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Date: Fri, 03 Oct 2014 14:40:21 +0300 From: Dmitry Kasatkin <d.kasatkin@...sung.com> To: zohar@...ux.vnet.ibm.com, linux-ima-devel@...ts.sourceforge.net, linux-security-module@...r.kernel.org Cc: linux-kernel@...r.kernel.org, dmitry.kasatkin@...il.com, Dmitry Kasatkin <d.kasatkin@...sung.com> Subject: [PATCH v2 4/4] ima: use atomic bit operations to protect policy update interface Current implementation uses atomic counter to provide exclusive access to the sysfs 'policy' entry to update the IMA policy. While practically it is almost unlikely, usage of counter might potentially allow another process to overflow the counter, open the interface and insert additional rules into the policy being loaded. This patch replace atomic counter with atomic bit operations which is more reliable and widely used to provide exclusive access. As bit operation keeps interface locked after successful update, it makes it unnecessary to verify if default policy was set or not during parsing and interface closing. This patch also removes it. Changes in v3: * move audit log message to ima_relead_policy() to report successful and unsuccessful result * unnecessary comment removed Changes in v2: * keep interface locked after successful policy load as in original design * remove sysfs entry as in original design Signed-off-by: Dmitry Kasatkin <d.kasatkin@...sung.com> --- security/integrity/ima/ima_fs.c | 23 ++++++++++++++++------- security/integrity/ima/ima_policy.c | 23 ++--------------------- 2 files changed, 18 insertions(+), 28 deletions(-) diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c index 16d8527..973b568 100644 --- a/security/integrity/ima/ima_fs.c +++ b/security/integrity/ima/ima_fs.c @@ -288,7 +288,12 @@ static struct dentry *runtime_measurements_count; static struct dentry *violations; static struct dentry *ima_policy; -static atomic_t policy_opencount = ATOMIC_INIT(1); +enum ima_fs_flags { + IMA_FS_BUSY, +}; + +static unsigned long ima_fs_flags; + /* * ima_open_policy: sequentialize access to the policy file */ @@ -297,9 +302,9 @@ static int ima_open_policy(struct inode *inode, struct file *filp) /* No point in being allowed to open it if you aren't going to write */ if (!(filp->f_flags & O_WRONLY)) return -EACCES; - if (atomic_dec_and_test(&policy_opencount)) - return 0; - return -EBUSY; + if (test_and_set_bit(IMA_FS_BUSY, &ima_fs_flags)) + return -EBUSY; + return 0; } /* @@ -311,12 +316,16 @@ static int ima_open_policy(struct inode *inode, struct file *filp) */ static int ima_release_policy(struct inode *inode, struct file *file) { - pr_info("IMA: policy update %s\n", - valid_policy ? "completed" : "failed"); + const char *cause = valid_policy ? "completed" : "failed"; + + pr_info("IMA: policy update %s\n", cause); + integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, NULL, + "policy_update", cause, !valid_policy, 0); + if (!valid_policy) { ima_delete_rules(); valid_policy = 1; - atomic_set(&policy_opencount, 1); + clear_bit(IMA_FS_BUSY, &ima_fs_flags); return 0; } ima_update_policy(); diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index d2c47d4..0d14d25 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -356,19 +356,8 @@ void __init ima_init_policy(void) */ void ima_update_policy(void) { - static const char op[] = "policy_update"; - const char *cause = "already-exists"; - int result = 1; - int audit_info = 0; - - if (ima_rules == &ima_default_rules) { - ima_rules = &ima_policy_rules; - ima_update_policy_flag(); - cause = "complete"; - result = 0; - } - integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, - NULL, op, cause, result, audit_info); + ima_rules = &ima_policy_rules; + ima_update_policy_flag(); } enum { @@ -686,14 +675,6 @@ ssize_t ima_parse_add_rule(char *rule) ssize_t result, len; int audit_info = 0; - /* Prevent installed policy from changing */ - if (ima_rules != &ima_default_rules) { - integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, - NULL, op, "already-exists", - -EACCES, audit_info); - return -EACCES; - } - p = strsep(&rule, "\n"); len = strlen(p) + 1; p += strspn(p, " \t"); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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