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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/115172] New: Invalid -fsanitize=bool sanitization of
 variable from named address space
Date: Tue, 21 May 2024 09:33:26 +0000
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X-Bugzilla-Version: 14.1.1
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115172

            Bug ID: 115172
           Summary: Invalid -fsanitize=3Dbool sanitization of variable from
                    named address space
           Product: gcc
           Version: 14.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ubizjak at gmail dot com
                CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
                    jakub at gcc dot gnu.org, kcc at gcc dot gnu.org
  Target Milestone: ---

Created attachment 58260
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D58260&action=3Dedit
Preprocessed file

Originally reported in PR 111736, comment 42.

Compiling the attached preprocessed file with:

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.

Omitting -fsanitize=3Dbool from the above compiles the preprocessed file to:

        movzbl  %gs:cpu_tlbstate_shared(%rip), %eax
        testb   %al, %al

where no sanitization is present with the above variable.=