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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/31501] New: _dl_tlsdesc_dynamic_xsavec may clobber %rbx
Date: Sat, 16 Mar 2024 14:23:18 +0000	[thread overview]
Message-ID: <bug-31501-131@http.sourceware.org/bugzilla/> (raw)

https://sourceware.org/bugzilla/show_bug.cgi?id=31501

            Bug ID: 31501
           Summary: _dl_tlsdesc_dynamic_xsavec may clobber %rbx
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: fweimer at redhat dot com
          Reporter: fweimer at redhat dot com
  Target Milestone: ---
            Target: x86-64

I believe the stack realignment code in sysdeps/x86_64/dl-tlsdesc-dynamic.h can
clobber the initial set of saved registers (including %rbx) if the stack
alignment is unfortunate. The stack pointer is aligned down without first
decrementing it, so the created stack area can partially overlap with the part
of the red zone that was used for the initial register save.

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             reply	other threads:[~2024-03-16 14:23 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-03-16 14:23 fweimer at redhat dot com [this message]
2024-03-16 14:23 ` [Bug dynamic-link/31501] " fweimer at redhat dot com
2024-03-16 14:35 ` fweimer at redhat dot com
2024-03-16 14:48 ` hjl.tools at gmail dot com
2024-03-16 17:05 ` hjl.tools at gmail dot com
2024-03-17  4:00 ` sam at gentoo dot org
2024-03-17  8:12 ` fweimer at redhat dot com
2024-03-17 10:39 ` hjl.tools at gmail dot com
2024-03-17 10:43 ` sam at gentoo dot org
2024-03-17 10:57 ` sam at gentoo dot org
2024-03-17 16:28 ` hjl.tools at gmail dot com
2024-03-19  2:46 ` cvs-commit at gcc dot gnu.org
2024-03-19  2:46 ` hjl.tools at gmail dot com
2024-03-20 15:37 ` fweimer at redhat dot com
2024-04-02 13:17 ` carlos at redhat dot com
2024-04-03 17:43 ` cvs-commit at gcc dot gnu.org

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