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From: "kito at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug sanitizer/96307] [10 Regression] ICE in sanopt on riscv64 since
 r11-2283-g2ca1b6d009b194286c3ec91f9c51cc6b0a475458
Date: Tue, 16 Mar 2021 10:37:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96307

--- Comment #12 from Kito Cheng <kito at gcc dot gnu.org> ---
> This disables the CC_HAS_KASAN_GENERIC config of the kernel, making KASAN=
 unavailable.

Hmmmm, I checked with kernel source code, it only feed
-fsanitize=3Dkernel-address during checking, but in fact it must work with
-fasan-shadow-offset=3D, and it does actually, what do you think about fix =
that
on kernel side?

diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
index fba9909e31b7..9a2484132b2d 100644
--- a/lib/Kconfig.kasan
+++ b/lib/Kconfig.kasan
@@ -13,7 +13,7 @@ config HAVE_ARCH_KASAN_VMALLOC
        bool

 config CC_HAS_KASAN_GENERIC
-       def_bool $(cc-option, -fsanitize=3Dkernel-address)
+       def_bool $(cc-option, -fsanitize=3Dkernel-address
-fasan-shadow-offset=3D0x1)

 config CC_HAS_KASAN_SW_TAGS
        def_bool $(cc-option, -fsanitize=3Dkernel-hwaddress)


> Also, the warning text doesn't make sense:
>
> $ gcc -fsanitize=3Dkernel-address -S -xc /dev/null -o /dev/null
> cc1: warning: =E2=80=98-fsanitize=3Dkernel-address=E2=80=99 with stack pr=
otection is not supported without =E2=80=98-fasan-shadow-offset=3D=E2=80=99=
 for this target

That's my fault I didn't update the error message there, that error message=
 was
introduced when fixing PR96260, but during fix this PR.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96260=