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From: "ldv at sourceware dot org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/30173] New: siginfo_t does not provide si_trapno field on
 alpha
Date: Sun, 26 Feb 2023 08:29:14 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: glibc
X-Bugzilla-Component: libc
X-Bugzilla-Version: 2.37
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: ldv at sourceware dot org
X-Bugzilla-Status: NEW
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X-Bugzilla-Priority: P2
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30173

            Bug ID: 30173
           Summary: siginfo_t does not provide si_trapno field on alpha
           Product: glibc
           Version: 2.37
               URL: https://github.com/strace/strace/issues/220
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: ldv at sourceware dot org
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---
              Host: alpha-unknown-linux-gnu
            Target: alpha-unknown-linux-gnu
             Build: alpha-unknown-linux-gnu
             Flags: security-

Starting with commit 4c0a1e6392fc9f667dba272dc13d94dc5c54813e aka
glibc-2.20~469, siginfo_t no longer provides si_trapno field on alpha, desp=
ite
that the linux kernel headers still provide it.

This regression was discovered accidentally when strace-5.19 started to use
si_trapno and subsequently failed to build on alpha in the debian buildd
infrastructure.

Also note that linux kernel commit add0b32ef9146a8559a60aed54c37692a5f9d34f=
 aka
v5.13-rc3~17^2~4 moved si_trapno inside the union, that change resulted in a
difference in siginfo field placement on sparc and alpha for the fields
si_addr_lsb, si_lower, si_upper, and si_pkey.  This means that glibc defini=
tion
of siginfo_t is out of sync with the kernel one not just on alpha but on sp=
arc
as well.

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