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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/111736] Address sanitizer is not compatible with
 named address spaces
Date: Tue, 21 May 2024 09:01:12 +0000
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X-Bugzilla-Component: sanitizer
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X-Bugzilla-Keywords: addr-space, wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111736

--- Comment #46 from Uro=C5=A1 Bizjak <ubizjak at gmail dot com> ---
Created attachment 58259
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D58259&action=3Dedit
Preprocessed file

gcc -O2 -fsanitize=3Dkernel-address -fasan-shadow-offset=3D0xdffffc00000000=
00
--param asan-instrumentation-with-call-threshold=3D10000 -fsanitize=3Dbool =
-S
alternative.i

results in:

        movabsq $-2305847407260205056, %rdx
        movl    $cpu_tlbstate_shared, %eax
        shrq    $3, %rax
        movzbl  (%rax,%rdx), %eax
        testb   %al, %al
        je      .L399
        jle     .L473
.L399:
        movzbl  %gs:cpu_tlbstate_shared(%rip), %r14d
        cmpb    $1, %r14b

which is wrong. %gs: prefixed addresses should not be sanitized.=