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linux/arch/arm64/kernel
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Will Deacon a454483137 arm64: fpsimd: Fix copying of FP state from signal frame into task struct 
Commit 9de52a755cfb6da5 ("arm64: fpsimd: Fix failure to restore FPSIMD
state after signals") fixed an issue reported in our FPSIMD signal
restore code but inadvertently introduced another issue which tends to
manifest as random SEGVs in userspace.

The problem is that when we copy the struct fpsimd_state from the kernel
stack (populated from the signal frame) into the struct held in the
current thread_struct, we blindly copy uninitialised stack into the
"cpu" field, which means that context-switching of the FP registers is
no longer reliable.

This patch fixes the problem by copying only the user_fpsimd member of
struct fpsimd_state. We should really rework the function prototypes
to take struct user_fpsimd_state * instead, but let's just get this
fixed for now.

Cc: Dave Martin <Dave.Martin@arm.com>
Fixes: 9de52a755cfb6da5 ("arm64: fpsimd: Fix failure to restore FPSIMD state after signals")
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-12-15 16:12:35 +00:00
..
probes
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
vdso
arm64 updates for 4.15
2017-11-15 10:56:56 -08:00
.gitignore
…
acpi_numa.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
acpi_parking_protocol.c
arm64: fix endianness annotation in acpi_parking_protocol.c
2017-06-29 11:33:15 +01:00
acpi.c
ACPI / boot: Correct address space of __acpi_map_table()
2017-07-24 22:47:56 +02:00
alternative.c
arm64: fix endianness annotation for __apply_alternatives()/get_alt_insn()
2017-06-29 16:32:43 +01:00
arm64ksyms.c
arm64: switch to RAW_COPY_USER
2017-03-28 18:23:24 -04:00
armv8_deprecated.c
arm64 updates for 4.15
2017-11-15 10:56:56 -08:00
asm-offsets.c
arm64: unwind: reference pt_regs via embedded stack frame
2017-08-09 14:07:13 +01:00
cacheinfo.c
arm64: cacheinfo: Remove CCSIDR-based cache information probing
2017-03-20 16:16:54 +00:00
cpu_errata.c
arm64: Add workaround for Cavium Thunder erratum 30115
2017-06-15 09:45:04 +01:00
cpu_ops.c
arm64: cpu_ops: Add missing 'const' qualifiers
2017-12-01 13:05:08 +00:00
cpu-reset.h
arm64: Use __pa_symbol for kernel symbols
2017-01-12 15:05:39 +00:00
cpu-reset.S
arm64: Add software workaround for Falkor erratum 1041
2017-12-12 11:45:19 +00:00
cpufeature.c
arm64/sve: Report SVE to userspace via CPUID only if supported
2017-12-14 15:14:30 +00:00
cpuidle.c
arm64: kernel: Update kerneldoc for cpu_suspend() rename
2017-03-10 18:06:24 +00:00
cpuinfo.c
arm64/sve: Detect SVE and activate runtime support
2017-11-03 15:24:21 +00:00
crash_dump.c
arm64: kdump: provide /proc/vmcore file
2017-04-05 18:31:38 +01:00
debug-monitors.c
arm64: introduce an order for exceptions
2017-11-02 15:55:41 +00:00
efi-entry.S
arm64: Add software workaround for Falkor erratum 1041
2017-12-12 11:45:19 +00:00
efi-header.S
arm64: efi: split Image code and data into separate PE/COFF sections
2017-04-04 17:50:59 +01:00
efi.c
efi/arm: Enable DMI/SMBIOS
2017-06-05 17:50:44 +02:00
entry32.S
arm64: entry32: remove pointless register assignment
2015-07-10 16:47:13 +01:00
entry-fpsimd.S
arm64/sve: Low-level SVE architectural state manipulation functions
2017-11-03 15:24:14 +00:00
entry-ftrace.S
arm64: Fix static use of function graph
2017-11-03 12:05:23 +00:00
entry.S
arm64/sve: Detect SVE and activate runtime support
2017-11-03 15:24:21 +00:00
fpsimd.c
arm64: fpsimd: Fix copying of FP state from signal frame into task struct
2017-12-15 16:12:35 +00:00
ftrace.c
arm64: ftrace: emit ftrace-mod.o contents through code
2017-12-01 13:04:59 +00:00
head.S
arm64: Add software workaround for Falkor erratum 1041
2017-12-12 11:45:19 +00:00
hibernate-asm.S
arm64: Introduce raw_{d,i}cache_line_size
