kernel/linux.git/security/tomoyo, branch v5.16.18

tomoyo: use hwight16() in tomoyo_domain_quota_is_ok()

2021-12-15T11:13:55+00:00

hwight16() is much faster. While we are at it, no need to include "perm =" part into data_race() macro, for perm is a local variable that cannot be accessed by other threads. Signed-off-by: Tetsuo Handa

tomoyo: Check exceeded quota early in tomoyo_domain_quota_is_ok().

2021-12-15T11:11:07+00:00

If tomoyo is used in a testing/fuzzing environment in learning mode, for lots of domains the quota will be exceeded and stay exceeded for prolonged periods of time. In such cases it's pointless (and slow) to walk the whole acl list again and again just to rediscover that the quota is exceeded. We already have the TOMOYO_DIF_QUOTA_WARNED flag that notes the overflow condition. Check it early to avoid the slowdown. [penguin-kernel] This patch causes a user visible change that the learning mode will not be automatically resumed after the quota is increased. To resume the learning mode, administrator will need to explicitly clear TOMOYO_DIF_QUOTA_WARNED flag after increasing the quota. But I think that this change is generally preferable, for administrator likely wants to optimize the acl list for that domain before increasing the quota, or that domain likely hits the quota again. Therefore, don't try to care to clear TOMOYO_DIF_QUOTA_WARNED flag automatically when the quota for that domain changed. Signed-off-by: Dmitry Vyukov Signed-off-by: Tetsuo Handa

mm/pagemap: add mmap_assert_locked() annotations to find_vma*()

2021-09-03T16:58:13+00:00

find_vma() and variants need protection when used. This patch adds mmap_assert_lock() calls in the functions. To make sure the invariant is satisfied, we also need to add a mmap_read_lock() around the get_user_pages_remote() call in get_arg_page(). The lock is not strictly necessary because the mm has been newly created, but the extra cost is limited because the same mutex was also acquired shortly before in __bprm_mm_init(), so it is hot and uncontended. [penguin-kernel@i-love.sakura.ne.jp: TOMOYO needs the same protection which get_arg_page() needs] Link: https://lkml.kernel.org/r/58bb6bf7-a57e-8a40-e74b-39584b415152@i-love.sakura.ne.jp Link: https://lkml.kernel.org/r/20210731175341.3458608-1-lrizzo@google.com Signed-off-by: Luigi Rizzo Cc: David Rientjes Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

tomoyo: fix doc warnings

2021-06-15T15:01:28+00:00

Fix gcc W=1 warnings: security/tomoyo/audit.c:331: warning: Function parameter or member 'matched_acl' not described in 'tomoyo_get_audit' security/tomoyo/securityfs_if.c:146: warning: Function parameter or member 'inode' not described in 'tomoyo_release' security/tomoyo/tomoyo.c:122: warning: Function parameter or member 'path' not described in 'tomoyo_inode_getattr' security/tomoyo/tomoyo.c:497: warning: Function parameter or member 'clone_flags' not described in 'tomoyo_task_alloc' security/tomoyo/util.c:92: warning: Function parameter or member 'time64' not described in 'tomoyo_convert_time' Signed-off-by: ChenXiaoSong [ penguin-kernel: Also adjust spaces and similar warnings ] Signed-off-by: Tetsuo Handa

tomoyo: don't special case PF_IO_WORKER for PF_KTHREAD

2021-03-28T04:11:29+00:00

Since commit 3bfe6106693b6b4b ("io-wq: fork worker threads from original task") stopped using PF_KTHREAD flag for the io_uring PF_IO_WORKER threads, tomoyo_kernel_service() no longer needs to check PF_IO_WORKER flag. (This is a 5.12+ patch. Please don't send to stable kernels.) Signed-off-by: Jens Axboe Signed-off-by: Tetsuo Handa

tomoyo: recognize kernel threads correctly

2021-02-01T02:53:05+00:00

Commit db68ce10c4f0a27c ("new helper: uaccess_kernel()") replaced segment_eq(get_fs(), KERNEL_DS) with uaccess_kernel(). But the correct method for tomoyo to check whether current is a kernel thread in order to assume that kernel threads are privileged for socket operations was (current->flags & PF_KTHREAD). Now that uaccess_kernel() became 0 on x86, tomoyo has to fix this problem. Do like commit 942cb357ae7d9249 ("Smack: Handle io_uring kernel thread privileges") does. Signed-off-by: Tetsuo Handa

tomoyo: ignore data race while checking quota

2021-02-01T02:52:11+00:00

syzbot is reporting that tomoyo's quota check is racy [1]. But this check is tolerant of some degree of inaccuracy. Thus, teach KCSAN to ignore this data race. [1] https://syzkaller.appspot.com/bug?id=999533deec7ba6337f8aa25d8bd1a4d5f7e50476 Reported-by: syzbot Signed-off-by: Tetsuo Handa

tomoyo: Fix typo in comments.

2020-12-06T04:44:57+00:00

Spotted by developers and codespell program. Co-developed-by: Xiaoming Ni Signed-off-by: Xiaoming Ni Co-developed-by: Souptick Joarder Signed-off-by: Souptick Joarder Signed-off-by: Tetsuo Handa

tomoyo: Fix null pointer check

2020-11-27T10:36:11+00:00

Since tomoyo_memory_ok() will check for null pointer returned by kzalloc() in tomoyo_assign_profile(), tomoyo_assign_namespace(), tomoyo_get_name() and tomoyo_commit_ok(), then emit OOM warnings if needed. And this is the expected behavior as informed by Tetsuo Handa. Let's add __GFP_NOWARN to kzalloc() in those related functions. Besides, to achieve this goal, remove the null check for entry right after kzalloc() in tomoyo_assign_namespace(). Reported-by: Hulk Robot Suggested-by: Tetsuo Handa Signed-off-by: Zheng Zengkai Signed-off-by: Tetsuo Handa

tomoyo: Limit wildcard recursion depth.

2020-11-03T04:50:02+00:00

Since wildcards that need recursion consume kernel stack memory (or might cause CPU stall warning problem), we cannot allow infinite recursion. Since TOMOYO 1.8 survived with 20 recursions limit for 5 years, nobody would complain if applying this limit to TOMOYO 2.6. Signed-off-by: Tetsuo Handa