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AUDIT: Fix remaining cases of direct logging of untrusted strings by avc_audit

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Per Steve Grubb's observation that there are some remaining cases where
avc_audit() directly logs untrusted strings without escaping them, here
is a patch that changes avc_audit() to use audit_log_untrustedstring()
or audit_log_hex() as appropriate.  Note that d_name.name is nul-
terminated by d_alloc(), and that sun_path is nul-terminated by
unix_mkname(), so it is not necessary for the AVC to create nul-
terminated copies or to alter audit_log_untrustedstring to take a length
argument.  In the case of an abstract name, we use audit_log_hex() with
an explicit length.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
Stephen Smalley 2005-05-24 21:28:28 +01:00 committed by David Woodhouse
parent 99e45eeac8
commit 37ca5389b8
1 changed files with 9 additions and 13 deletions
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22
security/selinux/avc.c
View file

@ -575,16 +575,16 @@ void avc_audit(u32 ssid, u32 tsid,
struct dentry *dentry = a->u.fs.dentry;
if (a->u.fs.mnt)
audit_avc_path(dentry, a->u.fs.mnt);
audit_log_format(ab, " name=%s",
dentry->d_name.name);
audit_log_format(ab, " name=");
audit_log_untrustedstring(ab, dentry->d_name.name);
inode = dentry->d_inode;
} else if (a->u.fs.inode) {
struct dentry *dentry;
inode = a->u.fs.inode;
dentry = d_find_alias(inode);
if (dentry) {
audit_log_format(ab, " name=%s",
dentry->d_name.name);
audit_log_format(ab, " name=");
audit_log_untrustedstring(ab, dentry->d_name.name);
dput(dentry);
}
}
@ -628,23 +628,19 @@ void avc_audit(u32 ssid, u32 tsid,
u = unix_sk(sk);
if (u->dentry) {
audit_avc_path(u->dentry, u->mnt);
audit_log_format(ab, " name=%s",
u->dentry->d_name.name);
audit_log_format(ab, " name=");
audit_log_untrustedstring(ab, u->dentry->d_name.name);
break;
}
if (!u->addr)
break;
len = u->addr->len-sizeof(short);
p = &u->addr->name->sun_path[0];
audit_log_format(ab, " path=");
if (*p)
audit_log_format(ab,
"path=%*.*s", len,
len, p);
audit_log_untrustedstring(ab, p);
else
audit_log_format(ab,
"path=@%*.*s", len-1,
len-1, p+1);
audit_log_hex(ab, p, len);
break;
}
}