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audit: allow audit code to satisfy getname requests from its names_list

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Currently, if we call getname() on a userland string more than once,
we'll get multiple copies of the string and multiple audit_names
records.

Add a function that will allow the audit_names code to satisfy getname
requests using info from the audit_names list, avoiding a new allocation
and audit_names records.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Jeff Layton 2012-10-10 15:25:28 -04:00 • committed by Al Viro
parent 91a27b2a75
commit 7ac86265dc
3 changed files with 38 additions and 0 deletions
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23
kernel/auditsc.c
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@ -2020,6 +2020,29 @@ static struct audit_names *audit_alloc_name(struct audit_context *context,
return aname;
}
/**
* audit_reusename - fill out filename with info from existing entry
* @uptr: userland ptr to pathname
*
* Search the audit_names list for the current audit context. If there is an
* existing entry with a matching "uptr" then return the filename
* associated with that audit_name. If not, return NULL.
*/
struct filename *
__audit_reusename(const __user char *uptr)
{
struct audit_context *context = current->audit_context;
struct audit_names *n;
list_for_each_entry(n, &context->names_list, list) {
if (!n->name)
continue;
if (n->name->uptr == uptr)
return n->name;
}
return NULL;
}
/**
* audit_getname - add a name to the list
* @name: name to add