Pull security subsystem updates from James Morris:
"In this patchset, there are a couple of minor updates, as well as some
reworking of the LSM initialization code from Kees Cook (these prepare
the way for ordered stackable LSMs, but are a valuable cleanup on
their own)"
* 'next-general' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
LSM: Don't ignore initialization failures
LSM: Provide init debugging infrastructure
LSM: Record LSM name in struct lsm_info
LSM: Convert security_initcall() into DEFINE_LSM()
vmlinux.lds.h: Move LSM_TABLE into INIT_DATA
LSM: Convert from initcall to struct lsm_info
LSM: Remove initcall tracing
LSM: Rename .security_initcall section to .lsm_info
vmlinux.lds.h: Avoid copy/paste of security_init section
LSM: Correctly announce start of LSM initialization
security: fix LSM description location
keys: Fix the use of the C++ keyword "private" in uapi/linux/keyctl.h
seccomp: remove unnecessary unlikely()
security: tomoyo: Fix obsolete function
security/capabilities: remove check for -EINVAL
Pull siginfo updates from Eric Biederman:
"I have been slowly sorting out siginfo and this is the culmination of
that work.
The primary result is in several ways the signal infrastructure has
been made less error prone. The code has been updated so that manually
specifying SEND_SIG_FORCED is never necessary. The conversion to the
new siginfo sending functions is now complete, which makes it
difficult to send a signal without filling in the proper siginfo
fields.
At the tail end of the patchset comes the optimization of decreasing
the size of struct siginfo in the kernel from 128 bytes to about 48
bytes on 64bit. The fundamental observation that enables this is by
definition none of the known ways to use struct siginfo uses the extra
bytes.
This comes at the cost of a small user space observable difference.
For the rare case of siginfo being injected into the kernel only what
can be copied into kernel_siginfo is delivered to the destination, the
rest of the bytes are set to 0. For cases where the signal and the
si_code are known this is safe, because we know those bytes are not
used. For cases where the signal and si_code combination is unknown
the bits that won't fit into struct kernel_siginfo are tested to
verify they are zero, and the send fails if they are not.
I made an extensive search through userspace code and I could not find
anything that would break because of the above change. If it turns out
I did break something it will take just the revert of a single change
to restore kernel_siginfo to the same size as userspace siginfo.
Testing did reveal dependencies on preferring the signo passed to
sigqueueinfo over si->signo, so bit the bullet and added the
complexity necessary to handle that case.
Testing also revealed bad things can happen if a negative signal
number is passed into the system calls. Something no sane application
will do but something a malicious program or a fuzzer might do. So I
have fixed the code that performs the bounds checks to ensure negative
signal numbers are handled"
* 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (80 commits)
signal: Guard against negative signal numbers in copy_siginfo_from_user32
signal: Guard against negative signal numbers in copy_siginfo_from_user
signal: In sigqueueinfo prefer sig not si_signo
signal: Use a smaller struct siginfo in the kernel
signal: Distinguish between kernel_siginfo and siginfo
signal: Introduce copy_siginfo_from_user and use it's return value
signal: Remove the need for __ARCH_SI_PREABLE_SIZE and SI_PAD_SIZE
signal: Fail sigqueueinfo if si_signo != sig
signal/sparc: Move EMT_TAGOVF into the generic siginfo.h
signal/unicore32: Use force_sig_fault where appropriate
signal/unicore32: Generate siginfo in ucs32_notify_die
signal/unicore32: Use send_sig_fault where appropriate
signal/arc: Use force_sig_fault where appropriate
signal/arc: Push siginfo generation into unhandled_exception
signal/ia64: Use force_sig_fault where appropriate
signal/ia64: Use the force_sig(SIGSEGV,...) in ia64_rt_sigreturn
signal/ia64: Use the generic force_sigsegv in setup_frame
signal/arm/kvm: Use send_sig_mceerr
signal/arm: Use send_sig_fault where appropriate
signal/arm: Use force_sig_fault where appropriate
...
Instead of using argument-based initializers, switch to defining the
contents of struct lsm_info on a per-LSM basis. This also drops
the final use of the now inaccurate "initcall" naming.
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: James Morris <james.morris@microsoft.com>
Signed-off-by: James Morris <james.morris@microsoft.com>
Linus recently observed that if we did not worry about the padding
member in struct siginfo it is only about 48 bytes, and 48 bytes is
much nicer than 128 bytes for allocating on the stack and copying
around in the kernel.
The obvious thing of only adding the padding when userspace is
including siginfo.h won't work as there are sigframe definitions in
the kernel that embed struct siginfo.
So split siginfo in two; kernel_siginfo and siginfo. Keeping the
traditional name for the userspace definition. While the version that
is used internally to the kernel and ultimately will not be padded to
128 bytes is called kernel_siginfo.
The definition of struct kernel_siginfo I have put in include/signal_types.h
A set of buildtime checks has been added to verify the two structures have
the same field offsets.
To make it easy to verify the change kernel_siginfo retains the same
size as siginfo. The reduction in size comes in a following change.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Pull apparmor updates from John Johansen:
"There is nothing major this time just four bug fixes and a patch to
remove some dead code:
Cleanups:
- remove no-op permission check in policy_unpack
Bug fixes:
- fix an error code in __aa_create_ns()
- 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"
* tag 'apparmor-pr-2018-08-23' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor:
apparmor: remove no-op permission check in policy_unpack
apparmor: fix an error code in __aa_create_ns()
apparmor: Fix failure to audit context info in build_change_hat
apparmor: Fully initialize aa_perms struct when answering userspace query
apparmor: Check buffer bounds when mapping permissions mask
We should return error pointers in this function. Returning NULL
results in a NULL dereference in the caller.
