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linux/arch/x86/kernel
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Jann Horn 342db04ae7 x86/dumpstack: Don't dump kernel memory based on usermode RIP 
show_opcodes() is used both for dumping kernel instructions and for dumping
user instructions. If userspace causes #PF by jumping to a kernel address,
show_opcodes() can be reached with regs->ip controlled by the user,
pointing to kernel code. Make sure that userspace can't trick us into
dumping kernel memory into dmesg.

Fixes: 7cccf0725cf7 ("x86/dumpstack: Add a show_ip() function")
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: security@kernel.org
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20180828154901.112726-1-jannh@google.com
2018-08-31 17:08:22 +02:00
..
acpi
x86/ACPI/cstate: Make APCI C1 FFH MWAIT C-state description vendor-neutral
2018-08-15 00:19:38 +02:00
apic
x86/smp: fix non-SMP broken build due to redefinition of apic_id_is_primary_thread
2018-08-14 15:00:00 -07:00
cpu
x86/speculation/l1tf: Increase l1tf memory limit for Nehalem+
2018-08-27 10:29:14 +02:00
fpu
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
kprobes
kprobes/x86: Fix %p uses in error messages
2018-06-21 17:33:42 +02:00
.gitignore
…
alternative.c
x86/alternatives: Lockdep-enforce text_mutex in text_poke*()
2018-08-30 13:02:30 +02:00
amd_gart_64.c
x86/dma/amd_gart: Use dma_direct_{alloc,free}()
2018-03-20 10:01:57 +01:00
amd_nb.c
x86/amd_nb: Add support for Raven Ridge CPUs
2018-05-13 09:00:27 -07:00
apb_timer.c
…
aperture_64.c
x86/gart: Exclude GART aperture from vmcore
2018-01-11 15:09:24 +01:00
apm_32.c
x86/apm: Don't access __preempt_count with zeroed fs
2018-07-16 17:59:57 +02:00
asm-offsets_32.c
x86/entry/32: Load task stack from x86_tss.sp1 in SYSENTER handler
2018-07-20 01:11:36 +02:00
asm-offsets_64.c
x86/asm-offsets: Move TSS_sp0 and TSS_sp1 to asm-offsets.c
2018-07-20 01:11:35 +02:00
asm-offsets.c
x86/entry/32: Enter the kernel via trampoline stack
2018-07-20 01:11:37 +02:00
audit_64.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
bootflag.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
check.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cpuid.c
x86/cpuid: Allow cpuid_read() to schedule
2018-03-27 12:01:48 +02:00
crash_dump_32.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
crash_dump_64.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
crash.c
kexec_file, x86: move re-factored code to generic side
2018-04-13 17:10:27 -07:00
devicetree.c
Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-04-02 16:15:32 -07:00
doublefault.c
x86/entry: Fix assumptions that the HW TSS is at the beginning of cpu_tss
2017-12-17 13:59:55 +01:00
dumpstack_32.c
x86/dumpstack: Unify show_regs()
2018-03-08 12:04:59 +01:00
dumpstack_64.c
x86/dumpstack: Unify show_regs()
2018-03-08 12:04:59 +01:00
dumpstack.c
x86/dumpstack: Don't dump kernel memory based on usermode RIP
2018-08-31 17:08:22 +02:00
e820.c
x86/e820: put !E820_TYPE_RAM regions into memblock.reserved
2018-06-28 11:16:44 -07:00
early_printk.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
early-quirks.c
On GEM side:
2018-07-20 12:29:24 +10:00
ebda.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
eisa.c
x86/eisa: Add missing include
2017-08-31 21:34:48 +02:00
espfix_64.c
x86/espfix: Document use of _PAGE_GLOBAL
2018-04-09 18:27:33 +02:00
ftrace_32.S
x86/retpoline/ftrace: Convert ftrace assembler indirect jumps
2018-01-12 00:14:30 +01:00
ftrace_64.S
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-01-28 12:19:23 -08:00
ftrace.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
head32.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
