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[24.9.64.241]) by smtp.gmail.com with ESMTPSA id o14sm123971ilg.71.2020.11.10.11.54.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Nov 2020 11:54:51 -0800 (PST) From: Shuah Khan To: zohar@linux.ibm.com, dmitry.kasatkin@gmail.com, jmorris@namei.org, serge@hallyn.com, gregkh@linuxfoundation.org, keescook@chromium.org, peterz@infradead.org Cc: Shuah Khan , linux-security-module@vger.kernel.org, linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 13/13] security/integrity/ima: converts stats to seqnum_ops Date: Tue, 10 Nov 2020 12:53:39 -0700 Message-Id: X-Mailer: git-send-email 2.27.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: seqnum_ops api is introduced to be used when a variable is used as a sequence/stat counter and doesn't guard object lifetimes. This clearly differentiates atomic_t usages that guard object lifetimes. seqnum32 variables wrap around to INT_MIN when it overflows and should not be used to guard resource lifetimes, device usage and open counts that control state changes, and pm states. atomic_t variables used for eima_htable.violations and number of stored measurements and ios_threshold are atomic counters, and violations is only an idicator and can overflow. No chane to the behavior with this change. Signed-off-by: Shuah Khan Reported-by: kernel test robot --- security/integrity/ima/ima.h | 5 +++-- security/integrity/ima/ima_api.c | 2 +- security/integrity/ima/ima_fs.c | 4 ++-- security/integrity/ima/ima_queue.c | 7 ++++--- 4 files changed, 10 insertions(+), 8 deletions(-) diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index 6ebefec616e4..55fe1d14c67a 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -21,6 +21,7 @@ #include #include #include +#include #include "../integrity.h" @@ -174,8 +175,8 @@ int ima_lsm_policy_change(struct notifier_block *nb, unsigned long event, extern spinlock_t ima_queue_lock; struct ima_h_table { - atomic_long_t len; /* number of stored measurements in the list */ - atomic_long_t violations; + struct seqnum64 len; /* number of stored measurements in the list */ + struct seqnum64 violations; struct hlist_head queue[IMA_MEASURE_HTABLE_SIZE]; }; extern struct ima_h_table ima_htable; diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c index 4f39fb93f278..b1a203435698 100644 --- a/security/integrity/ima/ima_api.c +++ b/security/integrity/ima/ima_api.c @@ -144,7 +144,7 @@ void ima_add_violation(struct file *file, const unsigned char *filename, int result; /* can overflow, only indicator */ - atomic_long_inc(&ima_htable.violations); + seqnum64_inc(&ima_htable.violations); result = ima_alloc_init_template(&event_data, &entry, NULL); if (result < 0) { diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c index ea8ff8a07b36..03a78b445052 100644 --- a/security/integrity/ima/ima_fs.c +++ b/security/integrity/ima/ima_fs.c @@ -39,12 +39,12 @@ __setup("ima_canonical_fmt", default_canonical_fmt_setup); static int valid_policy = 1; static ssize_t ima_show_htable_value(char __user *buf, size_t count, - loff_t *ppos, atomic_long_t *val) + loff_t *ppos, struct seqnum64 *val) { char tmpbuf[32]; /* greater than largest 'long' string value */ ssize_t len; - len = scnprintf(tmpbuf, sizeof(tmpbuf), "%li\n", atomic_long_read(val)); + len = scnprintf(tmpbuf, sizeof(tmpbuf), "%lli\n", seqnum64_read(val)); return simple_read_from_buffer(buf, count, ppos, tmpbuf, len); } diff --git a/security/integrity/ima/ima_queue.c b/security/integrity/ima/ima_queue.c index c096ef8945c7..87db50dd1721 100644 --- a/security/integrity/ima/ima_queue.c +++ b/security/integrity/ima/ima_queue.c @@ -17,6 +17,7 @@ #include #include +#include #include "ima.h" #define AUDIT_CAUSE_LEN_MAX 32 @@ -33,8 +34,8 @@ static unsigned long binary_runtime_size = ULONG_MAX; /* key: inode (before secure-hashing a file) */ struct ima_h_table ima_htable = { - .len = ATOMIC_LONG_INIT(0), - .violations = ATOMIC_LONG_INIT(0), + .len = SEQNUM_INIT(0), + .violations = SEQNUM_INIT(0), .queue[0 ... IMA_MEASURE_HTABLE_SIZE - 1] = HLIST_HEAD_INIT }; @@ -106,7 +107,7 @@ static int ima_add_digest_entry(struct ima_template_entry *entry, INIT_LIST_HEAD(&qe->later); list_add_tail_rcu(&qe->later, &ima_measurements); - atomic_long_inc(&ima_htable.len); + seqnum64_inc(&ima_htable.len); if (update_htable) { key = ima_hash_key(entry->digests[ima_hash_algo_idx].digest); hlist_add_head_rcu(&qe->hnext, &ima_htable.queue[key]);