Displaying the mode as part of the seectx takes up unnecessary memory,
makes it so we can't use refcounted secctx so we need to alloc/free on
every conversion from secid to secctx and introduces a space that
could be potentially mishandled by tooling.
Eg. In an audit record we get
subj_type=firefix (enforce)
Having the mode reported is not necessary, and might even be confusing
eg. when writing an audit rule to match the above record field you
would use
-F subj_type=firefox
ie. the mode is not included. AppArmor provides ways to find the mode
without reporting as part of the secctx. So disable this by default
before its use is wide spread and we can't. For now we add a sysctl
to control the behavior as we can't guarantee no one is using this.
Acked-by: Andrea Righi <andrea.righi@canonical.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
XArrays are a better match than IDR for how AppArmor is mapping
secids. Specifically AppArmor is trying to keep the allocation
dense. XArrays also have the advantage of avoiding the complexity IDRs
preallocation.
In addition this avoids/fixes a lockdep issue raised in the LKML thread
"Linux 5.18-rc4"
where there is a report of an interaction between apparmor and IPC,
this warning may have been spurious as the reported issue is in a
per-cpu local lock taken by the IDR. With the one side in the IPC id
allocation and the other in AppArmor's secid allocation.
Description by John Johansen <john.johansen@canonical.com>
Message-Id: <226cee6a-6ca1-b603-db08-8500cd8f77b7@gnuweeb.org>
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: John Johansen <john.johansen@canonical.com>
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 version 2 of the license
extracted by the scancode license scanner the SPDX license identifier
GPL-2.0-only
has been chosen to replace the boilerplate/reference in 315 file(s).
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Armijn Hemel <armijn@tjaldur.nl>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190531190115.503150771@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
- replace spin_is_locked() with lockdep
- add base support for secmark labeling and matching
+ Cleanups
- clean an indentation issue, remove extraneous space
- remove no-op permission check in policy_unpack
- fix checkpatch missing spaces error in Parse secmark policy
- fix network performance issue in aa_label_sk_perm
+ Bug fixes
- add #ifdef checks for secmark filtering
- fix an error code in __aa_create_ns()
- don't try to replace stale label in ptrace checks
- fix failure to audit context info in build_change_hat
- check buffer bounds when mapping permissions mask
- fully initialize aa_perms struct when answering userspace query
- fix uninitialized value in aa_split_fqname
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Merge tag 'apparmor-pr-2018-11-01' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor
Pull apparmor updates from John Johansen:
"Features/Improvements:
- replace spin_is_locked() with lockdep
- add base support for secmark labeling and matching
Cleanups:
- clean an indentation issue, remove extraneous space
- remove no-op permission check in policy_unpack
- fix checkpatch missing spaces error in Parse secmark policy
- fix network performance issue in aa_label_sk_perm
Bug fixes:
- add #ifdef checks for secmark filtering
- fix an error code in __aa_create_ns()
- don't try to replace stale label in ptrace checks
- fix failure to audit context info in build_change_hat
- check buffer bounds when mapping permissions mask
- fully initialize aa_perms struct when answering userspace query
- fix uninitialized value in aa_split_fqname"
* tag 'apparmor-pr-2018-11-01' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor:
apparmor: clean an indentation issue, remove extraneous space
apparmor: fix checkpatch error in Parse secmark policy
apparmor: add #ifdef checks for secmark filtering
apparmor: Fix uninitialized value in aa_split_fqname
apparmor: don't try to replace stale label in ptraceme check
apparmor: Replace spin_is_locked() with lockdep
apparmor: Allow filtering based on secmark policy
apparmor: Parse secmark policy
apparmor: Add a wildcard secid
apparmor: don't try to replace stale label in ptrace access check
apparmor: Fix network performance issue in aa_label_sk_perm
Reserve a secid value that we can use as a wildcard, allowing us to
define policy that's expected to match against all secids.
Signed-off-by: Matthew Garrett <mjg59@google.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
The IDR conversion did not handle an error case for when allocating a
mapping fails, and it did not ensure that mappings did not allocate or
use a 0 value, which is used as an invalid secid. Which is used when a
mapping fails.
Fixes: 3ae7eb49a2be ("apparmor: Use an IDR to allocate apparmor secids")
Signed-off-by: John Johansen <john.johansen@canonical.com>
Replace the custom usage of the radix tree to store a list of free IDs
with the IDR.
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Use a radix tree to provide a map between the secid and the label,
and along with it a basic ability to provide secctx conversion.
Shared/cached secctx will be added later.
Signed-off-by: John Johansen <john.johansen@canonical.com>
