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From: "jakub at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/31402] New: clone (NULL, NULL, ...) clobbers %r7 register
 on s390{,x}
Date: Mon, 19 Feb 2024 14:58:57 +0000
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X-Bugzilla-Component: libc
X-Bugzilla-Version: 2.40
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31402

            Bug ID: 31402
           Summary: clone (NULL, NULL, ...) clobbers %r7 register on
                    s390{,x}
           Product: glibc
           Version: 2.40
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: jakub at redhat dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Initially filed in https://gcc.gnu.org/PR113991, but it looks like a glibc =
bug
to me.
vsftpd for some strange reason does:
int ret =3D clone(NULL, NULL, CLONE_NEWPID | CLONE_NEWIPC | SIGCHLD, NULL);
My reading of glibc sources is that this results always in -1/EINVAL without
invoking the syscall.
Anyway, since
https://sourceware.org/git/?p=3Dglibc.git;a=3Dcommit;h=3De57d8fc97b90127de4=
ed3e3a9cdf663667580935
if the first or second clone argument is NULL, it will return -1/EINVAL, but
clobber the call-saved %r7 register.
I think error: label should either lm{,g} %r6,%7 or l{,g} %r7.

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