From: Siddhesh Poyarekar <siddhesh@gotplt.org>
To: "Frédéric Bérat" <fberat@redhat.com>, libc-alpha@sourceware.org
Subject: Re: [PATCH v3 07/16] misc/sys/cdefs.h: Create FORTIFY redirects for internal calls
Date: Fri, 30 Jun 2023 11:13:20 -0400 [thread overview]
Message-ID: <ac95d238-f0d4-b978-409b-42af63d96007@gotplt.org> (raw)
In-Reply-To: <20230628084246.778302-8-fberat@redhat.com>
On 2023-06-28 04:42, Frédéric Bérat wrote:
> The __REDIRECT* macros are creating aliases which may lead to unwanted
> PLT entries when fortification is enabled.
> To prevent these entries, the REDIRECT alias should be set to point to the
> existing __GI_* aliases.
> This is done transparently by creating a __REDIRECT_FORTIFY* version of
> these macros, that can be overwritten internally when necessary.
> ---
LGTM.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
> include/sys/cdefs.h | 14 ++++++++++++++
> misc/sys/cdefs.h | 8 ++++++++
> 2 files changed, 22 insertions(+)
>
> diff --git a/include/sys/cdefs.h b/include/sys/cdefs.h
> index 56adb231aa..b84ad34a70 100644
> --- a/include/sys/cdefs.h
> +++ b/include/sys/cdefs.h
> @@ -40,6 +40,20 @@ rtld_hidden_proto (__chk_fail)
>
> #endif
>
> +#if defined SHARED
> +#if IS_IN (libc) && __USE_FORTIFY_LEVEL > 0 && defined __fortify_function
> +
> +#undef __REDIRECT_FORTIFY
> +#define __REDIRECT_FORTIFY(name, proto, alias) \
> + __REDIRECT(name, proto, __GI_##alias)
> +
> +#undef __REDIRECT_FORTIFY_NTH
> +#define __REDIRECT_FORTIFY_NTH(name, proto, alias) \
> + __REDIRECT_NTH(name, proto, __GI_##alias)
> +
> +#endif
> +#endif /* defined SHARED */
> +
> #endif /* !defined _ISOMAC */
>
> #endif
> diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
> index 393d9091d9..90c21e2703 100644
> --- a/misc/sys/cdefs.h
> +++ b/misc/sys/cdefs.h
> @@ -268,6 +268,14 @@
> # define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname)
> # define __ASMNAME2(prefix, cname) __STRING (prefix) cname
>
> +#ifndef __REDIRECT_FORTIFY
> +#define __REDIRECT_FORTIFY __REDIRECT
> +#endif
> +
> +#ifndef __REDIRECT_FORTIFY_NTH
> +#define __REDIRECT_FORTIFY_NTH __REDIRECT_NTH
> +#endif
> +
> /*
> #elif __SOME_OTHER_COMPILER__
>
next prev parent reply other threads:[~2023-06-30 15:13 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-28 8:42 [PATCH v3 00/16] Allow glibc to be built with _FORTIFY_SOURCE Frédéric Bérat
2023-06-28 8:42 ` [PATCH v3 01/16] " Frédéric Bérat
2023-06-28 14:48 ` Joseph Myers
2023-06-28 8:42 ` [PATCH v3 02/16] Exclude routines from fortification Frédéric Bérat
2023-06-30 14:55 ` Siddhesh Poyarekar
2023-07-03 15:16 ` Frederic Berat
2023-07-04 16:04 ` Siddhesh Poyarekar
2023-06-28 8:42 ` [PATCH v3 03/16] sysdeps: Ensure ieee128*_chk routines to be properly named Frédéric Bérat
2023-06-30 14:58 ` Siddhesh Poyarekar
2023-06-30 15:55 ` Paul E Murphy
2023-06-30 15:57 ` Frederic Berat
2023-06-28 8:42 ` [PATCH v3 04/16] string: Ensure *_chk routines have their hidden builtin definition available Frédéric Bérat
2023-06-30 15:06 ` Siddhesh Poyarekar
2023-06-28 8:42 ` [PATCH v3 05/16] stdio: " Frédéric Bérat
2023-06-30 15:09 ` Siddhesh Poyarekar
2023-06-28 8:42 ` [PATCH v3 06/16] asprintf_chk: Ensure compatibility for both s390x and ppc64le Frédéric Bérat
2023-06-30 15:11 ` Siddhesh Poyarekar
2023-06-30 16:08 ` Rajalakshmi Srinivasaraghavan
2023-06-30 17:51 ` Paul E Murphy
2023-07-03 5:35 ` Frederic Berat
2023-06-28 8:42 ` [PATCH v3 07/16] misc/sys/cdefs.h: Create FORTIFY redirects for internal calls Frédéric Bérat
2023-06-30 15:13 ` Siddhesh Poyarekar [this message]
2023-06-28 8:42 ` [PATCH v3 08/16] wchar: Avoid PLT entries with _FORTIFY_SOURCE Frédéric Bérat
2023-06-30 15:17 ` Siddhesh Poyarekar
2023-06-30 15:26 ` Frederic Berat
2023-06-28 8:42 ` [PATCH v3 09/16] posix/bits/unistd.h: Clearly separate declaration from definitions Frédéric Bérat
2023-06-30 15:19 ` Siddhesh Poyarekar
2023-06-28 8:42 ` [PATCH v3 10/16] unistd: Avoid PLT entries with _FORTIFY_SOURCE Frédéric Bérat
2023-06-30 15:25 ` Siddhesh Poyarekar
2023-06-28 8:42 ` [PATCH v3 11/16] misc/bits/select2.h: Clearly separate declaration from definitions Frédéric Bérat
2023-06-30 15:26 ` Siddhesh Poyarekar
2023-06-28 8:42 ` [PATCH v3 12/16] misc/bits/syslog.h: Clearly separate declaration from definition Frédéric Bérat
2023-06-30 15:28 ` Siddhesh Poyarekar
2023-06-28 8:42 ` [PATCH v3 13/16] libio/bits/stdio2.h: Clearly separate declaration from definitions Frédéric Bérat
2023-06-30 15:29 ` Siddhesh Poyarekar
2023-06-28 8:42 ` [PATCH v3 14/16] libio/bits/stdio2-decl.h: Avoid PLT entries with _FORTIFY_SOURCE Frédéric Bérat
2023-06-30 15:30 ` Siddhesh Poyarekar
2023-06-30 15:38 ` Frederic Berat
2023-06-30 15:48 ` Siddhesh Poyarekar
2023-06-30 17:08 ` Siddhesh Poyarekar
2023-06-28 8:42 ` [PATCH v3 15/16] sysdeps/ieee754/ldbl-128ibm-compat: Fix warn unused result Frédéric Bérat
2023-06-30 15:33 ` Siddhesh Poyarekar
2023-06-28 8:42 ` [PATCH v3 16/16] Add --enable-fortify-source option Frédéric Bérat
2023-06-30 13:51 ` Siddhesh Poyarekar
2023-07-03 8:50 ` Andreas Schwab
2023-07-03 12:51 ` Adhemerval Zanella Netto
2023-07-04 12:40 ` Frederic Berat
2023-07-04 15:59 ` Siddhesh Poyarekar
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=ac95d238-f0d4-b978-409b-42af63d96007@gotplt.org \
--to=siddhesh@gotplt.org \
--cc=fberat@redhat.com \
--cc=libc-alpha@sourceware.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).