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4d7f72b6e1
linux/arch/x86/kernel
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Josh Poimboeuf 4d7f72b6e1 x86/speculation: Fill RSB on vmexit for IBRS 
commit 9756bba284 upstream.

Prevent RSB underflow/poisoning attacks with RSB.  While at it, add a
bunch of comments to attempt to document the current state of tribal
knowledge about RSB attacks and what exactly is being mitigated.

Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-07-25 11:26:49 +02:00
..
acpi x86: Prepare asm files for straight-line-speculation 2022-07-25 11:26:28 +02:00
apic x86: Fix return value of __setup handlers 2022-06-09 10:21:05 +02:00
cpu x86/speculation: Fill RSB on vmexit for IBRS 2022-07-25 11:26:49 +02:00
fpu x86/fpu: Limit xstate copy size in xstateregs_set() 2021-07-20 16:05:52 +02:00
kprobes x86: Prepare inline-asm for straight-line-speculation 2022-07-25 11:26:29 +02:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
alternative.c x86,static_call: Use alternative RET encoding 2022-07-25 11:26:37 +02:00
amd_gart_64.c dma-mapping: split <linux/dma-mapping.h> 2020-10-06 07:07:03 +02:00
amd_nb.c x86/amd_nb: Add AMD family 17h model 60h PCI IDs 2020-05-22 18:24:40 +02:00
apb_timer.c x86/apb_timer: Drop unused TSC calibration 2020-05-27 13:05:59 +02:00
aperture_64.c
apm_32.c
asm-offsets_32.c x86 entry code updates: 2020-03-30 19:14:28 -07:00
asm-offsets_64.c x86/pv: Switch SWAPGS to ALTERNATIVE 2021-12-08 09:03:27 +01:00
asm-offsets.c x86: remove address space overrides using set_fs() 2020-09-08 22:21:36 -04:00
audit_64.c x86/audit: Fix a -Wmissing-prototypes warning for ia32_classify_syscall() 2020-05-19 18:03:07 +02:00
bootflag.c
cc_platform.c x86/sev: Add an x86 version of cc_platform_has() 2021-11-18 14:04:32 +01:00
check.c
cpuid.c
crash_core_32.c mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
crash_core_64.c mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
crash_dump_32.c
crash_dump_64.c
crash.c x86/crash: Fix crash_setup_memmap_entries() out-of-bounds access 2021-04-28 13:40:02 +02:00
devicetree.c x86_ioapic_Consolidate_IOAPIC_allocation 2020-09-16 16:52:32 +02:00
doublefault_32.c x86/entry: Convert double fault exception to IDTENTRY_DF 2020-06-11 15:15:03 +02:00
dumpstack_32.c x86/32: Remove CONFIG_DOUBLEFAULT 2020-04-14 14:24:05 +02:00
dumpstack_64.c x86/dumpstack/64: Add noinstr version of get_stack_info() 2020-09-09 11:33:19 +02:00
dumpstack.c x86/dumpstack: Do not try to access user space code of other tasks 2020-11-18 12:56:29 +01:00
e820.c x86/boot: Fix memremap of setup_indirect structures 2022-03-16 14:16:02 +01:00
early_printk.c mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
early-quirks.c x86/gpu: Reserve stolen memory for first integrated Intel GPU 2022-01-27 10:53:41 +01:00
ebda.c
eisa.c
espfix_64.c mm: introduce include/linux/pgtable.h 2020-06-09 09:39:13 -07:00
ftrace_32.S x86: Prepare asm files for straight-line-speculation 2022-07-25 11:26:28 +02:00
ftrace_64.S x86: Prepare asm files for straight-line-speculation 2022-07-25 11:26:28 +02:00
ftrace.c x86/ftrace: Use alternative RET encoding 2022-07-25 11:26:37 +02:00
head_32.S x86: Prepare asm files for straight-line-speculation 2022-07-25 11:26:28 +02:00
head_64.S objtool: Add entry UNRET validation 2022-07-25 11:26:45 +02:00
head32.c
head64.c x86: Clear .brk area at early boot 2022-07-21 21:20:17 +02:00
hpet.c x86/hpet: Use another crystalball to evaluate HPET usability 2021-10-13 10:04:30 +02:00
