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Will Deacon eb35bdd7bc arm64: flush TLS registers during exec 
Nathan reports that we leak TLS information from the parent context
during an exec, as we don't clear the TLS registers when flushing the
thread state.

This patch updates the flushing code so that we:

  (1) Unconditionally zero the tpidr_el0 register (since this is fully
      context switched for native tasks and zeroed for compat tasks)

  (2) Zero the tp_value state in thread_info before clearing the
      tpidrr0_el0 register for compat tasks (since this is only writable
      by the set_tls compat syscall and therefore not fully switched).

A missing compiler barrier is also added to the compat set_tls syscall.

Cc: <stable@vger.kernel.org>
Acked-by: Nathan Lynch <Nathan_Lynch@mentor.com>
Reported-by: Nathan Lynch <Nathan_Lynch@mentor.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
 		2014-09-11 18:34:58 +01:00
..
vdso arm64: vdso: fix build error when switching from LE to BE 2014-07-30 15:06:35 +01:00
.gitignore arm64: Build infrastructure 2012-09-17 13:42:21 +01:00
Makefile Merge branch 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-08-04 17:13:50 -07:00
arm64ksyms.c arm64: Add ftrace support 2014-05-29 09:08:08 +01:00
asm-offsets.c arm64: KVM: implement lazy world switch for debug registers 2014-07-11 04:57:46 -07:00
cpu_ops.c arm64: kernel: enable PSCI cpu operations on UP systems 2014-07-18 15:23:25 +01:00
cpuinfo.c arm64: fix typo in I-cache policy detection 2014-08-18 19:47:03 +01:00
cputable.c arm64: add CPU_HOTPLUG infrastructure 2013-10-25 11:33:21 +01:00
debug-monitors.c KVM/ARM New features for 3.17 include: 2014-08-05 09:47:45 +02:00
efi-entry.S arm64: fix el2_setup check of CurrentEL 2014-07-04 16:16:52 +01:00
efi-stub.c efi: efistub: Convert into static library 2014-07-18 21:22:19 +01:00
efi.c Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-08-24 16:17:41 -07:00
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: Remove check of obsolete variable function_trace_stop 2014-07-18 13:58:10 -04:00
entry.S arm64: Add __NR_* definitions for compat syscalls 2014-07-10 11:02:40 +01:00
fpsimd.c arm64: fix bug for reloading FPSIMD state after cpu power off 2014-09-01 12:55:21 +01:00
ftrace.c arm64: ftrace: Add dynamic ftrace support 2014-05-29 09:08:33 +01:00
head.S arm64: Remove unused variable in head.S 2014-08-26 19:24:00 +01:00
hw_breakpoint.c arm64: is_compat_task is defined both in asm/compat.h and linux/compat.h 2014-05-12 16:43:29 +01:00
hyp-stub.S irqchip: gic-v3: Initial support for GICv3 2014-07-08 22:11:47 +00:00
image.h arm64: Update the Image header 2014-07-10 12:36:40 +01:00
insn.c arm64: introduce aarch64_insn_gen_{nop|branch_imm}() helper functions 2014-01-08 15:21:29 +00:00
io.c arm64: Device specific operations 2012-09-17 13:42:04 +01:00
irq.c arm64: use irq_set_affinity with force=false when migrating irqs 2014-09-03 19:24:38 +01:00
jump_label.c arm64, jump label: optimize jump label implementation 2014-01-08 15:23:53 +00:00
kgdb.c arm64: KGDB: Add step debugging support 2014-02-26 11:16:25 +00:00
kuser32.S arm64: Add __NR_* definitions for compat syscalls 2014-07-10 11:02:40 +01:00
module.c arm64: move encode_insn_immediate() from module.c to insn.c 2014-01-08 15:21:29 +00:00
perf_event.c arm64: fix !CONFIG_COMPAT build failures 2014-04-06 23:25:04 +01:00
perf_regs.c arm64: perf: don't rely on layout of pt_regs when grabbing sp or pc 2014-08-28 20:01:50 +01:00
process.c arm64: flush TLS registers during exec 2014-09-11 18:34:58 +01:00
psci.c arm64: kernel: add __init marker to PSCI init functions 2014-07-18 15:23:45 +01:00
ptrace.c arm64: ptrace: fix compat reg getter/setter return values 2014-08-28 20:01:42 +01:00
return_address.c arm64: ftrace: Add CALLER_ADDRx macros 2014-05-29 09:08:33 +01:00
setup.c Revert "arm64: cpuinfo: print info for all CPUs" 2014-09-01 15:55:22 +01:00
signal.c arm64: Use sigsp() 2014-08-06 13:03:45 +02:00
signal32.c Merge branch 'signal-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/misc 2014-08-09 09:58:12 -07:00
sleep.S arm64: kernel: cpu_{suspend/resume} implementation 2013-12-16 17:17:31 +00:00
smp.c Nicolas Pitre added generic tracepoints for tracing IPIs and updated the 2014-08-09 17:33:44 -07:00
smp_spin_table.c arm64: Remove boot thread synchronisation for spin-table release method 2014-05-09 15:47:46 +01:00
stacktrace.c arm64: Add 'notrace' attribute to unwind_frame() for ftrace 2014-05-29 09:04:31 +01:00
suspend.c arm64: kernel: add missing __init section marker to cpu_suspend_init 2014-07-18 15:23:59 +01:00
sys.c arm64: switch to generic sigaltstack 2013-02-14 09:17:29 -05:00
sys32.S arm64: compat: correct register concatenation for syscall wrappers 2013-10-25 15:59:36 +01:00
sys_compat.c arm64: flush TLS registers during exec 2014-09-11 18:34:58 +01:00
time.c arm64: kernel: initialize broadcast hrtimer based clock event device 2014-05-30 17:48:13 +01:00
topology.c arm64: topology: add MPIDR-based detection 2014-07-09 12:22:40 +01:00
traps.c arm64: mm: Implement 4 levels of translation tables 2014-07-23 15:27:40 +01:00
vdso.c arm64,ia64,ppc,s390,sh,tile,um,x86,mm: remove default gate area 2014-08-08 15:57:27 -07:00
vmlinux.lds.S arm64: Enable TEXT_OFFSET fuzzing 2014-07-10 12:36:58 +01:00