2016-09-09 15:03:29 +01:00
hibernate.c
arm64: explicitly mask all exceptions
2017-11-02 15:55:40 +00:00
hw_breakpoint.c
arm64: hw_breakpoint: Use linux/uaccess.h instead of asm/uaccess.h
2017-12-12 11:53:26 +00:00
hyp-stub.S
arm64: hyp-stub: Zero x0 on successful stub handling
2017-04-09 07:49:35 -07:00
image.h
arm64 updates for 4.7:
2016-05-16 17:17:24 -07:00
insn.c
arm64 updates for 4.13:
2017-07-05 17:09:27 -07:00
io.c
arm64: Avoid aligning normal memory pointers in __memcpy_{to,from}io
2017-10-24 16:23:07 +01:00
irq.c
arm64: add basic VMAP_STACK support
2017-08-15 18:36:04 +01:00
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: Adjust the offset to avoid Image across alignment boundary
2017-08-22 18:15:42 +01:00
kgdb.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h>
2017-03-02 08:42:36 +01:00
kuser32.S
arm64: Add __NR_* definitions for compat syscalls
2014-07-10 11:02:40 +01:00
machine_kexec.c
arm64: explicitly mask all exceptions
2017-11-02 15:55:40 +00:00
Makefile
arm64: ftrace: emit ftrace-mod.o contents through code
2017-12-01 13:04:59 +00:00
module-plts.c
arm64: ftrace: emit ftrace-mod.o contents through code
2017-12-01 13:04:59 +00:00
module.c
arm64: fix endianness annotation for reloc_insn_movw() & reloc_insn_imm()
2017-06-29 11:09:39 +01:00
module.lds
arm64: ftrace: emit ftrace-mod.o contents through code
2017-12-01 13:04:59 +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
PCI: Add a generic weak pcibios_align_resource()
2017-08-02 14:53:16 -05:00
perf_callchain.c
arm64: unwind: remove sp from struct stackframe
2017-08-09 14:10:29 +01:00
perf_event.c
arm64: perf: remove unsupported events for Cortex-A73
2017-12-01 13:05:08 +00:00
perf_regs.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
process.c
arm64: fpsimd: Prevent registers leaking from dead tasks
2017-12-06 18:02:21 +00:00
psci.c
arm64: Use __pa_symbol for kernel symbols
2017-01-12 15:05:39 +00:00
ptrace.c
arm64/sve: ptrace and ELF coredump support
2017-11-03 15:24:18 +00:00
reloc_test_core.c
arm64: relocation testing module
2017-04-04 17:03:32 +01:00
reloc_test_syms.S
arm64: relocation testing module
2017-04-04 17:03:32 +01:00
relocate_kernel.S
arm64: Add software workaround for Falkor erratum 1041
2017-12-12 11:45:19 +00:00
return_address.c
arm64: unwind: remove sp from struct stackframe
2017-08-09 14:10:29 +01:00
setup.c
arm64: Move the async/fiq helpers to explicitly set process context flags
2017-11-02 15:55:41 +00:00
signal32.c
arm64/sve: Signal handling support
2017-11-03 15:24:16 +00:00
signal.c
arm64/sve: Signal handling support
2017-11-03 15:24:16 +00:00
sleep.S
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
smccc-call.S
firmware: qcom: scm: Fix interrupted SCM calls
2017-02-03 18:46:33 +00:00
smp_spin_table.c
arm64: Use __pa_symbol for kernel symbols
2017-01-12 15:05:39 +00:00
smp.c
arm64: Move the async/fiq helpers to explicitly set process context flags
2017-11-02 15:55:41 +00:00
stacktrace.c
arm64: stacktrace: avoid listing stacktrace functions in stacktrace
2017-09-13 18:53:16 -07:00
suspend.c
arm64 updates for 4.15
2017-11-15 10:56:56 -08:00
sys32.c
arm64: fix implementation of mmap2 compat syscall
2015-03-19 10:43:51 +00:00
sys_compat.c
sched/headers: Prepare for the reduction of <linux/sched.h>'s signal API dependency
2017-03-02 08:42:37 +01:00
sys.c
arm64: compat: Check for AArch32 state
2016-04-20 12:22:42 +01:00
time.c
arm64: unwind: remove sp from struct stackframe
2017-08-09 14:10:29 +01:00
topology.c
arm64: Convert to using %pOF instead of full_name
2017-07-20 10:28:41 +01:00
trace-events-emulation.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
traps.c
arm64 updates for 4.15
2017-11-15 10:56:56 -08:00
vdso.c
arm64/vdso: Support mremap() for vDSO
2017-08-09 12:16:28 +01:00
vmlinux.lds.S
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00