[Bug gdb/29907] New: gdb tries to open /proc/pid/mem even for --version

[Bug gdb/29907] New: gdb tries to open /proc/pid/mem even for --version

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29907

            Bug ID: 29907
           Summary: gdb tries to open /proc/pid/mem even for --version
           Product: gdb
           Version: unknown
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: sam at gentoo dot org
                CC: pedro at palves dot net
  Target Milestone: ---

Build systems (like QEMU's, apparently) may call 'gdb --version' to check gdb's
presence & its version on the system.

As of 1bcb0708f22956d5128a2e75df6eba5a18327892, gdb will check if /proc/pid/mem
is writable, including for 'gdb --version' calls.

Gentoo's build process has sandboxing which blocks this access and then as a
result the build fails.

Is it possible to skip this the /proc/pid/mem check for simple --version
invocations? Thanks.

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[Bug gdb/29907] gdb tries to open /proc/pid/mem even for --version

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29907

Sam James <sam at gentoo dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|unknown                     |HEAD
           See Also|                            |https://bugs.gentoo.org/sho
                   |                            |w_bug.cgi?id=886189

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[Bug gdb/29907] gdb tries to open /proc/pid/mem even for --version

[pedro at palves dot net]

https://sourceware.org/bugzilla/show_bug.cgi?id=29907

Pedro Alves <pedro at palves dot net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at sourceware dot org   |pedro at palves dot net

--- Comment #1 from Pedro Alves <pedro at palves dot net> ---
Fix posted here:

 [PATCH] Delay checking whether /proc/pid/mem is writable (PR gdb/29907)
 https://sourceware.org/pipermail/gdb-patches/2022-December/194817.html

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[Bug gdb/29907] gdb tries to open /proc/pid/mem even for --version

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29907

--- Comment #2 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Pedro Alves <palves@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=9dff6a5d54f212f875b6551444393691a2410f3e

commit 9dff6a5d54f212f875b6551444393691a2410f3e
Author: Pedro Alves <pedro@palves.net>
Date:   Fri Dec 16 12:04:54 2022 +0000

    Delay checking whether /proc/pid/mem is writable (PR gdb/29907)

    As of 1bcb0708f229 ("gdb/linux-nat: Check whether /proc/pid/mem is
    writable"), GDB checks if /proc/pid/mem is writable.  This is done
    early at GDB startup, in order to get a consistent warning, instead of
    a warning that depends on whenever GDB writes to inferior memory.

    PR gdb/29907 points out that some build systems (like QEMU's,
    apparently) may call 'gdb --version' to check GDB's presence & its
    version on the system, and that Gentoo's build process has sandboxing
    which blocks the /proc/pid/mem access and thus GDB warns, which
    results in build fails.

    To help with that, this patch delays the /proc/pid/mem check until we
    start or attach to an inferior.  Ends up potentially emiting a warning
    close where we already emit other ptrace- and /proc- related warnings,
    which just Feels Right.

    Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29907
    Change-Id: I5537653ecfbbe76a04ab035e40e59d09b4980763

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[Bug gdb/29907] gdb tries to open /proc/pid/mem even for --version

[pedro at palves dot net]

https://sourceware.org/bugzilla/show_bug.cgi?id=29907

Pedro Alves <pedro at palves dot net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #3 from Pedro Alves <pedro at palves dot net> ---
Fixed.

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[Bug gdb/29907] gdb tries to open /proc/pid/mem even for --version

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29907

--- Comment #4 from Sam James <sam at gentoo dot org> ---
Many thanks for the speedy resolution!

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