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linux/arch/arm64/kernel
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Dave Martin 27e7506c33 arm64: fpsimd: Prevent registers leaking across exec 
commit 096622104e upstream.

There are some tricky dependencies between the different stages of
flushing the FPSIMD register state during exec, and these can race
with context switch in ways that can cause the old task's regs to
leak across.  In particular, a context switch during the memset() can
cause some of the task's old FPSIMD registers to reappear.

Disabling preemption for this small window would be no big deal for
performance: preemption is already disabled for similar scenarios
like updating the FPSIMD registers in sigreturn.

So, instead of rearranging things in ways that might swap existing
subtle bugs for new ones, this patch just disables preemption
around the FPSIMD state flushing so that races of this type can't
occur here.  This brings fpsimd_flush_thread() into line with other
code paths.

Fixes: 674c242c93 ("arm64: flush FP/SIMD state correctly after execve()")
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2017-09-02 07:07:54 +02:00
..
probes arm64: migrate exception table users off module.h and onto extable.h 2016-09-20 09:36:21 +01:00
vdso arm64/vdso: Fix nsec handling for CLOCK_MONOTONIC_RAW 2017-06-29 13:00:30 +02:00
.gitignore arm64: Build infrastructure 2012-09-17 13:42:21 +01:00
acpi.c ARM64: ACPI: enable ACPI_SPCR_TABLE 2016-09-28 17:46:57 +02:00
acpi_numa.c arm64/numa: avoid inconsistent information to be printed 2016-09-09 14:59:08 +01:00
acpi_parking_protocol.c arm64: kernel: acpi: fix ioremap in ACPI parking protocol cpu_postboot 2016-02-26 15:39:52 +00:00
alternative.c arm64: alternative: Add support for patching adrp instructions 2016-09-09 15:03:28 +01:00
arm64ksyms.c arm: kernel: Add SMC structure parameter 2017-04-12 12:41:21 +02:00
armv8_deprecated.c arm64: armv8_deprecated: ensure extension of addr 2017-05-25 15:44:45 +02:00
asm-offsets.c arm: kernel: Add SMC structure parameter 2017-04-12 12:41:21 +02:00
cacheinfo.c arm64: simplify sysreg manipulation 2016-09-09 11:43:50 +01:00
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
cpu_errata.c arm64: cpufeature: Schedule enable() calls instead of calling them via IPI 2016-10-20 09:50:53 +01:00
cpu_ops.c arm64: apply __ro_after_init to some objects 2016-08-22 12:32:29 +01:00
cpufeature.c arm64: fix erroneous __raw_read_system_reg() cases 2017-03-12 06:41:48 +01:00
cpuidle.c arm64: add support for ACPI Low Power Idle(LPI) 2016-07-21 23:29:38 +02:00
cpuinfo.c arm64: Rearrange CPU errata workaround checks 2016-09-09 15:03:28 +01:00
debug-monitors.c arm64: simplify sysreg manipulation 2016-09-09 11:43:50 +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
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 ftrace: Remove CONFIG_HAVE_FUNCTION_GRAPH_FP_TEST from config 2016-08-24 12:15:13 +02:00
entry.S arm64: entry: improve data abort handling of tagged pointers 2017-06-14 15:06:05 +02:00
entry32.S arm64: entry32: remove pointless register assignment 2015-07-10 16:47:13 +01:00
fpsimd.c arm64: fpsimd: Prevent registers leaking across exec 2017-09-02 07:07:54 +02:00
ftrace.c ftrace: Add return address pointer to ftrace_ret_stack 2016-08-24 12:15:14 +02:00
head.S arm64: kernel: Init MDCR_EL2 even in the absence of a PMU 2016-10-17 15:54:30 +01:00
hibernate-asm.S arm64: Introduce raw_{d,i}cache_line_size 2016-09-09 15:03:29 +01:00
hibernate.c Revert "arm64: hibernate: Refuse to hibernate if the boot cpu is offline" 2016-08-26 11:21:25 +01:00
hw_breakpoint.c arm64: hw_breakpoint: fix watchpoint matching for tagged pointers 2017-06-14 15:06:05 +02:00
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: insn: Add helpers for adrp offsets 2016-09-09 15:03:28 +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: kaslr: Fix up the kernel image alignment 2017-03-30 09:41:26 +02:00
kgdb.c arm64: kgdb: handle read-only text / modules 2016-09-23 11:25:01 +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: Set UTS_MACHINE in the Makefile 2016-08-31 12:31:38 +01:00
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 arm64: PCI: Add local struct device pointers 2017-04-12 12:41:17 +02:00
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 KVM: arm64: Fix the issues when guest PMCCFILTR is configured 2016-11-18 09:06:58 +00:00
perf_regs.c perf: Move task_pt_regs sampling into arch code 2015-01-09 11:12:28 +01:00
process.c arm64: fix show_regs fallout from KERN_CONT changes 2016-10-20 15:27:56 +01:00
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 arm64/ptrace: Reject attempts to set incomplete hardware breakpoint fields 2017-01-26 08:24:41 +01:00
relocate_kernel.S arm64: Introduce raw_{d,i}cache_line_size 2016-09-09 15:03:29 +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 arm64: Set UTS_MACHINE in the Makefile 2016-08-31 12:31:38 +01:00
signal.c arm64: factor work_pending state machine to C 2016-08-22 10:00:48 +01:00
signal32.c arm64: Fix misspellings in comments. 2016-03-04 18:19:17 +00:00
sleep.S kprobes: Unpoison stack in jprobe_return() for KASAN 2016-10-16 11:02:31 +02:00
smccc-call.S firmware: qcom: scm: Fix interrupted SCM calls 2017-04-12 12:41:21 +02:00
smp.c arm64: fix NULL dereference in have_cpu_die() 2017-07-05 14:40:31 +02:00
smp_spin_table.c arm64: vmlinux.ld: Add mmuoff data sections and move mmuoff text into idmap 2016-08-25 18:00:30 +01:00
stacktrace.c arm64: fix dump_backtrace/unwind_frame with NULL tsk 2016-09-26 14:24:01 +01:00
suspend.c arm64: suspend: Reconfigure PSTATE after resume from idle 2016-10-20 09:50:54 +01:00
sys.c arm64: compat: Check for AArch32 state 2016-04-20 12:22:42 +01:00
sys32.c arm64: fix implementation of mmap2 compat syscall 2015-03-19 10:43:51 +00:00
sys_compat.c arm64: simplify sysreg manipulation 2016-09-09 11:43:50 +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: traps: fix userspace cache maintenance emulation on a tagged pointer 2017-06-14 15:06:04 +02:00
vdso.c arm64/vdso: Fix nsec handling for CLOCK_MONOTONIC_RAW 2017-06-29 13:00:30 +02:00
vmlinux.lds.S nmi_backtrace: generate one-line reports for idle cpus 2016-10-07 18:46:30 -07:00