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f1bdebbb67
linux/arch/x86
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Steven Rostedt (Google) a970174d7a x86/mm: Do not verify W^X at boot up 
Adding on the kernel command line "ftrace=function" triggered:

  CPA detected W^X violation: 8000000000000063 -> 0000000000000063 range: 0xffffffffc0013000 - 0xffffffffc0013fff PFN 10031b
  WARNING: CPU: 0 PID: 0 at arch/x86/mm/pat/set_memory.c:609
  verify_rwx+0x61/0x6d
  Call Trace:
     __change_page_attr_set_clr+0x146/0x8a6
     change_page_attr_set_clr+0x135/0x268
     change_page_attr_clear.constprop.0+0x16/0x1c
     set_memory_x+0x2c/0x32
     arch_ftrace_update_trampoline+0x218/0x2db
     ftrace_update_trampoline+0x16/0xa1
     __register_ftrace_function+0x93/0xb2
     ftrace_startup+0x21/0xf0
     register_ftrace_function_nolock+0x26/0x40
     register_ftrace_function+0x4e/0x143
     function_trace_init+0x7d/0xc3
     tracer_init+0x23/0x2c
     tracing_set_tracer+0x1d5/0x206
     register_tracer+0x1c0/0x1e4
     init_function_trace+0x90/0x96
     early_trace_init+0x25c/0x352
     start_kernel+0x424/0x6e4
     x86_64_start_reservations+0x24/0x2a
     x86_64_start_kernel+0x8c/0x95
     secondary_startup_64_no_verify+0xe0/0xeb

This is because at boot up, kernel text is writable, and there's no
reason to do tricks to updated it.  But the verifier does not
distinguish updates at boot up and at run time, and causes a warning at
time of boot.

Add a check for system_state == SYSTEM_BOOTING and allow it if that is
the case.

[ These SYSTEM_BOOTING special cases are all pretty horrid, but the x86
  text_poke() code does some odd things at bootup, forcing this for now
    - Linus ]

Link: https://lore.kernel.org/r/20221024112730.180916b3@gandalf.local.home
Fixes: 652c5bf380 ("x86/mm: Refuse W^X violations")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-10-24 18:05:27 -07:00
..
boot - Yu Zhao's Multi-Gen LRU patches are here. They've been under test in 2022-10-10 17:53:04 -07:00
coco x86/tdx: Handle load_unaligned_zeropad() page-cross to a shared page 2022-06-17 15:37:33 -07:00
configs x86/defconfig: Enable CONFIG_DEBUG_WX=y 2022-09-02 10:41:42 +02:00
crypto This update includes the following changes: 2022-10-10 13:04:25 -07:00
entry treewide: use prandom_u32_max() when possible, part 1 2022-10-11 17:42:55 -06:00
events perf/x86/intel/lbr: Use setup_clear_cpu_cap() instead of clear_cpu_cap() 2022-10-20 17:10:28 +02:00
hyperv x86/hyperv: Replace kmap() with kmap_local_page() 2022-10-03 08:49:48 +00:00
ia32 x86: Remove a.out support 2022-04-11 18:04:27 +02:00
include iommu/vt-d: Allow NVS regions in arch_rmrr_sanity_check() 2022-10-21 10:49:35 +02:00
kernel - Fix ORC stack unwinding when GCOV is enabled 2022-10-23 10:07:01 -07:00
kvm KVM: x86: Add compat handler for KVM_X86_SET_MSR_FILTER 2022-10-22 05:16:04 -04:00
lib - Yu Zhao's Multi-Gen LRU patches are here. They've been under test in 2022-10-10 17:53:04 -07:00
math-emu x86/32: Remove lazy GS macros 2022-04-14 14:09:43 +02:00
mm x86/mm: Do not verify W^X at boot up 2022-10-24 18:05:27 -07:00
net bpf: Fix dispatcher patchable function entry to 5 bytes nop 2022-10-20 18:57:51 -07:00
pci x86/PCI: Revert "x86/PCI: Clip only host bridge windows for E820 regions" 2022-06-17 14:24:14 -05:00
platform EFI updates for v6.1 2022-10-09 08:56:54 -07:00
power x86/cpu: Load microcode during restore_processor_state() 2022-04-19 19:37:05 +02:00
purgatory x86/purgatory: Disable CFI 2022-09-26 10:13:16 -07:00
ras
realmode x86: kmsan: disable instrumentation of unsupported code 2022-10-03 14:03:24 -07:00
tools x86/tools/relocs: Ignore __kcfi_typeid_ relocations 2022-09-26 10:13:15 -07:00
um arch: um: Mark the stack non-executable to fix a binutils warning 2022-09-21 09:11:42 +02:00
video
virt/vmx/tdx x86/tdx: Provide common base for SEAMCALL and TDCALL C wrappers 2022-04-07 08:27:50 -07:00
xen xen: branch for v6.1-rc1 2022-10-12 14:39:38 -07:00
.gitignore x86/purgatory: Omit use of bin2c 2022-07-25 10:32:32 +02:00
Kbuild
Kconfig x86/Kconfig: Drop check for -mabi=ms for CONFIG_EFI_STUB 2022-10-17 19:11:16 +02:00
Kconfig.assembler
Kconfig.cpu
Kconfig.debug arch: make TRACE_IRQFLAGS_NMI_SUPPORT generic 2022-06-23 15:39:21 +01:00
Makefile Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Makefile_32.cpu
Makefile.um