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Andy Lutomirski 956421fbb7 x86/asm/entry/64: Remove a bogus 'ret_from_fork' optimization 
'ret_from_fork' checks TIF_IA32 to determine whether 'pt_regs' and
the related state make sense for 'ret_from_sys_call'.  This is
entirely the wrong check.  TS_COMPAT would make a little more
sense, but there's really no point in keeping this optimization
at all.

This fixes a return to the wrong user CS if we came from int
0x80 in a 64-bit task.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/4710be56d76ef994ddf59087aad98c000fbab9a4.1424989793.git.luto@amacapital.net
[ Backported from tip:x86/asm. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-03-05 01:12:23 +01:00
..
acpi
Merge branches 'core-urgent-for-linus' and 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2015-02-21 10:36:06 -08:00
apic
Revert "x86/apic: Only disable CPU x2apic mode when necessary"
2015-02-13 10:26:18 -08:00
cpu
x86: Init per-cpu shadow copy of CR4 on 32-bit CPUs too
2015-02-28 08:04:20 +01:00
kprobes
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2015-03-01 11:56:13 -08:00
.gitignore
…
alternative.c
kprobes, x86: Allow kprobes on text_poke/hw_breakpoint
2014-04-24 10:03:02 +02:00
amd_gart_64.c
x86: enable DMA CMA with swiotlb
2014-06-04 16:53:57 -07:00
amd_nb.c
x86, amd_nb: Add device IDs to NB tables for F15h M60h
2014-10-20 14:18:45 +02:00
apb_timer.c
x86/platform: Remove unused function from apb_timer.c
2014-12-23 10:43:35 +01:00
aperture_64.c
x86/gart: Tidy messages and add bridge device info
2014-05-23 10:47:19 -06:00
apm_32.c
cpuidle: Invert CPUIDLE_FLAG_TIME_VALID logic
2014-11-12 21:17:27 +01:00
asm-offsets_32.c
x86/asm: Guard against building the 32/64-bit versions of the asm-offsets*.c file directly
2014-12-11 11:43:56 +01:00
asm-offsets_64.c
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2014-12-14 11:51:50 -08:00
asm-offsets.c
sched, x86: Provide a per-cpu preempt_count implementation
2013-09-25 14:07:57 +02:00
audit_64.c
x86: hook up execveat system call
2014-12-13 12:42:51 -08:00
bootflag.c
…
check.c
x86/mm: memblock: switch to use NUMA_NO_NODE
2014-01-21 16:19:47 -08:00
cpuid.c
x86, cpuid: Use PTR_ERR_OR_ZERO
2014-10-17 13:40:51 -07:00
crash_dump_32.c
…
crash_dump_64.c
…
crash.c
x86, irq: Move IOAPIC related declarations from hw_irq.h into io_apic.h
2014-12-16 14:08:17 +01:00
devicetree.c
x86, irq, devicetree: Release IOAPIC pin when PCI device is disabled
2014-06-21 23:05:44 +02:00
doublefault.c
x86: Delete non-required instances of include <linux/init.h>
2014-01-06 21:25:18 -08:00
dumpstack_32.c
Merge branch 'x86-threadinfo-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2014-04-01 10:17:18 -07:00
dumpstack_64.c
x86_64, traps: Stop using IST for #SS
2014-11-23 13:56:19 -08:00
dumpstack.c
x86_64: add KASan support
2015-02-13 21:21:41 -08:00
e820.c
x86, e820: Clean up sanitize_e820_map() users
2015-01-23 16:14:27 +01:00
early_printk.c
Specify PCI based UART for earlyprintk
2015-02-02 10:11:27 -08:00
early-quirks.c
drm/i915/skl: Add the additional graphics stolen sizes
2014-09-24 14:47:39 +02:00
entry_32.S
x86/xen: allow privcmd hypercalls to be preempted
2015-02-23 16:30:24 +00:00
entry_64.S
x86/asm/entry/64: Remove a bogus 'ret_from_fork' optimization
2015-03-05 01:12:23 +01:00
espfix_64.c
x86, espfix: Remove stale ptemask
2014-11-11 17:57:46 +01:00
ftrace.c
module: remove mod arg from module_free, rename module_memfree().