hw_breakpoint.c x86/debug: Prevent data breakpoints on cpu_dr7 2021-02-10 09:29:22 +01:00
i8237.c
i8253.c
i8259.c x86/i8259: Use printk_deferred() to prevent deadlock 2020-07-29 16:27:16 +02:00
idt.c This feature enhances the current guest memory encryption support 2020-10-14 10:21:34 -07:00
ima_arch.c ima: force signature verification when CONFIG_KEXEC_SIG is configured 2022-07-21 21:20:11 +02:00
io_delay.c
ioport.c x86/ioperm: Prevent a memory leak when fork fails 2020-05-28 21:36:20 +02:00
irq_32.c x86/irq: Rework handle_irq() for 64-bit 2020-06-11 15:15:12 +02:00
irq_64.c x86/irq: Make run_on_irqstack_cond() typesafe 2020-09-22 22:13:34 +02:00
irq_work.c x86/entry: Convert various system vectors 2020-06-11 15:15:14 +02:00
irq.c x86/irq: Ensure PI wakeup handler is unregistered before module unload 2021-11-18 14:03:41 +01:00
irqflags.S x86: Prepare asm files for straight-line-speculation 2022-07-25 11:26:28 +02:00
irqinit.c x86/headers: Remove APIC headers from <asm/smp.h> 2020-08-06 16:13:09 +02:00
itmt.c sysctl: pass kernel pointers to ->proc_handler 2020-04-27 02:07:40 -04:00
jailhouse.c locking/seqlock, headers: Untangle the spaghetti monster 2020-08-06 16:13:13 +02:00
jump_label.c x86/jump_label: Move 'inline' keyword placement 2020-03-27 11:05:41 +01:00
kdebugfs.c x86/boot: Fix memremap of setup_indirect structures 2022-03-16 14:16:02 +01:00
kexec-bzimage64.c x86/kexec: Use up-to-dated screen_info copy to fill boot params 2020-10-14 17:05:03 +02:00
kgdb.c x86/debug: Change thread.debugreg6 to thread.virtual_dr6 2020-09-04 15:12:58 +02:00
ksysfs.c x86/boot: Fix memremap of setup_indirect structures 2022-03-16 14:16:02 +01:00
kvm.c x86, kvm: use correct GFP flags for preemption disabled 2022-06-06 08:42:43 +02:00
kvmclock.c x86/kvmclock: Move this_cpu_pvti into kvmclock.h 2021-10-06 15:55:48 +02:00
ldt.c x86/ldt: use "pr_info_once()" instead of open-coding it badly 2020-07-05 12:50:20 -07:00
machine_kexec_32.c mm: don't include asm/pgtable.h if linux/mm.h is already included 2020-06-09 09:39:13 -07:00
machine_kexec_64.c mm: don't include asm/pgtable.h if linux/mm.h is already included 2020-06-09 09:39:13 -07:00
Makefile x86/sev: Add an x86 version of cc_platform_has() 2021-11-18 14:04:32 +01:00
mmconf-fam10h_64.c
module.c x86: Undo return-thunk damage 2022-07-25 11:26:36 +02:00
mpparse.c Surgery of the MSI interrupt handling to prepare the support of upcoming 2020-10-12 11:40:41 -07:00
msr.c x86/MSR: Filter MSR writes through X86_IOC_WRMSR_REGS ioctl too 2021-03-04 11:37:26 +01:00
nmi_selftest.c
nmi.c KVM/VMX: Invoke NMI non-IST entry instead of IST entry 2021-05-19 10:12:51 +02:00
paravirt_patch.c x86/pv: Switch SWAPGS to ALTERNATIVE 2021-12-08 09:03:27 +01:00
paravirt-spinlocks.c
paravirt.c x86: Prepare inline-asm for straight-line-speculation 2022-07-25 11:26:29 +02:00
pci-dma.c dma-mapping: move dma-debug.h to kernel/dma/ 2020-10-06 07:07:05 +02:00
pci-iommu_table.c
pci-swiotlb.c
pcspeaker.c
perf_regs.c perf/arch: Remove perf_sample_data::regs_user_copy 2020-11-09 18:12:34 +01:00
platform-quirks.c
pmem.c
probe_roms.c maccess: make get_kernel_nofault() check for minimal type compatibility 2020-06-18 12:10:37 -07:00
process_32.c x86/fpu: Correct pkru/xstate inconsistency 2022-03-02 11:42:47 +01:00
process_64.c x86/fpu: Correct pkru/xstate inconsistency 2022-03-02 11:42:47 +01:00
process.c x86/bugs: Optimize SPEC_CTRL MSR writes 2022-07-25 11:26:42 +02:00
process.h
