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[binutils-gdb] amd64-mpx: initialize BND register before performing inferior calls.
- From: sergiodj+buildbot at sergiodj dot net
- To: gdb-testers at sourceware dot org
- Date: Tue, 07 Mar 2017 08:27:54 -0500
- Subject: [binutils-gdb] amd64-mpx: initialize BND register before performing inferior calls.
- Authentication-results: sourceware.org; auth=none
*** TEST RESULTS FOR COMMIT 4a612d6f67d605f480ce7eec7fd9ca1cd1087b35 ***
Author: Walfred Tedeschi <walfred.tedeschi@intel.com>
Branch: master
Commit: 4a612d6f67d605f480ce7eec7fd9ca1cd1087b35
amd64-mpx: initialize BND register before performing inferior calls.
This patch initializes the BND registers before executing the inferior
call. BND registers can be in arbitrary values at the moment of the
inferior call. In case the function being called uses as part of the
parameters BND register, e.g. when passing a pointer as parameter, the
current value of the register will be used. This can cause boundary
violations that are not due to a real bug or even desired by the user.
In this sense the best to be done is set the BND registers to allow
access to the whole memory, i.e. initialized state, before pushing the
inferior call.
2017-03-07 Walfred Tedeschi <walfred.tedeschi@intel.com>
gdb/ChangeLog:
* i387-tdep.h (i387_reset_bnd_regs): Add function definition.
* i387-tdep.c (i387_reset_bnd_regs): Add function implementation.
* i386-tdep.c (i386_push_dummy_call): Call i387_reset_bnd_regs.
* amd64-tdep (amd64_push_dummy_call): Call i387_reset_bnd_regs.
gdb/testsuite/ChangeLog:
* i386-mpx-call.c: New file.
* i386-mpx-call.exp: New file.
gdb/doc/ChangeLog:
* Memory Protection Extensions: Add information about inferior
calls.