2015-01-20 11:38:33 +10:30
head32.c
x86: Store a per-cpu shadow copy of CR4
2015-02-04 12:10:42 +01:00
head64.c
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2015-02-16 14:58:12 -08:00
head_32.S
x86: fix compile error due to X86_TRAP_NMI use in asm files
2014-03-07 18:58:40 -08:00
head_64.S
x86_64: add KASan support
2015-02-13 21:21:41 -08:00
head.c
x86: Make sure we can boot in the case the BDA contains pure garbage
2013-02-27 13:38:57 -08:00
hpet.c
kernel.h: remove ancient __FUNCTION__ hack
2015-02-12 18:54:13 -08:00
hw_breakpoint.c
perf/x86: Remove get_hbp_len and replace with bp_len
2014-12-03 15:14:30 +01:00
i386_ksyms_32.c
sched, x86: Optimize the preempt_schedule() call
2013-09-25 14:23:07 +02:00
i387.c
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2015-02-16 14:58:12 -08:00
i8237.c
…
i8253.c
…
i8259.c
x86/irq: Fix XT-PIC-XT-PIC in /proc/interrupts
2014-10-28 12:01:08 +01:00
io_delay.c
…
ioport.c
…
iosf_mbi.c
x86/platform/intel/iosf: Add debugfs config option for IOSF
2014-09-19 13:08:43 +02:00
irq_32.c
x86: Clean up current_stack_pointer
2015-01-02 10:22:46 -08:00
irq_64.c
x86: Replace __get_cpu_var uses
2014-08-26 13:45:49 -04:00
irq_work.c
x86: Tell irq work about self IPI support
2014-09-13 18:38:29 +02:00
irq.c
x86/irq: Check for valid irq descriptor in check_irq_vectors_for_cpu_disable()
2015-02-18 15:01:42 +01:00
irqinit.c
x86, irq: Move local APIC related code from io_apic.c into vector.c
2014-12-16 14:08:16 +01:00
jump_label.c
x86/jump_label: expect default_nop if static_key gets enabled on boot-up
2013-10-19 19:45:35 -04:00
kdebugfs.c
…
kexec-bzimage64.c
kexec-bzimage64: fix sparse warnings
2014-10-14 02:18:21 +02:00
kgdb.c
x86: Delete non-required instances of include <linux/init.h>
2014-01-06 21:25:18 -08:00
ksysfs.c
x86: ksysfs.c build fix
2014-01-03 14:37:13 +00:00
kvm.c
x86/spinlocks/paravirt: Fix memory corruption on unlock
2015-02-18 14:53:49 +01:00
kvmclock.c
x86, kvm: Clear paravirt_enabled on KVM guests for espfix32's benefit
2014-12-10 12:49:39 +01:00
ldt.c
Revert "x86-64, modify_ldt: Make support for 16-bit segments a runtime option"
2014-05-21 10:22:59 -07:00
livepatch.c
livepatch: kernel: add support for live patching
2014-12-22 15:40:49 +01:00
machine_kexec_32.c
x86, irq: Move IOAPIC related declarations from hw_irq.h into io_apic.h
2014-12-16 14:08:17 +01:00
machine_kexec_64.c
x86, irq: Move IOAPIC related declarations from hw_irq.h into io_apic.h
2014-12-16 14:08:17 +01:00
Makefile
kasan: enable stack instrumentation
2015-02-13 21:21:41 -08:00
mcount_64.S
ftrace/fgraph/x86: Have prepare_ftrace_return() take ip as first parameter
2014-12-01 14:08:58 -05:00
mmconf-fam10h_64.c
x86: delete __cpuinit usage from all x86 files
2013-07-14 19:36:56 -04:00
module.c
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2015-02-21 10:41:29 -08:00
mpparse.c
x86, apic: Remove mps_oem_check callback
2014-07-31 08:05:42 -07:00
msr.c
x86, msr: Use seek definitions instead of hard-coded values
2014-10-17 13:40:55 -07:00
nmi_selftest.c
…
nmi.c
kprobes, x86: Use NOKPROBE_SYMBOL() instead of __kprobes annotation
2014-04-24 10:26:38 +02:00
paravirt_patch_32.c
…
paravirt_patch_64.c
x86_64/entry/xen: Do not invoke espfix64 on Xen
2014-07-28 15:25:40 -07:00
paravirt-spinlocks.c
x86, ticketlock: Add slowpath logic
2013-08-09 07:54:00 -07:00
paravirt.c
kprobes, x86: Prohibit probing on native_set_debugreg()/load_idt()
2014-04-24 10:02:58 +02:00
pci-calgary_64.c
x86, calgary: Use 8M TCE table size by default
2014-04-10 19:51:32 -07:00
pci-dma.c
arch/x86/kernel/pci-dma.c: fix dma_generic_alloc_coherent() when CONFIG_DMA_CMA is enabled
2014-06-04 16:53:57 -07:00
pci-iommu_table.c
…
pci-nommu.c
x86: Delete non-required instances of include <linux/init.h>
2014-01-06 21:25:18 -08:00
pci-swiotlb.c
x86: enable DMA CMA with swiotlb
2014-06-04 16:53:57 -07:00
pcspeaker.c
…
perf_regs.c
perf/x86_64: Improve user regs sampling
