AuxXxilium/linux_dsm_epyc7002
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66c117d7fa
linux_dsm_epyc7002/arch/x86
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Thomas Gleixner 66c117d7fa x86/alternatives: Make optimize_nops() interrupt safe and synced 
Richard reported the following crash:

[    0.036000] BUG: unable to handle kernel paging request at 55501e06
[    0.036000] IP: [<c0aae48b>] common_interrupt+0xb/0x38
[    0.036000] Call Trace:
[    0.036000]  [<c0409c80>] ? add_nops+0x90/0xa0
[    0.036000]  [<c040a054>] apply_alternatives+0x274/0x630

Chuck decoded:

 "  0:   8d 90 90 83 04 24       lea    0x24048390(%eax),%edx
    6:   80 fc 0f                cmp    $0xf,%ah
    9:   a8 0f                   test   $0xf,%al
 >> b:   a0 06 1e 50 55          mov    0x55501e06,%al
   10:   57                      push   %edi
   11:   56                      push   %esi

 Interrupt 0x30 occurred while the alternatives code was replacing the
 initial 0x90,0x90,0x90 NOPs (from the ASM_CLAC macro) with the
 optimized version, 0x8d,0x76,0x00. Only the first byte has been
 replaced so far, and it makes a mess out of the insn decoding."

optimize_nops() is buggy in two aspects:

- It's not disabling interrupts across the modification
- It's lacking a sync_core() call

Add both.

Fixes: 4fd4b6e553 'x86/alternatives: Use optimized NOPs for padding'
Reported-and-tested-by: "Richard W.M. Jones" <rjones@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Richard W.M. Jones <rjones@redhat.com>
Cc: Chuck Ebbert <cebbert.lkml@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1509031232340.15006@nanos
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2015-09-03 21:27:47 +02:00
..
boot x86/efi: Use all 64 bit of efi_memmap in setup_e820() 2015-07-30 18:07:10 +01:00
configs kconfig: add xenconfig defconfig helper 2015-06-16 11:04:29 +01:00
crypto crypto: aesni - fix failing setkey for rfc4106-gcm-aesni 2015-06-29 16:06:30 +08:00
entry x86: fix error handling for 32-bit compat out-of-range system call numbers 2015-08-13 16:19:44 -07:00
ia32 Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 17:59:09 -07:00
include Merge branch 'x86/cpufeature' into x86/urgent, because it's ready 2015-08-31 19:47:03 +02:00
kernel x86/alternatives: Make optimize_nops() interrupt safe and synced 2015-09-03 21:27:47 +02:00
kvm KVM: x86: Use adjustment in guest cycles when handling MSR_IA32_TSC_ADJUST 2015-08-07 13:28:03 +02:00
lguest Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 17:59:09 -07:00
lib perf/x86: Fix copy_from_user_nmi() return if range is not ok 2015-07-06 14:09:27 +02:00
math-emu x86/ldt: Further fix FPU emulation 2015-08-16 15:11:05 -07:00
mm x86/mm/srat: Print non-volatile flag in SRAT 2015-09-02 09:33:25 +02:00
net ebpf, x86: fix general protection fault when tail call is invoked 2015-07-29 17:02:19 -07:00
oprofile
pci PCI changes for the v4.2 merge window: 2015-06-23 13:41:24 -07:00
platform efi: Check for NULL efi kernel parameters 2015-07-30 18:07:11 +01:00
power x86/ldt: Make modify_ldt synchronous 2015-07-31 10:23:23 +02:00
purgatory
realmode
tools
um Merge branch 'for-linus-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml 2015-06-28 13:55:08 -07:00
video
xen xen: bug fixes for 4.2-rc6 2015-08-13 13:36:22 -07:00
.gitignore
Kbuild x86/asm/entry, x86/vdso: Move the vDSO code to arch/x86/entry/vdso/ 2015-06-03 18:51:37 +02:00
Kconfig x86/fpu, sched: Introduce CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT and use it on x86 2015-07-18 03:42:51 +02:00
Kconfig.cpu
Kconfig.debug x86/entry/64, x86/nmi/64: Add CONFIG_DEBUG_ENTRY NMI testing code 2015-07-17 12:50:14 +02:00
Makefile x86/asm/entry: Move the arch/x86/syscalls/ definitions to arch/x86/entry/syscalls/ 2015-06-04 07:37:37 +02:00
Makefile_32.cpu
Makefile.um