kernel/linux.git/include/linux/audit.h, branch v5.8.18

audit: Replace zero-length array with flexible-array

2020-05-08T02:49:28+00:00

The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertently introduced[3] to the codebase from now on. Also, notice that, dynamic memory allocations won't be affected by this change: "Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero."[1] sizeof(flexible-array-member) triggers a warning because flexible array members have incomplete type[1]. There are some instances of code in which the sizeof operator is being incorrectly/erroneously applied to zero-length arrays and the result is zero. Such instances may be hiding some bugs. So, this work (flexible-array member conversions) will also help to get completely rid of those sorts of issues. This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour") Signed-off-by: Gustavo A. R. Silva Reviewed-by: Richard Guy Briggs Signed-off-by: Paul Moore

netfilter: add audit table unregister actions

2020-04-28T22:11:36+00:00

Audit the action of unregistering ebtables and x_tables. See: https://github.com/linux-audit/audit-kernel/issues/44 Signed-off-by: Richard Guy Briggs Signed-off-by: Paul Moore

audit: tidy and extend netfilter_cfg x_tables

2020-04-28T21:52:42+00:00

NETFILTER_CFG record generation was inconsistent for x_tables and ebtables configuration changes. The call was needlessly messy and there were supporting records missing at times while they were produced when not requested. Simplify the logging call into a new audit_log_nfcfg call. Honour the audit_enabled setting while more consistently recording information including supporting records by tidying up dummy checks. Add an op= field that indicates the operation being performed (register or replace). Here is the enhanced sample record: type=NETFILTER_CFG msg=audit(1580905834.919:82970): table=filter family=2 entries=83 op=replace Generate audit NETFILTER_CFG records on ebtables table registration. Previously this was being done for x_tables registration and replacement operations and ebtables table replacement only. See: https://github.com/linux-audit/audit-kernel/issues/25 See: https://github.com/linux-audit/audit-kernel/issues/35 See: https://github.com/linux-audit/audit-kernel/issues/43 Signed-off-by: Richard Guy Briggs Signed-off-by: Paul Moore

audit: Report suspicious O_CREAT usage

2019-10-03T17:59:29+00:00

This renames the very specific audit_log_link_denied() to audit_log_path_denied() and adds the AUDIT_* type as an argument. This allows for the creation of the new AUDIT_ANOM_CREAT that can be used to report the fifo/regular file creation restrictions that were introduced in commit 30aba6656f61 ("namei: allow restricted O_CREAT of FIFOs and regular files"). Signed-off-by: Kees Cook Signed-off-by: Paul Moore

kill LOOKUP_NO_EVAL, don't bother including namei.h from audit.h

2019-08-31T01:29:32+00:00

The former has no users left; the latter was only to get LOOKUP_... values to remapper in audit_inode() and that's an ex-parrot now. All places that use symbols from namei.h include it either directly or (in a few cases) via a local header, like fs/autofs/autofs_i.h Signed-off-by: Al Viro

audit_inode(): switch to passing AUDIT_INODE_...

2019-07-21T22:24:46+00:00

don't bother with remapping LOOKUP_... values - all callers pass constants and we can just as well pass the right ones from the very beginning. Signed-off-by: Al Viro

Merge tag 'audit-pr-20190702' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit

2019-07-09T01:55:42+00:00

Pull audit updates from Paul Moore: "This pull request is a bit early, but with some vacation time coming up I wanted to send this out now just in case the remote Internet Gods decide not to smile on me once the merge window opens. The patchset for v5.3 is pretty minor this time, the highlights include: - When the audit daemon is sent a signal, ensure we deliver information about the sender even when syscall auditing is not enabled/supported. - Add the ability to filter audit records based on network address family. - Tighten the audit field filtering restrictions on string based fields. - Cleanup the audit field filtering verification code. - Remove a few BUG() calls from the audit code" * tag 'audit-pr-20190702' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit: audit: remove the BUG() calls in the audit rule comparison functions audit: enforce op for string fields audit: add saddr_fam filter field audit: re-structure audit field valid checks audit: deliver signal_info regarless of syscall

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156

2019-05-30T18:26:35+00:00

Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Reviewed-by: Richard Fontana Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman

audit: deliver signal_info regarless of syscall

2019-05-22T02:18:25+00:00

When a process signals the audit daemon (shutdown, rotate, resume, reconfig) but syscall auditing is not enabled, we still want to know the identity of the process sending the signal to the audit daemon. Move audit_signal_info() out of syscall auditing to general auditing but create a new function audit_signal_info_syscall() to take care of the syscall dependent parts for when syscall auditing is enabled. Please see the github kernel audit issue https://github.com/linux-audit/audit-kernel/issues/111 Signed-off-by: Richard Guy Briggs Signed-off-by: Paul Moore

ntp: Audit NTP parameters adjustment

2019-04-15T22:14:01+00:00

Emit an audit record every time selected NTP parameters are modified from userspace (via adjtimex(2) or clock_adjtime(2)). These parameters may be used to indirectly change system clock, and thus their modifications should be audited. Such events will now generate records of type AUDIT_TIME_ADJNTPVAL containing the following fields: - op -- which value was adjusted: - offset -- corresponding to the time_offset variable - freq -- corresponding to the time_freq variable - status -- corresponding to the time_status variable - adjust -- corresponding to the time_adjust variable - tick -- corresponding to the tick_usec variable - tai -- corresponding to the timekeeping's TAI offset - old -- the old value - new -- the new value Example records: type=TIME_ADJNTPVAL msg=audit(1530616044.507:7): op=status old=64 new=8256 type=TIME_ADJNTPVAL msg=audit(1530616044.511:11): op=freq old=0 new=49180377088000 The records of this type will be associated with the corresponding syscall records. An overview of parameter changes that can be done via do_adjtimex() (based on information from Miroslav Lichvar) and whether they are audited: __timekeeping_set_tai_offset() -- sets the offset from the International Atomic Time (AUDITED) NTP variables: time_offset -- can adjust the clock by up to 0.5 seconds per call and also speed it up or slow down by up to about 0.05% (43 seconds per day) (AUDITED) time_freq -- can speed up or slow down by up to about 0.05% (AUDITED) time_status -- can insert/delete leap seconds and it also enables/ disables synchronization of the hardware real-time clock (AUDITED) time_maxerror, time_esterror -- change error estimates used to inform userspace applications (NOT AUDITED) time_constant -- controls the speed of the clock adjustments that are made when time_offset is set (NOT AUDITED) time_adjust -- can temporarily speed up or slow down the clock by up to 0.05% (AUDITED) tick_usec -- a more extreme version of time_freq; can speed up or slow down the clock by up to 10% (AUDITED) Signed-off-by: Ondrej Mosnacek Reviewed-by: Richard Guy Briggs Reviewed-by: Thomas Gleixner Signed-off-by: Paul Moore