freebsd kernel with SKQ
ed8d80c2de
The problem is caused when a directory block is compacted. When this occurs, softdep_change_directoryentry_offset() is called to relocate each directory entry and adjust its matching diradd structure, if any, to match the new location of the entry. The bug is that while softdep_change_directoryentry_offset() correctly adjusts the offsets of the diradd structures on the pd_diraddhd[] lists (which are not yet ready to be committed to disk), it fails to adjust the offsets of the diradd structures on the pd_pendinghd list (which are ready to be committed to disk). This causes the dependency structures to be inconsistent with the buf contents. Now, if the compaction has moved a directory entry to the same offset as one of the diradd structures on the pd_pendinghd list *and* a syscall is done that tries to remove this directory entry before this directory block has been written to disk (which would empty pd_pendinghd), a sanity check in newdirrem() will call panic() when it notices that the inode number in the entry that it is to be removed doesn't match the inode number in the diradd structure with that offset of that entry. Reviewed by: Kirk McKusick <mckusick@McKusick.COM> Submitted by: Don Lewis <Don.Lewis@tsc.tdk.com> |
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| bin | ||
| contrib | ||
| crypto | ||
| etc | ||
| games | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| kerberosIV | ||
| lib | ||
| libexec | ||
| lkm | ||
| release | ||
| sbin | ||
| secure | ||
| share | ||
| sys | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| COPYRIGHT | ||
| Makefile | ||
| Makefile.inc0 | ||
| Makefile.inc1 | ||
| Makefile.upgrade | ||
| README | ||
This is the top level of the FreeBSD source directory. This file was last revised on: $Id: README,v 1.12 1998/06/30 08:08:05 jkh Exp $ 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, the most commonly used one being ``world'', which rebuilds and installs everything in the FreeBSD system from the source tree except the kernel and the contents of /etc. Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags. Building a kernel with config(8) is a somewhat more involved process, documentation for which can be found at: http://www.freebsd.org/handbook/kernelconfig.html And in the config(8) man page. The sample kernel configuration files reside in the sys/i386/conf sub-directory (assuming that you've installed the kernel sources), the file named GENERIC being the one used to build your initial installation kernel. The file LINT contains entries for all possible devices, not just those commonly used, and is meant more as a general reference than an actual kernel configuration file (a kernel built from it wouldn't even run). Source Roadmap: --------------- bin System/User commands. contrib Packages contributed by 3rd parties. crypto Export controlled stuff (see crypto/README). etc Template files for /etc games Amusements. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. kerberosIV Kerberos package. lib System libraries. libexec System daemons. lkm Loadable Kernel Modules. release Release building Makefile & associated tools. sbin System commands. secure DES and DES-related utilities - NOT FOR EXPORT! share Shared resources. sys Kernel sources. 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: http://www.freebsd.org/handbook/synching.html