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[PATCH] fix faulty inode data collection for open() with O_CREAT

Browse source 
When the specified path is an existing file or when it is a symlink, audit
collects the wrong inode number, which causes it to miss the open() event.
Adding a second hook to the open() path fixes this.

Also add audit_copy_inode() to consolidate some code.

Signed-off-by: Amy Griffis <amy.griffis@hp.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Amy Griffis 2006-07-13 13:16:02 -04:00 committed by Al Viro
parent 46f5960fdb
commit 3e2efce067
3 changed files with 50 additions and 22 deletions
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2
fs/namei.c
View file

@ -1659,6 +1659,7 @@ do_last:
* It already exists.
*/
mutex_unlock(&dir->d_inode->i_mutex);
audit_inode_update(path.dentry->d_inode);
error = -EEXIST;
if (flag & O_EXCL)
@ -1669,6 +1670,7 @@ do_last:
if (flag & O_NOFOLLOW)
goto exit_dput;
}
error = -ENOENT;
if (!path.dentry->d_inode)
goto exit_dput;

7
include/linux/audit.h
View file

@ -328,6 +328,7 @@ extern void audit_putname(const char *name);
extern void __audit_inode(const char *name, const struct inode *inode);
extern void __audit_inode_child(const char *dname, const struct inode *inode,
unsigned long pino);
extern void __audit_inode_update(const struct inode *inode);
static inline void audit_getname(const char *name)
{
if (unlikely(current->audit_context))
@ -343,6 +344,10 @@ static inline void audit_inode_child(const char *dname,
if (unlikely(current->audit_context))
__audit_inode_child(dname, inode, pino);
}
static inline void audit_inode_update(const struct inode *inode) {
if (unlikely(current->audit_context))
__audit_inode_update(inode);
}
/* Private API (for audit.c only) */
extern unsigned int audit_serial(void);
@ -414,8 +419,10 @@ static inline int audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
#define audit_putname(n) do { ; } while (0)
#define __audit_inode(n,i) do { ; } while (0)
#define __audit_inode_child(d,i,p) do { ; } while (0)
#define __audit_inode_update(i) do { ; } while (0)
#define audit_inode(n,i) do { ; } while (0)
#define audit_inode_child(d,i,p) do { ; } while (0)
#define audit_inode_update(i) do { ; } while (0)
#define auditsc_get_stamp(c,t,s) do { BUG(); } while (0)
#define audit_get_loginuid(c) ({ -1; })
#define audit_ipc_obj(i) ({ 0; })

61
kernel/auditsc.c
View file

@ -1199,14 +1199,18 @@ void audit_putname(const char *name)
#endif
}
static void audit_inode_context(int idx, const struct inode *inode)
/* Copy inode data into an audit_names. */
static void audit_copy_inode(struct audit_names *name, const struct inode *inode)
{
struct audit_context *context = current->audit_context;
selinux_get_inode_sid(inode, &context->names[idx].osid);
name->ino = inode->i_ino;
name->dev = inode->i_sb->s_dev;
name->mode = inode->i_mode;
name->uid = inode->i_uid;
name->gid = inode->i_gid;
name->rdev = inode->i_rdev;
selinux_get_inode_sid(inode, &name->osid);
}
/**
* audit_inode - store the inode and device from a lookup
* @name: name being audited
@ -1240,13 +1244,7 @@ void __audit_inode(const char *name, const struct inode *inode)
++context->ino_count;
#endif
}
context->names[idx].ino = inode->i_ino;
context->names[idx].dev = inode->i_sb->s_dev;
context->names[idx].mode = inode->i_mode;
context->names[idx].uid = inode->i_uid;
context->names[idx].gid = inode->i_gid;
context->names[idx].rdev = inode->i_rdev;
audit_inode_context(idx, inode);
audit_copy_inode(&context->names[idx], inode);
}
/**
@ -1302,16 +1300,37 @@ update_context:
context->names[idx].name_len = AUDIT_NAME_FULL;
context->names[idx].name_put = 0; /* don't call __putname() */
if (inode) {
context->names[idx].ino = inode->i_ino;
context->names[idx].dev = inode->i_sb->s_dev;
context->names[idx].mode = inode->i_mode;
context->names[idx].uid = inode->i_uid;
context->names[idx].gid = inode->i_gid;
context->names[idx].rdev = inode->i_rdev;
audit_inode_context(idx, inode);
} else
if (!inode)
context->names[idx].ino = (unsigned long)-1;
else
audit_copy_inode(&context->names[idx], inode);
}
/**
* audit_inode_update - update inode info for last collected name
* @inode: inode being audited
*
* When open() is called on an existing object with the O_CREAT flag, the inode
* data audit initially collects is incorrect. This additional hook ensures
* audit has the inode data for the actual object to be opened.
*/
void __audit_inode_update(const struct inode *inode)
{
struct audit_context *context = current->audit_context;
int idx;
if (!context->in_syscall || !inode)
return;
if (context->name_count == 0) {
context->name_count++;
#if AUDIT_DEBUG
context->ino_count++;
#endif
}
idx = context->name_count - 1;
audit_copy_inode(&context->names[idx], inode);
}
/**