74aa2d49d6
The PCIOCLISTVPD ioctl on /dev/pci is used to fetch a list of VPD key-value pairs for a specific PCI function. It is used by 'pciconf -l -V'. The list is stored in a userland-supplied buffer as an array of variable-length structures where the key and data length are stored in a fixed-size header followed by the variable-length value as a byte array. To facilitate walking this array in userland, <sys/pciio.h> provides a PVE_NEXT() helper macro to return a pointer to the next array element by reading the the length out of the current header and using it to compute the address of the next header. To simplify the implementation, the ioctl handler was also using PVE_NEXT() when on the user address of the user buffer to compute the user address of the next array element. However, the PVE_NEXT() macro when used with a user address was reading the value's length by indirecting the user pointer. The value was ready after the current record had been copied out to the user buffer, so it appeared to work on architectures where user addresses are directly dereferencable from the kernel (all but powerpc and i386 after the 4:4 split). The recent enablement of SMAP on amd64 caught this violation however. To fix, add a variant of PVE_NEXT() for use in the ioctl handler that takes an explicit value length. Reported by: Jeffrey Pieper @ Intel Reviewed by: kib Approved by: re (gjb) MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D16800 |
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| cddl | ||
| contrib | ||
| crypto | ||
| etc | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| lib | ||
| libexec | ||
| release | ||
| rescue | ||
| sbin | ||
| secure | ||
| share | ||
| stand | ||
| sys | ||
| targets | ||
| tests | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| .arcconfig | ||
| .arclint | ||
| .gitattributes | ||
| .gitignore | ||
| COPYRIGHT | ||
| LOCKS | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| Makefile.libcompat | ||
| Makefile.sys.inc | ||
| ObsoleteFiles.inc | ||
| README | ||
| README.md | ||
| UPDATING | ||
FreeBSD Source:
This is the top level of the FreeBSD source directory. This file
was last revised on:
FreeBSD
FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms. A large community has continually developed it for more than thirty years. Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of the busiest web sites and most pervasive embedded networking and storage devices.
For copyright information, please see the file COPYRIGHT in this directory. Additional copyright information also exists for some sources in this tree - please see the specific source directories for more information.
The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7), config(8), https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html, and https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information, including setting make(1) variables.
Source Roadmap:
bin System/user commands.
cddl Various commands and libraries under the Common Development
and Distribution License.
contrib Packages contributed by 3rd parties.
crypto Cryptography stuff (see crypto/README).
etc Template files for /etc.
gnu Various commands and libraries under the GNU Public License.
Please see gnu/COPYING* for more information.
include System include files.
kerberos5 Kerberos5 (Heimdal) package.
lib System libraries.
libexec System daemons.
release Release building Makefile & associated tools.
rescue Build system for statically linked /rescue utilities.
sbin System commands.
secure Cryptographic libraries and commands.
share Shared resources.
stand Boot loader sources.
sys Kernel sources.
sys/<arch>/conf Kernel configuration files. GENERIC is the configuration
used in release builds. NOTES contains documentation of
all possible entries.
tests Regression tests which can be run by Kyua. See tests/README
for additional information.
tools Utilities for regression testing and miscellaneous tasks.
usr.bin User commands.
usr.sbin System administration commands.
For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see:
https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/current-stable.html