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Mark Johnston 3d69515cfe arc4random: Avoid KMSAN false positives from pre-seeding results
If code calls arc4random(), and our RNG is not yet seeded and
random_bypass_before_seeding is true, we'll compute a key using the
SHA256 hash of some hopefully hard-to-predict data, including the
contents of an uninitialized stack buffer (which is also the output
buffer).

When KMSAN is enabled, this use of uninitialized state propagtes through
to the arc4random() output, resulting in false positives.  To address
this, lie to KMSAN and explicitly mark the buffer as initialized.

Reviewed by:	cem (previous version)
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D31510
2021-08-13 09:58:42 -04:00
.cirrus-ci Cirrus-CI: add some timing info on pkg install failure 2021-08-04 15:02:00 -04:00
.github [skip ci] fix syntax in CODEOWNERS 2021-07-22 10:58:54 -06:00
bin df: remove the unused fstype var 2021-07-20 19:00:50 +02:00
cddl zfs: attach zpool_influxdb to build 2021-07-07 20:15:12 +02:00
contrib usr.bin/ghä-bc, contrib/bc: update to version 5.0.0 2021-08-13 11:28:06 +02:00
crypto kerberos.8: Replace dead link 2021-05-16 01:37:09 -04:00
etc mtree: remove a leftover '..' in BSD.usr.dist making it inconsistent 2021-08-03 17:06:31 +02:00
gnu dialog: fix macro redefinition 2021-03-01 16:01:44 +01:00
include Add _Fork() 2021-08-03 21:19:32 +03:00
kerberos5 kerberos5: fix the WITH_OPENLDAP build 2021-01-30 00:07:50 -06:00
lib clang: Fix inverted condition in llvm.build.mk 2021-08-12 23:53:30 +01:00
libexec rtld: Round down relro_size 2021-08-13 12:58:53 +03:00
release release: allow VM_EXTRA_PACKAGES to be specified in the environment 2021-08-09 10:31:51 -06:00
rescue Fix building rescue/rescue when sanitizers are enabled 2021-07-06 12:18:30 +01:00
sbin dumpon: fix build on some architectures 2021-08-11 21:27:24 -05:00
secure secure/caroot, certctl: Rename secure/caroot/blacklisted 2021-06-18 13:38:07 +01:00
share bsd.compiler.mk: Fix cross-building from non-FreeBSD 2021-08-12 23:45:09 +01:00
stand loader: fix multiboot loading on UEFI 2021-08-12 09:18:33 +02:00
sys arc4random: Avoid KMSAN false positives from pre-seeding results 2021-08-13 09:58:42 -04:00
targets Prefer MK_SSP=no to SSP_CFLAGS= 2021-08-04 15:23:22 -03:00
tests uipc_shm: Implements fspacectl(2) support 2021-08-12 23:04:18 +08:00
tools tools/build/cross-build: Fix building libllvmminimal on Linux 2021-08-12 23:50:48 +01:00
usr.bin usr.bin/ghä-bc, contrib/bc: update to version 5.0.0 2021-08-13 11:28:06 +02:00
usr.sbin nfs tls: Update for SSL_OP_ENABLE_KTLS. 2021-08-10 14:18:43 -07:00
.arcconfig Remove history.immutable from .arcconfig 2021-04-13 12:36:25 +01:00
.arclint arc lint: ignore /tests/ in chmod 2017-12-19 03:38:06 +00:00
.cirrus.yml Revert "Cirrus-CI: Temporarily skip package build + test" 2021-07-27 16:28:47 -04:00
.clang-format clang-format: Avoid breaking after the opening paren of function definitions 2020-10-28 11:54:00 +00:00
.gitattributes Add a basic clang-format configuration file 2019-06-07 15:23:52 +00:00
.gitignore gitignore: Add .clangd and .ccls-cache 2021-06-04 16:56:08 +08:00
COPYRIGHT copyrights: Happy New Year 2021 2020-12-31 10:29:44 -05:00
LOCKS LOCKS: update current locks 2018-06-09 03:08:04 +00:00
MAINTAINERS [skip ci] volunteer to maintain POSIX AIO 2021-05-30 17:21:12 -06:00
Makefile Revert "Fix native-xtools build" 2021-08-03 10:00:28 -07:00
Makefile.inc1 Makefile.inc1: Avoid hanging if pkg is not installed 2021-08-07 23:13:40 -04:00
Makefile.libcompat Prefer MK_SSP=no to SSP_CFLAGS= 2021-08-04 15:23:22 -03:00
Makefile.sys.inc AUTO_OBJ: For all top-level targets enforce using an OBJDIR. 2017-12-05 21:29:47 +00:00
ObsoleteFiles.inc pmc(3): remove Pentium-related man pages and references 2021-08-10 17:19:58 -03:00
README.md Whitespace cleanup 2021-03-12 19:57:58 +08:00
RELNOTES RELNOTES: Add entries for KASAN and KMSAN 2021-08-11 13:08:36 -04:00
UPDATING UPDATING: Add an entry for commit 3ad1e1c1ce 2021-08-11 18:58:00 -07:00

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