch/arm64/kernel
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Mark Rutland dfbca61af0 arm64: hibernate: handle allocation failures 
In create_safe_exec_page(), we create a copy of the hibernate exit text,
along with some page tables to map this via TTBR0. We then install the
new tables in TTBR0.

In swsusp_arch_resume() we call create_safe_exec_page() before trying a
number of operations which may fail (e.g. copying the linear map page
tables). If these fail, we bail out of swsusp_arch_resume() and return
an error code, but leave TTBR0 as-is. Subsequently, the core hibernate
code will call free_basic_memory_bitmaps(), which will free all of the
memory allocations we made, including the page tables installed in
TTBR0.

Thus, we may have TTBR0 pointing at dangling freed memory for some
period of time. If the hibernate attempt was triggered by a user
requesting a hibernate test via the reboot syscall, we may return to
userspace with the clobbered TTBR0 value.

Avoid these issues by reorganising swsusp_arch_resume() such that we
have no failure paths after create_safe_exec_page(). We also add a check
that the zero page allocation succeeded, matching what we have for other
allocations.

Fixes: 82869ac57b ("arm64: kernel: Add support for hibernate/suspend-to-disk")
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: James Morse <james.morse@arm.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: <stable@vger.kernel.org> # 4.7+
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-08-12 19:08:33 +01:00
..
probes arm64: Remove stack duplicating code from jprobes 2016-08-11 17:38:16 +01:00
vdso arm64: Add support for CLOCK_MONOTONIC_RAW in clock_gettime() vDSO 2016-07-12 16:06:32 +01:00
.gitignore
acpi_numa.c arm64, ACPI, NUMA: NUMA support based on SRAT and SLIT 2016-05-30 14:27:09 +02:00
acpi_parking_protocol.c arm64: kernel: acpi: fix ioremap in ACPI parking protocol cpu_postboot 2016-02-26 15:39:52 +00:00
acpi.c arm64: acpi: add acpi=on cmdline option to prefer ACPI boot over DT 2016-04-26 14:37:41 +01:00
alternative.c arm64: mm: fold alternatives into .init 2015-12-10 17:36:08 +00:00
arm64ksyms.c Merge branch 'for-next/kprobes' into for-next/core 2016-07-21 18:20:41 +01:00
armv8_deprecated.c Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-07-29 13:55:30 -07:00
asm-offsets.c arm64 updates for 4.8: 2016-07-27 11:16:05 -07:00
cacheinfo.c arm64: kernel: add support for cpu cache information 2015-01-15 11:55:07 +00:00
cpu_errata.c arm64 updates for 4.8: 2016-07-27 11:16:05 -07:00
cpu_ops.c arm64: kernel: implement ACPI parking protocol 2016-02-16 15:12:32 +00:00
cpu-reset.h arm64: Add back cpu reset routines 2016-06-27 16:31:25 +01:00
cpu-reset.S arm64: Add back cpu reset routines 2016-06-27 16:31:25 +01:00
cpufeature.c - ARM: GICv3 ITS emulation and various fixes. Removal of the old 2016-08-02 16:11:27 -04:00
cpuidle.c arm64: add support for ACPI Low Power Idle(LPI) 2016-07-21 23:29:38 +02:00
cpuinfo.c arm64: cpuinfo: Expose MIDR_EL1 and REVIDR_EL1 to sysfs 2016-07-12 16:09:37 +01:00
debug-monitors.c Merge branch 'for-next/kprobes' into for-next/core 2016-07-21 18:20:41 +01:00
efi-entry.S arm64: move early boot code to the .init segment 2016-04-14 18:11:30 +01:00
efi.c arm64: efi: avoid block mappings for unaligned UEFI memory regions 2016-07-01 11:56:26 +01:00
entry32.S arm64: entry32: remove pointless register assignment 2015-07-10 16:47:13 +01:00
entry-fpsimd.S arm64: fpsimd: fix a typo in fpsimd_save_partial_state ENDPROC 2014-07-31 11:42:42 +01:00
entry-ftrace.S arm64: ftrace: fix function_graph tracer panic 2015-10-02 11:12:56 +01:00
entry.S arm64: Handle el1 synchronous instruction aborts cleanly 2016-08-12 17:58:48 +01:00
fpsimd.c arm64: Fix misspellings in comments. 2016-03-04 18:19:17 +00:00
ftrace.c arm64: ftrace: modify a stack frame in a safe way 2015-12-21 17:26:01 +00:00
head.S arm64: relocatable: suppress R_AARCH64_ABS64 relocations in vmlinux 2016-07-29 10:45:01 +01:00
