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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] New: Address sanitizer is not compatible with
 named address spaces
Date: Mon, 09 Oct 2023 11:53:10 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: sanitizer
X-Bugzilla-Version: 12.1.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111736

            Bug ID: 111736
           Summary: Address sanitizer is not compatible with named address
                    spaces
           Product: gcc
           Version: 12.1.0
            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, marxi=
n at gcc dot gnu.org
  Target Milestone: ---

>From [1], gcc is doing a KASAN check on a percpu address (when percpu acces=
s is
implemented using named address spaces). This is not a "real" address, just=
 an
offset from the segment register.

The testcase

--cut here--
int __seg_gs m;

int foo (void)
{
  return m;
}
--cut here--

does not show any special handling that would handle segment registers.

[1]
https://lore.kernel.org/lkml/CAHk-=3Dwi6U-O1wdPOESuCE6QO2OaPu0hEzaig0uDOU4L=
5CREhug@mail.gmail.com/=