[Bug libc/27068] New: Static binaries SIGILL when BTI is enabled on aarch64

[Bug libc/27068] New: Static binaries SIGILL when BTI is enabled on aarch64

[guillaume.gardet at arm dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27068

            Bug ID: 27068
           Summary: Static binaries SIGILL when BTI is enabled on aarch64
           Product: glibc
           Version: 2.32
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: guillaume.gardet at arm dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Created attachment 13050
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13050&action=edit
add_bti_landing_pad.patch

While testing BTI on openSUSE Tumbleweed on aarch64, it showed a SIGILL error
while running ldconfig, which is statically compiled.

To workaround/fix the problem, I applied the attached patch which add a BTI
landing pad for static binaries, with PIC enabled.

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[Bug libc/27068] Static binaries SIGILL when BTI is enabled on aarch64

[adhemerval.zanella at linaro dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27068

Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |adhemerval.zanella at linaro dot o
                   |                            |rg

--- Comment #1 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
Could you send a patch for this issue on libc-alpha? I think it should be a
release blocker for 2.33.

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[Bug libc/27068] Static binaries SIGILL when BTI is enabled on aarch64

[nsz at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27068

Szabolcs Nagy <nsz at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at sourceware dot org   |nsz at gcc dot gnu.org
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2020-12-14
     Ever confirmed|0                           |1
                 CC|                            |nsz at gcc dot gnu.org

--- Comment #2 from Szabolcs Nagy <nsz at gcc dot gnu.org> ---
yeah it seems the -static-pie case was not tested and was broken, i'll take
this.

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[Bug libc/27068] Static PIE binaries SIGILL when BTI is enabled on aarch64

[nsz at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27068

Szabolcs Nagy <nsz at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Static binaries SIGILL when |Static PIE binaries SIGILL
                   |BTI is enabled on aarch64   |when BTI is enabled on
                   |                            |aarch64

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[Bug libc/27068] Static PIE binaries SIGILL when BTI is enabled on aarch64

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27068

--- Comment #3 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Szabolcs Nagy <nsz@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d4136903a29baabeec8987b53081def8b4a49826

commit d4136903a29baabeec8987b53081def8b4a49826
Author: Guillaume Gardet <guillaume.gardet@arm.com>
Date:   Mon Dec 14 15:38:22 2020 +0000

    aarch64: fix static PIE start code for BTI [BZ #27068]

    A bti c was missing from rcrt1.o which made all -static-pie
    binaries fail at program startup on BTI enabled systems.

    Fixes bug 27068.

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[Bug libc/27068] Static PIE binaries SIGILL when BTI is enabled on aarch64

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27068

--- Comment #4 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The release/2.32/master branch has been updated by Szabolcs Nagy
<nsz@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d3cb8f6222a3cb955712b720d7c0c0dba37898f9

commit d3cb8f6222a3cb955712b720d7c0c0dba37898f9
Author: Guillaume Gardet <guillaume.gardet@arm.com>
Date:   Mon Dec 14 15:38:22 2020 +0000

    aarch64: fix static PIE start code for BTI [BZ #27068]

    A bti c was missing from rcrt1.o which made all -static-pie
    binaries fail at program startup on BTI enabled systems.

    Fixes bug 27068.

    (cherry picked from commit d4136903a29baabeec8987b53081def8b4a49826)

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[Bug libc/27068] Static PIE binaries SIGILL when BTI is enabled on aarch64

[nsz at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27068

Szabolcs Nagy <nsz at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
   Target Milestone|---                         |2.33
               Host|                            |aarch64
             Status|NEW                         |RESOLVED

--- Comment #5 from Szabolcs Nagy <nsz at gcc dot gnu.org> ---
fixed for 2.33

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