ptrace.c x86/debug: Change thread.debugreg6 to thread.virtual_dr6 2020-09-04 15:12:58 +02:00
pvclock.c
quirks.c x86, powerpc: Rename memcpy_mcsafe() to copy_mc_to_{user, kernel}() 2020-10-06 11:18:04 +02:00
reboot_fixups_32.c
reboot.c x86/mm: Flush global TLB when switching to trampoline page-table 2022-01-27 10:54:14 +01:00
relocate_kernel_32.S x86: Prepare asm files for straight-line-speculation 2022-07-25 11:26:28 +02:00
relocate_kernel_64.S x86: Prepare asm files for straight-line-speculation 2022-07-25 11:26:28 +02:00
resource.c
rtc.c
setup_percpu.c x86/mm: remove vmalloc faulting 2020-06-02 10:59:12 -07:00
setup.c x86/boot: Fix memremap of setup_indirect structures 2022-03-16 14:16:02 +01:00
sev_verify_cbit.S x86: Prepare asm files for straight-line-speculation 2022-07-25 11:26:28 +02:00
sev-es-shared.c x86/sev: Return an error on a returned non-zero SW_EXITINFO1[31:0] 2021-10-13 10:04:30 +02:00
sev-es.c x86/insn: Rename insn_decode() to insn_decode_from_regs() 2022-07-25 11:26:10 +02:00
signal_compat.c arm64: mte: Add specific SIGSEGV codes 2020-09-04 12:46:06 +01:00
signal.c x86/signal: Detect and prevent an alternate signal stack overflow 2021-07-20 16:05:50 +02:00
smp.c x86/entry: Convert reschedule interrupt to IDTENTRY_SYSVEC_SIMPLE 2020-06-11 15:15:16 +02:00
smpboot.c sched/core: Initialize the idle task with preemption disabled 2021-07-14 16:55:50 +02:00
stacktrace.c stacktrace: Remove reliable argument from arch_stack_walk() callback 2020-09-18 14:24:16 +01:00
static_call.c x86,static_call: Use alternative RET encoding 2022-07-25 11:26:37 +02:00
step.c ptrace: Reimplement PTRACE_KILL by always sending SIGKILL 2022-06-09 10:20:49 +02:00
sys_ia32.c x86: switch to kernel_clone() 2020-08-20 13:12:58 +02:00
sys_x86_64.c x86/mm: Cleanup the control_va_addr_alignment() __setup handler 2022-06-09 10:21:06 +02:00
sysfb_efi.c
sysfb_simplefb.c
sysfb.c
tboot.c mm/gup: prevent gup_fast from racing with COW during fork 2020-12-30 11:53:54 +01:00
time.c A set of fixes and updates for x86: 2020-06-11 15:54:31 -07:00
tls.c x86: switch to ->regset_get() 2020-07-27 14:31:07 -04:00
tls.h x86: switch to ->regset_get() 2020-07-27 14:31:07 -04:00
topology.c x86/headers: Remove APIC headers from <asm/smp.h> 2020-08-06 16:13:09 +02:00
trace_clock.c
tracepoint.c x86/entry: Convert reschedule interrupt to IDTENTRY_SYSVEC_SIMPLE 2020-06-11 15:15:16 +02:00
traps.c x86/traps: Mark do_int3() NOKPROBE_SYMBOL 2022-03-16 14:16:03 +01:00
tsc_msr.c Misc fixes and small updates all around the place: 2020-08-15 10:38:03 -07:00
tsc_sync.c x86/tsc: Add a timer to make sure TSC_adjust is always checked 2021-12-08 09:03:28 +01:00
tsc.c clocksource: Reduce clocksource-skew threshold 2022-01-27 10:54:05 +01:00
umip.c x86/insn: Rename insn_decode() to insn_decode_from_regs() 2022-07-25 11:26:10 +02:00
unwind_frame.c fork-v5.9 2020-08-04 14:47:45 -07:00
unwind_guess.c
unwind_orc.c x86/unwind/orc: Disable KASAN checking in the ORC unwinder, part 2 2021-03-17 17:06:35 +01:00
uprobes.c x86/uprobes: Do not use prefixes.nbytes when looping over prefixes.bytes 2020-12-06 09:58:13 +01:00
verify_cpu.S x86: Prepare asm files for straight-line-speculation 2022-07-25 11:26:28 +02:00
vm86_32.c mmap locking API: use coccinelle to convert mmap_sem rwsem call sites 2020-06-09 09:39:14 -07:00
vmlinux.lds.S x86: Add magic AMD return-thunk 2022-07-25 11:26:40 +02:00
vsmp_64.c
x86_init.c x86/irq: Cleanup the arch_*_msi_irqs() leftovers 2020-09-16 16:52:38 +02:00