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audit: enable filename recording via getname_kernel()

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Enable recording of filenames in getname_kernel() and remove the
kludgy workaround in __audit_inode() now that we have proper filename
logging for kernel users.

CC: viro@zeniv.linux.org.uk
CC: linux-fsdevel@vger.kernel.org
Signed-off-by: Paul Moore <pmoore@redhat.com>
Reviewed-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Paul Moore 2015-01-22 00:00:10 -05:00 committed by Al Viro
parent cbaab2db91
commit fd3522fdc8
2 changed files with 4 additions and 37 deletions
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1
fs/namei.c
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@ -243,6 +243,7 @@ getname_kernel(const char * filename)
memcpy((char *)result->name, filename, len);
result->uptr = NULL;
result->aname = NULL;
audit_getname(result);
return result;
}

40
kernel/auditsc.c
View File

@ -1882,44 +1882,10 @@ void __audit_inode(struct filename *name, const struct dentry *dentry,
n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
if (!n)
return;
/* unfortunately, while we may have a path name to record with the
* inode, we can't always rely on the string lasting until the end of
* the syscall so we need to create our own copy, it may fail due to
* memory allocation issues, but we do our best */
if (name) {
/* we can't use getname_kernel() due to size limits */
size_t len = strlen(name->name) + 1;
struct filename *new = __getname();
if (name)
/* no need to set ->name_put as the original will cleanup */
n->name = name;
if (unlikely(!new))
goto out;
if (len <= (PATH_MAX - sizeof(*new))) {
new->name = (char *)(new) + sizeof(*new);
new->separate = false;
} else if (len <= PATH_MAX) {
/* this looks odd, but is due to final_putname() */
struct filename *new2;
new2 = kmalloc(sizeof(*new2), GFP_KERNEL);
if (unlikely(!new2)) {
__putname(new);
goto out;
}
new2->name = (char *)new;
new2->separate = true;
new = new2;
} else {
/* we should never get here, but let's be safe */
__putname(new);
goto out;
}
strlcpy((char *)new->name, name->name, len);
new->uptr = NULL;
new->aname = n;
n->name = new;
n->name_put = true;
}
out:
if (parent) {
n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL;