Lorenzo Pieralisi f43c27188a arm64: kernel: fix __cpu_suspend mm switch on warm-boot ... On arm64 the TTBR0_EL1 register is set to either the reserved TTBR0 page tables on boot or to the active_mm mappings belonging to user space processes, it must never be set to swapper_pg_dir page tables mappings. When a CPU is booted its active_mm is set to init_mm even though its TTBR0_EL1 points at the reserved TTBR0 page mappings. This implies that when __cpu_suspend is triggered the active_mm can point at init_mm even if the current TTBR0_EL1 register contains the reserved TTBR0_EL1 mappings. Therefore, the mm save and restore executed in __cpu_suspend might turn out to be erroneous in that, if the current->active_mm corresponds to init_mm, on resume from low power it ends up restoring in the TTBR0_EL1 the init_mm mappings that are global and can cause speculation of TLB entries which end up being propagated to user space. This patch fixes the issue by checking the active_mm pointer before restoring the TTBR0 mappings. If the current active_mm == &init_mm, the code sets the TTBR0_EL1 to the reserved TTBR0 mapping instead of switching back to the active_mm, which is the expected behaviour corresponding to the TTBR0_EL1 settings when __cpu_suspend was entered. Fixes: 95322526ef ("arm64: kernel: cpu_{suspend/resume} implementation") Cc: <stable@vger.kernel.org> # 3.14+: 18ab7db Cc: <stable@vger.kernel.org> # 3.14+: 714f599 Cc: <stable@vger.kernel.org> # 3.14+: c3684fb Cc: <stable@vger.kernel.org> # 3.14+ Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>		2014-12-23 16:38:50 +00:00
..
vdso
.gitignore
alternative.c	arm64: add module support for alternatives fixups	2014-12-04 10:28:24 +00:00
arm64ksyms.c
armv8_deprecated.c	arm64: fix return code check when changing emulation handler	2014-11-25 10:05:35 +00:00
asm-offsets.c
cpu_errata.c	arm64: alternatives: fix pr_fmt string for consistency	2014-11-25 18:27:01 +00:00
cpu_ops.c
cpuidle.c
cpuinfo.c	arm64: sanity checks: add ID_AA64DFR{0,1}_EL1	2014-11-25 15:56:44 +00:00
cputable.c
debug-monitors.c
efi-entry.S	arm64 updates for 3.19	2014-12-09 13:12:47 -08:00
efi-stub.c
efi.c
entry-fpsimd.S
entry-ftrace.S	arm64: ftrace: eliminate literal pool entries	2014-11-07 15:04:49 +00:00
entry.S	arm64: ptrace: allow tracer to skip a system call	2014-11-28 10:24:13 +00:00
fpsimd.c
ftrace.c
head.S	arm64: Move some head.text functions to executable section	2014-11-26 17:19:47 +00:00
hw_breakpoint.c
hyp-stub.S
image.h
insn.c	arm64 updates for 3.19	2014-12-09 13:12:47 -08:00
io.c
irq.c	arm64: Treat handle_arch_irq as a function pointer	2014-11-25 15:56:44 +00:00
jump_label.c	arm64: jump labels: NOP out NOP -> NOP replacement	2014-11-26 17:19:47 +00:00
kgdb.c
kuser32.S
Makefile	arm64: detect silicon revisions and set cap bits accordingly	2014-11-25 13:46:37 +00:00
module.c	arm64: add module support for alternatives fixups	2014-12-04 10:28:24 +00:00
pci.c
perf_event.c	arm64: perf: Prevent wraparound during overflow	2014-12-04 10:26:54 +00:00
perf_regs.c
process.c
psci.c	arm64 fixes:	2014-12-16 14:12:33 -08:00
ptrace.c	arm64: add seccomp support	2014-11-28 10:24:59 +00:00
return_address.c
setup.c	arm64: Provide a namespace to NCAPS	2014-12-04 09:57:41 +00:00
signal32.c	arm64: add SIGSYS siginfo for compat task	2014-11-28 10:24:59 +00:00
signal.c
sleep.S	arm64: Move cpu_resume into the text section	2014-11-25 15:56:44 +00:00
smp_spin_table.c
smp.c	arm64: add module support for alternatives fixups	2014-12-04 10:28:24 +00:00
stacktrace.c
suspend.c	arm64: kernel: fix __cpu_suspend mm switch on warm-boot	2014-12-23 16:38:50 +00:00
sys32.S
sys_compat.c	arm64: compat: align cacheflush syscall with arch/arm	2014-12-01 13:31:12 +00:00
sys.c
time.c
topology.c	arm64: topology: Fix handling of multi-level cluster MPIDR-based detection	2014-11-25 15:56:43 +00:00
trace-events-emulation.h	arm64: Trace emulation of AArch32 legacy instructions	2014-11-20 16:35:02 +00:00
traps.c	arm64: Add support for hooks to handle undefined instructions	2014-11-20 16:33:43 +00:00
vdso.c
vmlinux.lds.S	arm64: vmlinux.lds.S: don't discard .exit.* sections at link-time	2014-11-25 15:56:45 +00:00