2015-01-09 11:12:29 +01:00
pmc_atom.c
x86: pmc_atom: Expose contents of PSS
2015-01-20 12:50:14 +01:00
probe_roms.c
…
process_32.c
x86: Store a per-cpu shadow copy of CR4
2015-02-04 12:10:42 +01:00
process_64.c
x86: Store a per-cpu shadow copy of CR4
2015-02-04 12:10:42 +01:00
process.c
x86: Clean up cr4 manipulation
2015-02-04 12:10:41 +01:00
ptrace.c
x86, syscall: Fix _TIF_NOHZ handling in syscall_trace_enter_phase1
2014-11-20 23:01:53 +01:00
pvclock.c
hung_task: add method to reset detector
2013-11-06 09:49:02 +02:00
quirks.c
x86: HPET force enable for e6xx based systems
2014-09-15 17:53:35 -07:00
reboot_fixups_32.c
…
reboot.c
x86, irq: Move IOAPIC related declarations from hw_irq.h into io_apic.h
2014-12-16 14:08:17 +01:00
relocate_kernel_32.S
x86, asm, cleanup: Replace open-coded control register values with symbolic
2013-06-25 16:26:06 -07:00
relocate_kernel_64.S
x86, reloc: Use xorl instead of xorq in relocate_kernel_64.S
2013-06-20 21:30:04 -07:00
resource.c
x86: don't exclude low BIOS area when allocating address space for non-PCI cards
2014-07-16 12:29:36 -06:00
rtc.c
kernel.h: remove ancient __FUNCTION__ hack
2015-02-12 18:54:13 -08:00
setup_percpu.c
x86: Convert a few more per-CPU items to read-mostly ones
2014-11-04 20:13:28 +01:00
setup.c
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2015-02-21 10:41:29 -08:00
signal.c
all arches, signal: move restart_block to struct task_struct
2015-02-12 18:54:12 -08:00
smp.c
asmlinkage, x86: Add explicit __visible to arch/x86/*
2014-05-05 16:07:44 -07:00
smpboot.c
x86: Consolidate boot cpu timer setup
2015-01-22 15:10:56 +01:00
stacktrace.c
…
step.c
…
sys_x86_64.c
x86 get_unmapped_area: Access mmap_legacy_base through mm_struct member
2013-08-22 10:19:35 -07:00
syscall_32.c
x86, asmlinkage: Make syscall tables visible
2013-08-06 14:20:18 -07:00
syscall_64.c
x86, asmlinkage: Make syscall tables visible
2013-08-06 14:20:18 -07:00
sysfb_efi.c
x86: sysfb: move EFI quirks from efifb to sysfb
2013-08-02 16:17:47 -07:00
sysfb_simplefb.c
x86/simplefb: Use PTR_ERR_OR_ZERO
2014-10-17 13:40:52 -07:00
sysfb.c
x86/sysfb: Use PTR_ERR_OR_ZERO
2014-10-17 13:40:52 -07:00
tboot.c
x86 / tboot / ACPI: Fail extended mode reduced hardware sleep
2013-07-31 14:25:51 +02:00
tce_64.c
…
test_nx.c
…
test_rodata.c
…
time.c
x86_64/vdso: Remove jiffies from the vvar page
2014-10-28 11:22:13 +01:00
tls.c
x86, tls: Interpret an all-zero struct user_desc as "no segment"
2015-01-22 21:45:07 +01:00
tls.h
…
topology.c
hotplug, powerpc, x86: Remove cpu_hotplug_driver_lock()
2013-09-30 19:55:51 +02:00
trace_clock.c
…
tracepoint.c
x86: Make sure IDT is page aligned
2013-07-16 15:14:48 -07:00
traps.c
Merge branch 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2015-02-09 18:01:52 -08:00
tsc_msr.c
x86: tsc: Add missing Baytrail frequency to the table
2014-02-19 17:12:24 +01:00
tsc_sync.c
x86: Delete non-required instances of include <linux/init.h>
2014-01-06 21:25:18 -08:00
tsc.c
x86/tsc: Change Fast TSC calibration failed from error to info
2015-01-23 10:53:52 +01:00
uprobes.c
uprobes/x86: Fix 2-byte opcode table
2015-02-18 20:55:53 +01:00
verify_cpu.S
…
vm86_32.c
x86, vm86: fix VM86 syscalls: use SYSCALL_DEFINEx(...)
2013-05-02 20:36:32 -04:00
vmlinux.lds.S
x86-64: Use RIP-relative addressing for most per-CPU accesses
2014-11-04 20:43:14 +01:00
vsmp_64.c
x86/apic/vsmp: Make is_vsmp_box() static
2014-08-01 15:09:45 -07:00
vsyscall_64.c
x86_64/vsyscall: Restore orig_ax after vsyscall seccomp
2014-11-10 10:46:35 +01:00
vsyscall_emu_64.S
…
vsyscall_gtod.c
timekeeping: Create struct tk_read_base and use it in struct timekeeper
2014-07-23 15:01:53 -07:00
vsyscall_trace.h
…
x86_init.c
Revert "PCI: Add x86_msi.msi_mask_irq() and msix_mask_irq()"
2014-11-11 15:14:30 -07:00
x8664_ksyms_64.c
x86_64: kasan: add interceptors for memset/memmove/memcpy functions
2015-02-13 21:21:41 -08:00
xsave.c
x86: Clean up cr4 manipulation
2015-02-04 12:10:41 +01:00