lsm: replace context+len with lsm_context

Replace the (secctx,seclen) pointer pair with a single
lsm_context pointer to allow return of the LSM identifier
along with the context and context length.

lsm: replace context+len with lsm_context

Replace the (secctx,seclen) pointer pair with a single
lsm_context pointer to allow return of the LSM identifier
along with the context and context length. This allows
security_release_secctx() to know how to release the
context. Callers have been modified to use or save the
returned data from the new structure.

security_secid_to_secctx() and security_lsmproc_to_secctx()
will now return the length value on success instead of 0.

Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: Todd Kjos <[email protected]>
Signed-off-by: Casey Schaufler <[email protected]>
[PM: subject tweak, kdoc fix, signedness fix from Dan Carpenter]
Signed-off-by: Paul Moore <[email protected]>

show more ...

lsm: ensure the correct LSM context releaser

Add a new lsm_context data structure to hold all the information about a
"security context", including the string, its size and which LSM allocated
the s

lsm: ensure the correct LSM context releaser

Add a new lsm_context data structure to hold all the information about a
"security context", including the string, its size and which LSM allocated
the string. The allocation information is necessary because LSMs have
different policies regarding the lifecycle of these strings. SELinux
allocates and destroys them on each use, whereas Smack provides a pointer
to an entry in a list that never goes away.

Update security_release_secctx() to use the lsm_context instead of a
(char *, len) pair. Change its callers to do likewise. The LSMs
supporting this hook have had comments added to remind the developer
that there is more work to be done.

The BPF security module provides all LSM hooks. While there has yet to
be a known instance of a BPF configuration that uses security contexts,
the possibility is real. In the existing implementation there is
potential for multiple frees in that case.

Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
To: Pablo Neira Ayuso <[email protected]>
Cc: [email protected]
Cc: Todd Kjos <[email protected]>
Signed-off-by: Casey Schaufler <[email protected]>
[PM: subject tweak]
Signed-off-by: Paul Moore <[email protected]>

show more ...

apparmor: Remove deadcode

aa_label_audit, aa_label_find, aa_label_seq_print and aa_update_label_name
were added by commit
f1bd904175e8 ("apparmor: add the base fns() for domain labels")
but never us

apparmor: Remove deadcode

aa_label_audit, aa_label_find, aa_label_seq_print and aa_update_label_name
were added by commit
f1bd904175e8 ("apparmor: add the base fns() for domain labels")
but never used.

aa_profile_label_perm was added by commit
637f688dc3dc ("apparmor: switch from profiles to using labels on contexts")
but never used.

aa_secid_update was added by commit
c092921219d2 ("apparmor: add support for mapping secids and using secctxes")
but never used.

aa_split_fqname has been unused since commit
3664268f19ea ("apparmor: add namespace lookup fns()")

aa_lookup_profile has been unused since commit
93c98a484c49 ("apparmor: move exec domain mediation to using labels")

aa_audit_perms_cb was only used by aa_profile_label_perm (see above).

All of these commits are from around 2017.

Remove them.

Signed-off-by: Dr. David Alan Gilbert <[email protected]>
Signed-off-by: John Johansen <[email protected]>

show more ...

lsm: add lsmprop_to_secctx hook

Add a new hook security_lsmprop_to_secctx() and its LSM specific
implementations. The LSM specific code will use the lsm_prop element
allocated for that module. This

lsm: add lsmprop_to_secctx hook

Add a new hook security_lsmprop_to_secctx() and its LSM specific
implementations. The LSM specific code will use the lsm_prop element
allocated for that module. This allows for the possibility that more
than one module may be called upon to translate a secid to a string,
as can occur in the audit code.

Signed-off-by: Casey Schaufler <[email protected]>
[PM: subject line tweak]
Signed-off-by: Paul Moore <[email protected]>

show more ...

apparmor: disable showing the mode as part of a secid to secctx

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/

apparmor: disable showing the mode as part of a secid to secctx

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 <[email protected]>
Signed-off-by: John Johansen <[email protected]>

show more ...

apparmor: Convert secid mapping to XArrays instead of IDR

XArrays are a better match than IDR for how AppArmor is mapping
secids. Specifically AppArmor is trying to keep the allocation
dense. XArra

apparmor: Convert secid mapping to XArrays instead of IDR

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 <[email protected]>

Message-Id: <[email protected]>
Signed-off-by: Matthew Wilcox <[email protected]>
Signed-off-by: John Johansen <[email protected]>

show more ...

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441

Based on 1 normalized pattern(s):

this program is free software you can redistribute it and or modify
it under the terms of th

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441

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 <[email protected]>
Reviewed-by: Allison Randal <[email protected]>
Reviewed-by: Armijn Hemel <[email protected]>
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

show more ...

apparmor: Add a wildcard secid

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@g

apparmor: Add a wildcard secid

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 <[email protected]>
Signed-off-by: John Johansen <[email protected]>

show more ...

apparmor: fixup secid map conversion to using IDR

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

apparmor: fixup secid map conversion to using IDR

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 <[email protected]>

show more ...

apparmor: add support for mapping secids and using secctxes

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

apparmor: add support for mapping secids and using secctxes

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 <[email protected]>

show more ...

apparmor: rename sid to secid

Move to common terminology with other LSMs and kernel infrastucture

Signed-off-by: John Johansen <[email protected]>