head64.c
Revert "x86/mm: Mark __pgtable_l5_enabled __initdata"
2018-06-23 14:20:37 +02:00
head_32.S
x86/pgtable/32: Allocate 8k page-tables when PTI is enabled
2018-07-20 01:11:41 +02:00
head_64.S
x86/asm/64: Use 32-bit XOR to zero registers
2018-07-03 09:59:29 +02:00
hpet.c
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
hw_breakpoint.c
perf/arch/x86: Implement hw_breakpoint_arch_parse()
2018-06-26 09:07:55 +02:00
i8237.c
x86/i8237: Register device based on FADT legacy boot flag
2018-04-27 16:44:29 +02:00
i8253.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
i8259.c
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
idt.c
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
io_delay.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ioport.c
x86/ioport: add ksys_ioperm() helper; remove in-kernel calls to sys_ioperm()
2018-04-02 20:16:12 +02:00
irq_32.c
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
irq_64.c
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
irq_work.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
irq.c
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
irqflags.S
x86/paravirt: Make native_save_fl() extern inline
2018-07-03 10:56:27 +02:00
irqinit.c
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
itmt.c
x86/headers: Remove duplicate #includes
2017-12-12 11:32:24 +01:00
jailhouse.c
x86: Convert x86_platform_ops to timespec64
2018-05-19 14:03:14 +02:00
jump_label.c
x86/alternatives, jumplabel: Use text_poke_early() before mm_init()
2018-07-20 00:02:38 +02:00
kdebugfs.c
x86, mpparse, x86/acpi, x86/PCI, x86/dmi, SFI: Use memremap() for RAM mappings
2017-07-18 11:37:58 +02:00
kexec-bzimage64.c
Fix kexec forbidding kernels signed with keys in the secondary keyring to boot
2018-08-16 09:57:20 -07:00
kgdb.c
…
ksysfs.c
treewide: kmalloc() -> kmalloc_array()
2018-06-12 16:19:22 -07:00
kvm.c
x86/mm: Only use tlb_remove_table() for paravirt
2018-08-23 11:56:31 -07:00
kvmclock.c
Merge branch 'l1tf-final' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-08-14 09:46:06 -07:00
ldt.c
x86/ldt: Enable LDT user-mapping for PAE
2018-07-20 01:11:48 +02:00
livepatch.c
…
machine_kexec_32.c
x86/kexec: Allocate 8k PGDs for PTI
2018-07-30 13:53:48 +02:00
machine_kexec_64.c
x86/mm: Stop pretending pgtable_l5_enabled is a variable
2018-05-19 11:56:57 +02:00
Makefile
x86/paravirt: Make native_save_fl() extern inline
2018-07-03 10:56:27 +02:00
mmconf-fam10h_64.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
module.c
x86: Treat R_X86_64_PLT32 as R_X86_64_PC32
2018-02-22 09:01:10 -08:00
mpparse.c
Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-02-14 17:02:15 -08:00
msr.c
…
nmi_selftest.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
nmi.c
locking/atomics: COCCINELLE/treewide: Convert trivial ACCESS_ONCE() patterns to READ_ONCE()/WRITE_ONCE()
2017-10-25 11:01:08 +02:00
paravirt_patch_32.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
paravirt_patch_64.c
x86/asm/64: Use 32-bit XOR to zero registers
2018-07-03 09:59:29 +02:00
paravirt-spinlocks.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
paravirt.c
x86/mm: Only use tlb_remove_table() for paravirt
2018-08-23 11:56:31 -07:00
pci-calgary_64.c
x86/dma: Remove dma_alloc_coherent_gfp_flags()
2018-03-20 10:01:58 +01:00
pci-dma.c
IOMMU Update for Linux v4.19
2018-08-24 13:10:38 -07:00
pci-iommu_table.c
x86/iommu: Use NULL instead of 0
2018-08-02 14:33:19 +02:00
pci-swiotlb.c
x86/dma: Use generic swiotlb_ops
2018-03-20 10:01:57 +01:00
pcspeaker.c
x86/platform/pcspeaker: Use PTR_ERR_OR_ZERO() to fix ptr_ret.cocci warning
2018-07-24 09:46:42 +02:00
perf_regs.c
perf/x86: Store user space frame-pointer value on a sample
2018-05-25 08:11:12 +02:00
