Tony Luck c0ab7ffce2 x86/mce: Recover from poison found while copying from user space ... Existing kernel code can only recover from a machine check on code that is tagged in the exception table with a fault handling recovery path. Add two new fields in the task structure to pass information from machine check handler to the "task_work" that is queued to run before the task returns to user mode: + mce_vaddr: will be initialized to the user virtual address of the fault in the case where the fault occurred in the kernel copying data from a user address. This is so that kill_me_maybe() can provide that information to the user SIGBUS handler. + mce_kflags: copy of the struct mce.kflags needed by kill_me_maybe() to determine if mce_vaddr is applicable to this error. Add code to recover from a machine check while copying data from user space to the kernel. Action for this case is the same as if the user touched the poison directly; unmap the page and send a SIGBUS to the task. Use a new helper function to share common code between the "fault in user mode" case and the "fault while copying from user" case. New code paths will be activated by the next patch which sets MCE_IN_KERNEL_COPYIN. Suggested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20201006210910.21062-6-tony.luck@intel.com		2020-10-07 11:29:41 +02:00
..
acpi	mm: reorder includes after introduction of linux/pgtable.h	2020-06-09 09:39:13 -07:00
apic	A set of locking fixes and updates:	2020-08-10 19:07:44 -07:00
cpu	x86/mce: Recover from poison found while copying from user space	2020-10-07 11:29:41 +02:00
fpu	Misc fixes and small updates all around the place:	2020-08-15 10:38:03 -07:00
kprobes	Merge branch 'perf/vlbr'	2020-07-02 15:51:48 +02:00
.gitignore	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
alternative.c	Misc fixes and small updates all around the place:	2020-08-15 10:38:03 -07:00
amd_gart_64.c	docs: fix references for DMA*.txt files	2020-06-26 10:01:32 -06:00
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.c	efi/x86: Avoid using code32_start	2020-03-08 09:58:17 +01:00
asm-offsets_32.c	x86 entry code updates:	2020-03-30 19:14:28 -07:00
asm-offsets_64.c	x86/entry: Remove DBn stacks	2020-06-11 15:15:23 +02:00
audit_64.c	x86/audit: Fix a -Wmissing-prototypes warning for ia32_classify_syscall()	2020-05-19 18:03:07 +02:00
bootflag.c
check.c
cpuid.c
crash.c	x86/crash: Correct the address boundary of function parameters	2020-08-07 01:32:00 +02:00
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	fs/core/vmcore: Move sev_active() reference to x86 arch code	2019-08-09 22:52:10 +10:00
devicetree.c	x86/headers: Remove APIC headers from <asm/smp.h>	2020-08-06 16:13:09 +02:00
doublefault_32.c	x86/entry: Convert double fault exception to IDTENTRY_DF	2020-06-11 15:15:03 +02:00
dumpstack.c	Improve x86 debuggability: print registers with the same log level as the backtrace.	2020-08-03 17:00:00 -07:00
dumpstack_32.c	x86/32: Remove CONFIG_DOUBLEFAULT	2020-04-14 14:24:05 +02:00
dumpstack_64.c	x86/entry: Remove DBn stacks	2020-06-11 15:15:23 +02:00
e820.c	Rebase locking/kcsan to locking/urgent	2020-06-11 20:02:46 +02:00
early-quirks.c	x86/gpu: add RKL stolen memory support	2020-05-20 08:35:22 -07:00
early_printk.c	mm: reorder includes after introduction of linux/pgtable.h	2020-06-09 09:39:13 -07:00
ebda.c
eisa.c
espfix_64.c	mm: introduce include/linux/pgtable.h	2020-06-09 09:39:13 -07:00
ftrace.c	x86/ftrace: Do not jump to direct code in created trampolines	2020-06-29 11:42:48 -04:00
ftrace_32.S	x86: Change {JMP,CALL}_NOSPEC argument	2020-04-30 20:14:34 +02:00
ftrace_64.S	x86/ftrace: Do not jump to direct code in created trampolines	2020-06-29 11:42:48 -04:00
head32.c
head64.c	mm: reorder includes after introduction of linux/pgtable.h	2020-06-09 09:39:13 -07:00
head_32.S	x86/xen: remove 32-bit Xen PV guest support	2020-08-11 08:26:48 +02:00
head_64.S	x86/entry: Remove the apic/BUILD interrupt leftovers	2020-06-11 15:15:16 +02:00
hpet.c	remove ioremap_nocache and devm_ioremap_nocache	2020-01-06 09:45:59 +01:00
hw_breakpoint.c	x86/entry: Optimize local_db_save() for virt	2020-06-11 15:15:22 +02:00
i8237.c
i8253.c
i8259.c	x86/i8259: Use printk_deferred() to prevent deadlock	2020-07-29 16:27:16 +02:00
idt.c	x86/idt: Make idt_descr static	2020-06-20 11:47:35 +02:00
ima_arch.c	EFI updates for v5.7:	2020-02-26 15:21:22 +01:00
io_delay.c
ioport.c	x86/ioperm: Prevent a memory leak when fork fails	2020-05-28 21:36:20 +02:00
