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Mark Johnston 2783335cae blist: Correct the node count computed in blist_create() 
Commit bb4a27f927 added the ability to allocate a span of blocks
crossing a meta node boundary.  To ensure that blst_next_leaf_alloc()
does not walk past the end of the tree, an extra all-zero meta node
needs to be present at the end of the allocation, and
blst_next_leaf_alloc() is implemented such that the presence of this
node terminates the search.

blist_create() computes the number of nodes required.  It had two
problems:
1. When the size of the blist is a power of BLIST_RADIX, we would
   unnecessarily allocate an extra level in the tree.
2. When the size of the blist is a multiple of BLIST_RADIX, we would
   fail to allocate a terminator node.  In this case,
   blst_next_leaf_alloc() could scan beyond the bounds of the
   allocation.  This was found using KASAN.

Modify blist_create() to handle these cases correctly.

Reported by:	pho
Reviewed by:	dougm
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D31158
2021-07-13 17:47:27 -04:00
.cirrus-ci Cirrus-CI: retry pkg installation on failure 2021-06-02 22:41:20 -04:00
.github [skip ci] volunteer to maintain POSIX AIO 2021-05-30 17:21:12 -06:00
bin pkgbase: Put chio in utilities 2021-06-19 17:49:44 +02:00
cddl zfs: attach zpool_influxdb to build 2021-07-07 20:15:12 +02:00
contrib tcpdump: decode packets on pfsync interfaces 2021-07-13 13:29:52 +02:00
crypto kerberos.8: Replace dead link 2021-05-16 01:37:09 -04:00
etc zfs: attach zpool_influxdb to build 2021-07-07 20:15:12 +02:00
gnu dialog: fix macro redefinition 2021-03-01 16:01:44 +01:00
include Change strmode argument type to mode_t 2021-06-29 17:38:45 -06:00
kerberos5 kerberos5: fix the WITH_OPENLDAP build 2021-01-30 00:07:50 -06:00
lib pmc(3): mandoc clean ups 2021-07-12 06:28:03 +02:00
libexec devmatch: don't announce autoloading so much 2021-07-08 15:22:22 -06:00
release release: Remove C-like string comparison operator 2021-06-30 11:13:51 -06:00
rescue Fix building rescue/rescue when sanitizers are enabled 2021-07-06 12:18:30 +01:00
sbin Fix bsd.subdir.mk-related issues after 0a0f748641 2021-07-12 20:54:01 +01:00
secure secure/caroot, certctl: Rename secure/caroot/blacklisted 2021-06-18 13:38:07 +01:00
share igc(4): Correct the man page section 2021-07-13 15:14:24 +02:00
stand Fix pmbr issues > 2TB 2021-07-13 15:40:44 -06:00
sys blist: Correct the node count computed in blist_create() 2021-07-13 17:47:27 -04:00
targets Remove svnlite. 2021-06-11 14:56:41 -07:00
tests Skip netgraph tests when WITHOUT_NETGRAPH is set 2021-07-06 09:45:34 -04:00
tools nanobsd: enhance fill_pkg.sh 2021-07-11 09:05:16 -06:00
usr.bin grep: fix combination of quite and count flag 2021-07-09 14:09:14 +02:00
usr.sbin Fix bsd.subdir.mk-related issues after 0a0f748641 2021-07-12 20:54:01 +01:00
.arcconfig Remove history.immutable from .arcconfig 2021-04-13 12:36:25 +01:00
.arclint
.cirrus.yml CI: use amd64 EDK II firmware included with QEMU 2021-06-26 14:22:48 -04:00
.clang-format
.gitattributes
.gitignore gitignore: Add .clangd and .ccls-cache 2021-06-04 16:56:08 +08:00
COPYRIGHT
LOCKS
MAINTAINERS [skip ci] volunteer to maintain POSIX AIO 2021-05-30 17:21:12 -06:00
Makefile Remove 'make update'. 2021-06-11 14:56:28 -07:00
Makefile.inc1 Remove svnlite. 2021-06-11 14:56:41 -07:00
Makefile.libcompat libpmc: always generate libpmc_events.c 2021-05-31 17:39:05 -03:00
Makefile.sys.inc
ObsoleteFiles.inc ObsoleteFiles.inc: Remove manpages from OLD_FILES 2021-07-07 20:09:02 +02:00
README.md Whitespace cleanup 2021-03-12 19:57:58 +08:00
RELNOTES nfscl: Add entries to UPDATING and RELNOTES for commit a145cf3f73 2021-06-24 19:10:36 -07:00
UPDATING UPDATING: fix typo 2021-07-08 23:42:15 -06:00

README.md

FreeBSD Source:

This is the top level of the FreeBSD source directory.

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), FreeBSD handbook on building userland, and Handbook for kernels for more information, including setting make(1) variables.

Source Roadmap:

Directory Description
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 and gnu/COPYING.LIB 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 FreeBSD Handbook.