From 79f6530cb59e2a0af6953742a33cc29e98ca631c Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Mon, 8 Jul 2013 15:59:36 -0700 Subject: [PATCH] audit: fix mq_open and mq_unlink to add the MQ root as a hidden parent audit_names record The old audit PATH records for mq_open looked like this: type=PATH msg=audit(1366282323.982:869): item=1 name=(null) inode=6777 dev=00:0c mode=041777 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:tmpfs_t:s15:c0.c1023 type=PATH msg=audit(1366282323.982:869): item=0 name="test_mq" inode=26732 dev=00:0c mode=0100700 ouid=0 ogid=0 rdev=00:00 obj=staff_u:object_r:user_tmpfs_t:s15:c0.c1023 ...with the audit related changes that went into 3.7, they now look like this: type=PATH msg=audit(1366282236.776:3606): item=2 name=(null) inode=66655 dev=00:0c mode=0100700 ouid=0 ogid=0 rdev=00:00 obj=staff_u:object_r:user_tmpfs_t:s15:c0.c1023 type=PATH msg=audit(1366282236.776:3606): item=1 name=(null) inode=6926 dev=00:0c mode=041777 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:tmpfs_t:s15:c0.c1023 type=PATH msg=audit(1366282236.776:3606): item=0 name="test_mq" Both of these look wrong to me. As Steve Grubb pointed out: "What we need is 1 PATH record that identifies the MQ. The other PATH records probably should not be there." Fix it to record the mq root as a parent, and flag it such that it should be hidden from view when the names are logged, since the root of the mq filesystem isn't terribly interesting. With this change, we get a single PATH record that looks more like this: type=PATH msg=audit(1368021604.836:484): item=0 name="test_mq" inode=16914 dev=00:0c mode=0100644 ouid=0 ogid=0 rdev=00:00 obj=unconfined_u:object_r:user_tmpfs_t:s0 In order to do this, a new audit_inode_parent_hidden() function is added. If we do it this way, then we avoid having the existing callers of audit_inode needing to do any sort of flag conversion if auditing is inactive. Signed-off-by: Jeff Layton Reported-by: Jiri Jaburek Cc: Steve Grubb Cc: Eric Paris Cc: Al Viro Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/audit.h | 26 ++++++++++++++++++++++---- ipc/mqueue.c | 2 ++ kernel/audit.h | 1 + kernel/auditsc.c | 12 +++++++++--- 4 files changed, 34 insertions(+), 7 deletions(-) diff --git a/include/linux/audit.h b/include/linux/audit.h index b20b03852f21..729a4d165bcc 100644 --- a/include/linux/audit.h +++ b/include/linux/audit.h @@ -103,8 +103,11 @@ extern void __audit_syscall_exit(int ret_success, long ret_value); extern struct filename *__audit_reusename(const __user char *uptr); extern void __audit_getname(struct filename *name); extern void audit_putname(struct filename *name); + +#define AUDIT_INODE_PARENT 1 /* dentry represents the parent */ +#define AUDIT_INODE_HIDDEN 2 /* audit record should be hidden */ extern void __audit_inode(struct filename *name, const struct dentry *dentry, - unsigned int parent); + unsigned int flags); extern void __audit_inode_child(const struct inode *parent, const struct dentry *dentry, const unsigned char type); @@ -148,10 +151,22 @@ static inline void audit_getname(struct filename *name) if (unlikely(!audit_dummy_context())) __audit_getname(name); } -static inline void audit_inode(struct filename *name, const struct dentry *dentry, +static inline void audit_inode(struct filename *name, + const struct dentry *dentry, unsigned int parent) { + if (unlikely(!audit_dummy_context())) { + unsigned int flags = 0; + if (parent) + flags |= AUDIT_INODE_PARENT; + __audit_inode(name, dentry, flags); + } +} +static inline void audit_inode_parent_hidden(struct filename *name, + const struct dentry *dentry) +{ if (unlikely(!audit_dummy_context())) - __audit_inode(name, dentry, parent); + __audit_inode(name, dentry, + AUDIT_INODE_PARENT | AUDIT_INODE_HIDDEN); } static inline void audit_inode_child(const struct inode *parent, const struct dentry *dentry, @@ -311,7 +326,7 @@ static inline void audit_putname(struct filename *name) { } static inline void __audit_inode(struct filename *name, const struct dentry *dentry, - unsigned int parent) + unsigned int flags) { } static inline void __audit_inode_child(const struct inode *parent, const struct dentry *dentry, @@ -321,6 +336,9 @@ static inline void audit_inode(struct filename *name, const struct dentry *dentry, unsigned int parent) { } +static inline void audit_inode_parent_hidden(struct filename *name, + const struct dentry *dentry) +{ } static inline void audit_inode_child(const struct inode *parent, const struct dentry *dentry, const unsigned char type) diff --git a/ipc/mqueue.c b/ipc/mqueue.c index e4e47f647446..ae1996d3c539 100644 --- a/ipc/mqueue.c +++ b/ipc/mqueue.c @@ -823,6 +823,7 @@ SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, umode_t, mode, error = ro; goto out; } + audit_inode_parent_hidden(name, root); filp = do_create(ipc_ns, root->d_inode, &path, oflag, mode, u_attr ? &attr : NULL); @@ -868,6 +869,7 @@ SYSCALL_DEFINE1(mq_unlink, const char __user *, u_name) if (IS_ERR(name)) return PTR_ERR(name); + audit_inode_parent_hidden(name, mnt->mnt_root); err = mnt_want_write(mnt); if (err) goto out_name; diff --git a/kernel/audit.h b/kernel/audit.h index 1c95131ef760..123c9b7c3979 100644 --- a/kernel/audit.h +++ b/kernel/audit.h @@ -85,6 +85,7 @@ struct audit_names { struct filename *name; int name_len; /* number of chars to log */ + bool hidden; /* don't log this record */ bool name_put; /* call __putname()? */ unsigned long ino; diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 3c8a601324a2..9845cb32b60a 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -1399,8 +1399,11 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts } i = 0; - list_for_each_entry(n, &context->names_list, list) + list_for_each_entry(n, &context->names_list, list) { + if (n->hidden) + continue; audit_log_name(context, n, NULL, i++, &call_panic); + } /* Send end of event record to help user space know we are finished */ ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE); @@ -1769,14 +1772,15 @@ void audit_putname(struct filename *name) * __audit_inode - store the inode and device from a lookup * @name: name being audited * @dentry: dentry being audited - * @parent: does this dentry represent the parent? + * @flags: attributes for this particular entry */ void __audit_inode(struct filename *name, const struct dentry *dentry, - unsigned int parent) + unsigned int flags) { struct audit_context *context = current->audit_context; const struct inode *inode = dentry->d_inode; struct audit_names *n; + bool parent = flags & AUDIT_INODE_PARENT; if (!context->in_syscall) return; @@ -1831,6 +1835,8 @@ out: if (parent) { n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL; n->type = AUDIT_TYPE_PARENT; + if (flags & AUDIT_INODE_HIDDEN) + n->hidden = true; } else { n->name_len = AUDIT_NAME_FULL; n->type = AUDIT_TYPE_NORMAL; -- 2.20.1