From: "H.J. Lu" <hjl.tools@gmail.com>
To: gnu-gabi@sourceware.org,
IA32 System V Application Binary Interface
<ia32-abi@googlegroups.com>,
"x86-64-abi@googlegroups.com" <x86-64-abi@googlegroups.com>
Subject: RFC: Update x86 psABI to support shadow stac
Date: Sun, 01 Jan 2017 00:00:00 -0000 [thread overview]
Message-ID: <CAMe9rOq9-LXXzNQy8ov67rJM6rfQP=7+sWnK_RdHbe2OTiULtw@mail.gmail.com> (raw)
Any comments?
--
H.J.
---
To support shadow stack (SHSTK) in Intel Control-flow Enforcement
Technology (CET) instructions:
https://software.intel.com/sites/default/files/managed/4d/2a/control-flow-enforc
ement-technology-preview.pdf
following changes to x86 psABI are required.
To program properties, add
#define GNU_PROPERTY_X86_FEATURE_1_SHSTK (1U << 1)
to the GNU_PROPERTY_X86_FEATURE_1_AND property to indicate that all
executable sections are compatible with SHSTK where return address
popped from shadow stack always matches return address popped from
normal stack.
GNU_PROPERTY_X86_FEATURE_1_SHSTK is set on output only if it is set on
all relocatable inputs, which means that the C library must be compiled
with SHSTK-enabled compiler.
Load-time processing
On a SHSTK capable processor, the following steps should be taken:
1. When loading an executable, if GNU_PROPERTY_X86_FEATURE_1_SHSTK is
set on the executable as well as all shared objects loaded via the
DT_NEEDED tag, enable SHSTK.
2. After SHSTK is enabled, it is an error to load a shared object
without GNU_PROPERTY_X86_FEATURE_1_SHSTK.
gnu-6:pts/8[8]> cat shstk.txt /export/gnu/import/git/properties
Update x86 psABI to support shadow stack
To support shadow stack (SHSTK) in Intel Control-flow Enforcement
Technology (CET) instructions:
https://software.intel.com/sites/default/files/managed/4d/2a/control-flow-enforcement-technology-preview.pdf
following changes to x86 psABI are required.
To program properties, add
#define GNU_PROPERTY_X86_FEATURE_1_SHSTK (1U << 1)
to the GNU_PROPERTY_X86_FEATURE_1_AND property to indicate that all
executable sections are compatible with SHSTK where return address
popped from shadow stack always matches return address popped from
normal stack.
GNU_PROPERTY_X86_FEATURE_1_SHSTK is set on output only if it is set on
all relocatable inputs, which means that the C library must be compiled
with SHSTK-enabled compiler.
Load-time processing
On a SHSTK capable processor, the following steps should be taken:
1. When loading an executable, if GNU_PROPERTY_X86_FEATURE_1_SHSTK is
set on the executable as well as all shared objects loaded via the
DT_NEEDED tag, enable SHSTK.
2. After SHSTK is enabled, it is an error to load a shared object
without GNU_PROPERTY_X86_FEATURE_1_SHSTK.
next reply other threads:[~2017-06-21 15:25 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-01 0:00 H.J. Lu [this message]
2017-01-01 0:00 ` Florian Weimer
2017-01-01 0:00 ` H.J. Lu
2017-01-01 0:00 ` Florian Weimer
2017-01-01 0:00 ` H.J. Lu
2017-01-01 0:00 ` Florian Weimer
2017-01-01 0:00 ` H.J. Lu
2017-01-01 0:00 ` Florian Weimer
2017-01-01 0:00 ` H.J. Lu
2017-01-01 0:00 ` Florian Weimer
2017-01-01 0:00 ` H.J. Lu
2017-01-01 0:00 ` Shanbhogue, Vedvyas
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='CAMe9rOq9-LXXzNQy8ov67rJM6rfQP=7+sWnK_RdHbe2OTiULtw@mail.gmail.com' \
--to=hjl.tools@gmail.com \
--cc=gnu-gabi@sourceware.org \
--cc=ia32-abi@googlegroups.com \
--cc=x86-64-abi@googlegroups.com \
/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).