hibernate-asm.S arm64: kernel: Add support for hibernate/suspend-to-disk 2016-04-28 13:36:22 +01:00
hibernate.c arm64: hibernate: handle allocation failures 2016-08-12 19:08:33 +01:00
hw_breakpoint.c arm64: Blacklist non-kprobe-able symbol 2016-07-19 15:03:20 +01:00
hyp-stub.S arm64: Add back cpu reset routines 2016-06-27 16:31:25 +01:00
image.h arm64 updates for 4.7: 2016-05-16 17:17:24 -07:00
insn.c arm64: kprobes instruction simulation support 2016-07-19 15:03:21 +01:00
io.c arm64: optimize memcpy_{from,to}io() and memset_io() 2014-11-06 17:25:27 +00:00
irq.c arm64: remove irq_count and do_softirq_own_stack() 2015-12-21 17:26:01 +00:00
jump_label.c jump_label: Rename JUMP_LABEL_{EN,DIS}ABLE to JUMP_LABEL_{JMP,NOP} 2015-08-03 11:34:12 +02:00
kaslr.c arm64: relocatable: deal with physically misaligned kernel images 2016-04-26 12:23:28 +01:00
kgdb.c arm64: Blacklist non-kprobe-able symbol 2016-07-19 15:03:20 +01:00
kuser32.S arm64: Add __NR_* definitions for compat syscalls 2014-07-10 11:02:40 +01:00
machine_kexec.c arm64/kexec: Add pr_debug output 2016-06-27 16:31:26 +01:00
Makefile arm64 updates for 4.8: 2016-07-27 11:16:05 -07:00
module-plts.c arm64: add support for module PLTs 2016-02-24 14:57:24 +00:00
module.c arm64: add support for kernel ASLR 2016-02-24 14:57:27 +00:00
module.lds arm64: add support for module PLTs 2016-02-24 14:57:24 +00:00
paravirt.c arm64: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING and pv_time_ops 2015-12-21 14:40:54 +00:00
pci.c Merge branch 'pci/resource' into next 2016-08-01 12:23:44 -05:00
perf_callchain.c perf core: Add a 'nr' field to perf_event_callchain_context 2016-05-16 23:11:51 -03:00
perf_event.c arm64: perf: don't expose CHAIN event in sysfs 2016-04-25 15:05:24 +01:00
perf_regs.c perf: Move task_pt_regs sampling into arch code 2015-01-09 11:12:28 +01:00
process.c exit_thread: remove empty bodies 2016-05-20 17:58:30 -07:00
psci.c ARM: 8511/1: ARM64: kernel: PSCI: move PSCI idle management code to drivers/firmware 2016-02-11 15:33:38 +00:00
ptrace.c Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2016-07-29 17:38:46 -07:00
relocate_kernel.S arm64/kexec: Add core kexec support 2016-06-27 16:31:25 +01:00
return_address.c arm64: ftrace: fix a stack tracer's output under function graph tracer 2015-12-21 17:26:02 +00:00
setup.c DeviceTree update for 4.8: 2016-07-30 11:32:01 -07:00
signal32.c arm64: Fix misspellings in comments. 2016-03-04 18:19:17 +00:00
signal.c arm64: Rework valid_user_regs 2016-03-02 15:49:28 +00:00
sleep.S arm64: Change cpu_resume() to enable mmu early then access sleep_sp by va 2016-04-28 12:05:46 +01:00
smccc-call.S ARM: 8480/2: arm64: add implementation for arm-smccc 2016-01-04 16:24:45 +00:00
smp_spin_table.c arm64: spin-table: add missing of_node_put() 2016-04-20 10:35:15 +01:00
smp.c arm64: Support hard limit of cpu count by nr_cpus 2016-08-09 11:00:44 +01:00
stacktrace.c arm64: make irq_stack_ptr more robust 2016-02-12 15:53:51 +00:00
suspend.c arm64: Change cpu_resume() to enable mmu early then access sleep_sp by va 2016-04-28 12:05:46 +01:00
sys32.c arm64: fix implementation of mmap2 compat syscall 2015-03-19 10:43:51 +00:00
sys_compat.c arm64: compat: align cacheflush syscall with arch/arm 2014-12-01 13:31:12 +00:00
sys.c arm64: compat: Check for AArch32 state 2016-04-20 12:22:42 +01:00
time.c arm64: ftrace: fix a stack tracer's output under function graph tracer 2015-12-21 17:26:02 +00:00
topology.c arm64: kernel: remove non-legit DT warnings when booting using ACPI 2015-07-27 11:08:41 +01:00
trace-events-emulation.h arm64: Trace emulation of AArch32 legacy instructions 2014-11-20 16:35:02 +00:00
traps.c arm64: trap userspace "dc cvau" cache operation on errata-affected core 2016-07-01 11:46:00 +01:00
vdso.c arm64: Add support for CLOCK_MONOTONIC_RAW in clock_gettime() vDSO 2016-07-12 16:06:32 +01:00
vmlinux.lds.S arm64: relocatable: suppress R_AARCH64_ABS64 relocations in vmlinux 2016-07-29 10:45:01 +01:00