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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/arch
История
Bill Wendling 8c86f29bfb x86/paravirt: add extra clobbers with ZERO_CALL_USED_REGS enabled 
The ZERO_CALL_USED_REGS feature may zero out caller-saved registers
before returning.

In spurious_kernel_fault(), the "pte_offset_kernel()" call results in
this assembly code:

.Ltmp151:
        #APP
        # ALT: oldnstr
.Ltmp152:
.Ltmp153:
.Ltmp154:
        .section        .discard.retpoline_safe,"",@progbits
        .quad   .Ltmp154
        .text

        callq   *pv_ops+536(%rip)

.Ltmp155:
        .section        .parainstructions,"a",@progbits
        .p2align        3, 0x0
        .quad   .Ltmp153
        .byte   67
        .byte   .Ltmp155-.Ltmp153
        .short  1
        .text
.Ltmp156:
        # ALT: padding
        .zero   (-(((.Ltmp157-.Ltmp158)-(.Ltmp156-.Ltmp152))>0))*((.Ltmp157-.Ltmp158)-(.Ltmp156-.Ltmp152)),144
.Ltmp159:
        .section        .altinstructions,"a",@progbits
.Ltmp160:
        .long   .Ltmp152-.Ltmp160
.Ltmp161:
        .long   .Ltmp158-.Ltmp161
        .short  33040
        .byte   .Ltmp159-.Ltmp152
        .byte   .Ltmp157-.Ltmp158
        .text

        .section        .altinstr_replacement,"ax",@progbits
        # ALT: replacement 1
.Ltmp158:
        movq    %rdi, %rax
.Ltmp157:
        .text
        #NO_APP
.Ltmp162:
        testb   $-128, %dil

The "testb" here is using %dil, but the %rdi register was cleared before
returning from "callq *pv_ops+536(%rip)". Adding the proper constraints
results in the use of a different register:

        movq    %r11, %rdi

        # Similar to above.

        testb   $-128, %r11b

Link: https://github.com/KSPP/linux/issues/192
Signed-off-by: Bill Wendling <morbo@google.com>
Reported-and-tested-by: Nathan Chancellor <nathan@kernel.org>
Fixes: 035f7f87b7 ("randstruct: Enable Clang support")
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/lkml/fa6df43b-8a1a-8ad1-0236-94d2a0b588fa@suse.com/
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220902213750.1124421-3-morbo@google.com
 		2022-09-26 11:39:27 -07:00
..
alpha Bitmap patches for v6.0-rc1 2022-08-07 17:52:35 -07:00
arc Kbuild updates for v5.20 2022-08-10 10:40:41 -07:00
arm ARM: decompressor: Include .data.rel.ro.local 2022-09-21 20:16:14 -07:00
arm64 KVM/arm64 fixes for 6.0, take #1 2022-08-19 05:43:53 -04:00
csky Merge 'irq/loongarch', 'pci/ctrl/loongson' and 'pci/header-cleanup-immutable' 2022-08-11 21:06:14 +08:00
hexagon Bitmap patches for v6.0-rc1 2022-08-07 17:52:35 -07:00
ia64 Bitmap patches for v6.0-rc1 2022-08-07 17:52:35 -07:00
loongarch irqchip fixes for 6.0, take #1 2022-08-18 17:37:22 +02:00
m68k Fixes include: 2022-08-09 09:39:25 -07:00
microblaze - The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe 2022-08-05 16:32:45 -07:00
mips KVM: Rename mmu_notifier_* to mmu_invalidate_* 2022-08-19 04:05:41 -04:00
nios2 nios2: add force_successful_syscall_return() 2022-08-15 11:25:32 -05:00
openrisc Updates to various subsystems which I help look after. lib, ocfs2, 2022-08-07 10:03:24 -07:00
parisc Merge 'irq/loongarch', 'pci/ctrl/loongson' and 'pci/header-cleanup-immutable' 2022-08-11 21:06:14 +08:00
powerpc powerpc fixes for 6.0 #3 2022-08-20 11:20:37 -07:00
riscv RISC-V Fixes for 6.0-rc2 2022-08-19 13:49:07 -07:00
s390 s390/hypfs: avoid error message under KVM 2022-08-15 17:19:51 +02:00
sh sh: machvec: Use char[] for section boundaries 2022-09-13 10:33:17 -07:00
sparc Merge 'irq/loongarch', 'pci/ctrl/loongson' and 'pci/header-cleanup-immutable' 2022-08-11 21:06:14 +08:00
um um: Enable FORTIFY_SOURCE 2022-09-07 16:37:27 -07:00
x86 x86/paravirt: add extra clobbers with ZERO_CALL_USED_REGS enabled 2022-09-26 11:39:27 -07:00
xtensa Merge 'irq/loongarch', 'pci/ctrl/loongson' and 'pci/header-cleanup-immutable' 2022-08-11 21:06:14 +08:00
.gitignore
…
Kconfig asm goto: eradicate CC_HAS_ASM_GOTO 2022-08-21 10:06:28 -07:00