irq.c	x86/entry: Convert KVM vectors to IDTENTRY_SYSVEC*	2020-06-11 15:15:15 +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/entry/64: Move do_softirq_own_stack() to C	2020-06-11 15:15:07 +02:00
irq_work.c	x86/entry: Convert various system vectors	2020-06-11 15:15:14 +02:00
irqflags.S	x86/asm: Change all ENTRY+ENDPROC to SYM_FUNC_*	2019-10-18 11:58:33 +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: Introduce setup_indirect	2019-11-12 16:21:15 +01:00
kexec-bzimage64.c	x86/efi: Remove references to no-longer-used efi_have_uv1_memmap()	2020-07-17 16:47:47 +02:00
kgdb.c	maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault	2020-06-17 10:57:41 -07:00
ksysfs.c	x86/boot: Introduce setup_indirect	2019-11-12 16:21:15 +01:00
kvm.c	s390: implement diag318	2020-08-06 12:59:31 -07:00
kvmclock.c	x86/vdso: Use generic VDSO clock mode storage	2020-02-17 14:40:23 +01:00
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	Rebase locking/kcsan to locking/urgent	2020-06-11 20:02:46 +02:00
mmconf-fam10h_64.c
module.c	mm: don't include asm/pgtable.h if linux/mm.h is already included	2020-06-09 09:39:13 -07:00
mpparse.c	A set of locking fixes and updates:	2020-08-10 19:07:44 -07:00
msr.c	x86/msr: Filter MSR writes	2020-06-25 10:39:02 +02:00
nmi.c	x86/entry: Fix NMI vs IRQ state tracking	2020-07-10 12:00:01 +02:00
nmi_selftest.c
paravirt-spinlocks.c
paravirt.c	x86/ioperm: Fix io bitmap invalidation on Xen PV	2020-07-18 12:31:49 +02:00
paravirt_patch.c
pci-dma.c	dma-mapping updates for 5.5-rc1	2019-11-28 11:16:43 -08:00
pci-iommu_table.c
pci-swiotlb.c	dma-mapping: fix filename references	2019-09-03 08:36:30 +02:00
pcspeaker.c
perf_regs.c
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.c	Support for FSGSBASE. Almost 5 years after the first RFC to support it,	2020-08-04 21:16:22 -07:00
process.h	x86: Use the correct SPDX License Identifier in headers	2019-10-01 20:31:35 +02:00
process_32.c	x86/dumpstack: Add log_lvl to __show_regs()	2020-07-22 23:56:53 +02:00
process_64.c	x86/fsgsbase/64: Fix NULL deref in 86_fsgsbase_read_task	2020-08-14 13:30:18 -07:00
ptrace.c	Merge branch 'work.regset' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-08-07 09:29:25 -07:00
pvclock.c	x86/vdso: Use generic VDSO clock mode storage	2020-02-17 14:40:23 +01:00
quirks.c	x86, powerpc: Rename memcpy_mcsafe() to copy_mc_to_{user, kernel}()	2020-10-06 11:18:04 +02:00
reboot.c	A set of fixes and updates for x86:	2020-06-11 15:54:31 -07:00
reboot_fixups_32.c
relocate_kernel_32.S	x86/asm: Annotate relocate_kernel_{32,64}.c	2019-10-18 09:53:19 +02:00
relocate_kernel_64.S	x86/kexec: Make relocate_kernel_64.S objtool clean	2020-03-25 18:28:28 +01:00
resource.c
rtc.c
setup.c	A set of locking fixes and updates:	2020-08-10 19:07:44 -07:00
setup_percpu.c	x86/mm: remove vmalloc faulting	2020-06-02 10:59:12 -07:00
signal.c	x86/entry: Use generic syscall exit functionality	2020-07-24 15:04:59 +02:00
signal_compat.c
smp.c	x86/entry: Convert reschedule interrupt to IDTENTRY_SYSVEC_SIMPLE	2020-06-11 15:15:16 +02:00
smpboot.c	Misc changes:	2020-08-03 17:08:02 -07:00
stacktrace.c	x86/stacktrace: Fix reliable check for empty user task stacks	2020-07-22 23:47:47 +02:00
step.c
sys_ia32.c	fork: fold legacy_clone_args_valid() into _do_fork()	2020-06-22 14:38:38 +02:00
sys_x86_64.c	x86: Remove unneeded includes	2020-03-21 16:03:25 +01:00
sysfb.c
sysfb_efi.c	x86/sysfb_efi: Add quirks for some devices with swapped width and height	2019-07-22 10:47:11 +02:00
sysfb_simplefb.c	x86/sysfb: Fix check for bad VRAM size	2020-01-20 10:57:53 +01:00
tboot.c	mmap locking API: add MMAP_LOCK_INITIALIZER	2020-06-09 09:39:14 -07:00
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	mm: remove unneeded includes of <asm/pgalloc.h>	2020-08-07 11:33:26 -07:00
tsc.c	x86/tsc: Add tsc_early_khz command line parameter	2020-05-21 23:07:00 +02:00
tsc_msr.c	Misc fixes and small updates all around the place:	2020-08-15 10:38:03 -07:00
tsc_sync.c	x86: Fix a handful of typos	2020-02-16 20:58:06 +01:00
umip.c	x86/umip: Make umip_insns static	2020-04-15 11:13:12 +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: Fix ORC for newly forked tasks	2020-07-22 23:47:47 +02:00
uprobes.c	x86/apic, x86/uprobes: Correct parameter names in kernel-doc comments	2019-10-27 09:00:28 +01:00
verify_cpu.S	x86/asm: Annotate local pseudo-functions	2019-10-18 10:04:04 +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, vmlinux.lds: Page-align end of ..page_aligned sections	2020-07-22 09:38:37 +02:00
vsmp_64.c
x86_init.c	x86/kvm: Handle async page faults directly through do_page_fault()	2020-05-19 15:53:57 +02:00