platform-quirks.c
x86/i8237: Register device based on FADT legacy boot flag
2018-04-27 16:44:29 +02:00
pmem.c
resource: Provide resource struct in resource walk callback
2017-11-07 15:35:57 +01:00
probe_roms.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
process_32.c
x86/entry: Rename update_sp0 to update_task_stack
2018-07-20 01:11:40 +02:00
process_64.c
x86/process: Re-export start_thread()
2018-08-20 18:04:42 +02:00
process.c
x86/entry/32: Enter the kernel via trampoline stack
2018-07-20 01:11:37 +02:00
ptrace.c
signal: Ensure every siginfo we send has all bits initialized
2018-04-25 10:40:51 -05:00
pvclock.c
x86: Convert x86_platform_ops to timespec64
2018-05-19 14:03:14 +02:00
quirks.c
x86/mce: Check for alternate indication of machine check recovery on Skylake
2018-06-07 22:22:12 +02:00
reboot_fixups_32.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
reboot.c
x86/apic: Fix restoring boot IRQ mode in reboot and kexec/kdump
2018-02-17 11:47:45 +01:00
relocate_kernel_32.S
…
relocate_kernel_64.S
x86/kexec: Make kexec (mostly) work in 5-level paging mode
2018-01-31 08:39:40 +01:00
resource.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
rtc.c
x86: Convert x86_platform_ops to timespec64
2018-05-19 14:03:14 +02:00
setup_percpu.c
x86/cpu_entry_area: Sync cpu_entry_area to initial_page_table
2018-03-01 09:48:27 +01:00
setup.c
pci-v4.19-changes
2018-08-16 09:21:54 -07:00
signal_compat.c
signal: Add TRAP_UNK si_code for undiagnosted trap exceptions
2018-04-25 10:40:56 -05:00
signal.c
rseq: Avoid infinite recursion when delivering SIGSEGV
2018-06-22 19:04:22 +02:00
smp.c
x86/irq: Let interrupt handlers set kvm_cpu_l1tf_flush_l1d
2018-08-05 09:53:13 +02:00
smpboot.c
Merge 4.18-rc7 into master to pick up the KVM dependcy
2018-08-05 16:39:29 +02:00
stacktrace.c
x86/stacktrace: Do not fail for ORC with regs on stack
2018-06-21 16:34:56 +02:00
step.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
sys_x86_64.c
compat: Move compat_timespec/ timeval to compat_time.h
2018-04-19 13:29:54 +02:00
sysfb_efi.c
…
sysfb_simplefb.c
…
sysfb.c
…
tboot.c
x86/pti: Make unpoison of pgd for trusted boot work for real
2018-01-11 23:36:59 +01:00
tce_64.c
…
time.c
x86: Don't include linux/irq.h from asm/hardirq.h
2018-08-05 09:53:13 +02:00
tls.c
x86/ldt: Make the LDT mapping RO
2017-12-23 21:13:01 +01:00
tls.h
…
topology.c
…
trace_clock.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
tracepoint.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
traps.c
Merge branch 'linus' into x86/urgent
2018-06-22 21:20:35 +02:00
tsc_msr.c
x86/platform/intel-mid: Remove custom TSC calibration
2018-07-03 13:08:21 +02:00
tsc_sync.c
Merge branch 'x86-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-11-13 19:07:38 -08:00
tsc.c
x86/tsc: Consolidate init code
2018-07-30 19:33:35 +02:00
umip.c
signal: Ensure every siginfo we send has all bits initialized
2018-04-25 10:40:51 -05:00
unwind_frame.c
x86/unwind: Disable unwinder warnings on 32-bit
2017-10-10 12:49:49 +02:00
unwind_guess.c
x86/unwind: Add the ORC unwinder
2017-07-26 13:18:20 +02:00
unwind_orc.c
x86/unwind/orc: Detect the end of the stack
2018-06-21 16:34:56 +02:00
uprobes.c
uprobes/x86: Remove incorrect WARN_ON() in uprobe_init_insn()
2018-06-21 17:11:02 +02:00
verify_cpu.S
x86/boot: Annotate verify_cpu() as a callable function
2017-09-28 09:39:03 +02:00
vm86_32.c
x86/entry: Rename update_sp0 to update_task_stack
2018-07-20 01:11:40 +02:00
vmlinux.lds.S
x86/mm/pti: Make pti_clone_kernel_text() compile on 32 bit
2018-07-20 01:11:44 +02:00
vsmp_64.c
x86/apic: Remove unused callbacks
2017-09-25 20:51:58 +02:00
x86_init.c
x86/tsc: Make use of tsc_calibrate_cpu_early()
2018-07-20 00:02:44 +02:00