Fixes: 73688d1ed0 ("apparmor: refactor prepare_ns() and make usable from different views")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Cleans up clang warning:
warning: variable 'info' set but not used [-Wunused-but-set-variable]
Fixes: 89dbf1962a ("apparmor: move change_hat mediation to using labels")
Reported-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Fully initialize the aa_perms struct in profile_query_cb() to avoid the
potential of using an uninitialized struct member's value in a response
to a query from userspace.
Detected by CoverityScan CID#1415126 ("Uninitialized scalar variable")
Fixes: 4f3b3f2d79 ("apparmor: add profile permission query ability")
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Acked-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Don't read past the end of the buffer containing permissions
characters or write past the end of the destination string.
Detected by CoverityScan CID#1415361, 1415376 ("Out-of-bounds access")
Fixes: e53cfe6c7c ("apparmor: rework perm mapping to a slightly broader set")
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Acked-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Pull AppArmor updates from John Johansen:
"Features
- add support for mapping secids and using secctxes
- add the ability to get a task's secid
- add support for audit rule filtering
Cleanups:
- multiple typo fixes
- Convert to use match_string() helper
- update git and wiki locations in AppArmor docs
- improve get_buffers macro by using get_cpu_ptr
- Use an IDR to allocate apparmor secids
Bug fixes:
- fix '*seclen' is never less than zero
- fix mediation of prlimit
- fix memory leak when deduping profile load
- fix ptrace read check
- fix memory leak of rule on error exit path"
* tag 'apparmor-pr-2018-06-13' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor: (21 commits)
apparmor: fix ptrace read check
apparmor: fix memory leak when deduping profile load
apparmor: fix mediation of prlimit
apparmor: fixup secid map conversion to using IDR
apparmor: Use an IDR to allocate apparmor secids
apparmor: Fix memory leak of rule on error exit path
apparmor: modify audit rule support to support profile stacks
apparmor: Add support for audit rule filtering
apparmor: update git and wiki locations in AppArmor docs
apparmor: Convert to use match_string() helper
apparmor: improve get_buffers macro by using get_cpu_ptr
apparmor: fix '*seclen' is never less than zero
apparmor: fix typo "preconfinement"
apparmor: fix typo "independent"
apparmor: fix typo "traverse"
apparmor: fix typo "type"
apparmor: fix typo "replace"
apparmor: fix typo "comparison"
apparmor: fix typo "loosen"
apparmor: add the ability to get a task's secid
...
The ptrace read check is incorrect resulting in policy that is
broader than it needs to be. Fix the check so that read access
permission can be properly detected when other ptrace flags are
set.
Fixes: b2d09ae449 ("apparmor: move ptrace checks to using labels")
Signed-off-by: John Johansen <john.johansen@canonical.com>
AppArmor is leaking the newly loaded profile and its proxy when
the profile is an exact match to the currently loaded version.
In this case the dedup check results in the profile being skipped and
put without dealing with the proxy ref thus not breaking a circular
refcount and causing a leak.
BugLink: http://bugs.launchpad.net/bugs/1750594
Fixes: 5d5182cae4 ("apparmor: move to per loaddata files, instead of replicating in profiles")
Signed-off-by: John Johansen <john.johansen@canonical.com>
For primit apparmor requires that if target confinement does not match
the setting task's confinement, the setting task requires CAP_SYS_RESOURCE.
Unfortunately this was broken when rlimit enforcement was reworked to
support labels.
Fixes: 86b92cb782 ("apparmor: move resource checks to using labels")
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>
Currently on the error exit path the allocated rule is not free'd
causing a memory leak. Fix this by calling aa_audit_rule_free().
Detected by CoverityScan, CID#1468966 ("Resource leaks")
Fixes: cb740f574c7b ("apparmor: modify audit rule support to support profile stacks")
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Allows for audit rules, where a rule could specify a profile stack
A//&B, while extending the current semantic so if the label specified
in the audit rule is a subset of the secid it is considered a match.
Eg. if the secid resolves to the label stack A//&B//&C
Then an audit rule specifying a label of
A - would match
B - would match
C - would match
D - would not
A//&B - would match as a subset
A//&C - would match as a subset
B//&C - would match as a subset
A//&B//&C - would match
A//&D - would not match, because while A does match, D is also
specified and does not
Note: audit rules are currently assumed to be coming from the root
namespace.
Signed-off-by: John Johansen <john.johansen@canonical.com>
This patch adds support to Apparmor for integrating with audit rule
filtering. Right now it only handles SUBJ_ROLE, interpreting it as a
single component of a label. This is sufficient to get Apparmor working
with IMA's appraisal rules without any modifications on the IMA side.
Signed-off-by: Matthew Garrett <mjg59@google.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Refactor get_buffers so the cpu_ptr can be obtained in the outer
layer, instead of inside the macro.
This also enables us to cleanup the code and use get_cpu_ptr,
to handle the preempt_disable()
Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Seth Arnold <seth.arnold@canonical.com>
