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From: Jeff Law <jeffreyalaw@gmail.com>
To: Marek Polacek <polacek@redhat.com>,
	GCC Patches <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH] configure: Implement --enable-host-bind-now
Date: Fri, 19 May 2023 15:29:44 -0600	[thread overview]
Message-ID: <1b19e831-95e0-490a-d6d5-0c65b89dc696@gmail.com> (raw)
In-Reply-To: <ZGOjIunxHFQLfzQQ@redhat.com>



On 5/16/23 09:37, Marek Polacek via Gcc-patches wrote:
> As promised in the --enable-host-pie patch, this patch adds another
> configure option, --enable-host-bind-now, which adds -z now when linking
> the compiler executables in order to extend hardening.  BIND_NOW with RELRO
> allows the GOT to be marked RO; this prevents GOT modification attacks.
> 
> This option does not affect linking of target libraries; you can use
> LDFLAGS_FOR_TARGET=-Wl,-z,relro,-z,now to enable RELRO/BIND_NOW.
> 
> With this patch:
> $ readelf -Wd cc1{,plus} | grep FLAGS
>   0x000000000000001e (FLAGS)              BIND_NOW
>   0x000000006ffffffb (FLAGS_1)            Flags: NOW PIE
>   0x000000000000001e (FLAGS)              BIND_NOW
>   0x000000006ffffffb (FLAGS_1)            Flags: NOW PIE
> 
> Bootstrapped/regtested on x86_64-pc-linux-gnu, ok for trunk?
> 
> c++tools/ChangeLog:
> 
> 	* configure.ac (--enable-host-bind-now): New check.
> 	* configure: Regenerate.
> 
> gcc/ChangeLog:
> 
> 	* configure.ac (--enable-host-bind-now): New check.  Add
> 	-Wl,-z,now to LD_PICFLAG if --enable-host-bind-now.
> 	* configure: Regenerate.
> 	* doc/install.texi: Document --enable-host-bind-now.
> 
> lto-plugin/ChangeLog:
> 
> 	* configure.ac (--enable-host-bind-now): New check.  Link with
> 	-z,now.
> 	* configure: Regenerate.
OK
jeff

  reply	other threads:[~2023-05-19 21:29 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-16 15:37 Marek Polacek
2023-05-19 21:29 ` Jeff Law [this message]
2023-06-27 11:39 ` Martin Jambor
2023-06-27 15:31   ` Marek Polacek
2023-06-27 15:50     ` Iain Sandoe
2023-06-27 17:06     ` Eric Botcazou
2023-06-29 15:58     ` Martin Jambor
2023-06-29 16:13       ` Marek Polacek
2023-06-30 11:33         ` [committed] Regenrate lto-plugin/Makefile.in Martin Jambor
  -- strict thread matches above, loose matches on Subject: below --
2022-11-11  2:53 [PATCH] configure: Implement --enable-host-bind-now Marek Polacek
2022-11-20 15:09 ` Jeff Law
2022-02-10 16:50 Marek Polacek

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