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Message-Id: <20220504014440.3697851-15-keescook@chromium.org>
Date: Tue, 3 May 2022 18:44:23 -0700
From: Kees Cook <keescook@...omium.org>
To: "Gustavo A . R . Silva" <gustavoars@...nel.org>
Cc: Kees Cook <keescook@...omium.org>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Kuniyuki Iwashima <kuniyu@...zon.co.jp>,
Alexei Starovoitov <ast@...nel.org>,
Cong Wang <cong.wang@...edance.com>,
Al Viro <viro@...iv.linux.org.uk>, netdev@...r.kernel.org,
alsa-devel@...a-project.org,
Andrew Gabbasov <andrew_gabbasov@...tor.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Andy Gross <agross@...nel.org>,
Andy Lavr <andy.lavr@...il.com>,
Arend van Spriel <aspriel@...il.com>,
Baowen Zheng <baowen.zheng@...igine.com>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Bradley Grove <linuxdrivers@...otech.com>,
brcm80211-dev-list.pdl@...adcom.com,
Christian Brauner <brauner@...nel.org>,
Christian Göttsche <cgzones@...glemail.com>,
Christian Lamparter <chunkeey@...glemail.com>,
Chris Zankel <chris@...kel.net>,
Daniel Axtens <dja@...ens.net>,
Daniel Vetter <daniel.vetter@...ll.ch>,
Dan Williams <dan.j.williams@...el.com>,
David Gow <davidgow@...gle.com>,
David Howells <dhowells@...hat.com>,
Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
devicetree@...r.kernel.org, Dexuan Cui <decui@...rosoft.com>,
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Eli Cohen <elic@...dia.com>,
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Eugeniu Rosca <erosca@...adit-jv.com>,
Felipe Balbi <balbi@...nel.org>,
Francis Laniel <laniel_francis@...vacyrequired.com>,
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Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
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Guenter Roeck <linux@...ck-us.net>,
Haiyang Zhang <haiyangz@...rosoft.com>,
Hante Meuleman <hante.meuleman@...adcom.com>,
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"Serge E. Hallyn" <serge@...lyn.com>,
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Udipto Goswami <quic_ugoswami@...cinc.com>,
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xen-devel@...ts.xenproject.org,
Xiu Jianfeng <xiujianfeng@...wei.com>,
Yang Yingliang <yangyingliang@...wei.com>
Subject: [PATCH 14/32] af_unix: Use mem_to_flex_dup() with struct unix_address
As part of the work to perform bounds checking on all memcpy() uses,
replace the open-coded a deserialization of bytes out of memory into a
trailing flexible array by using a flex_array.h helper to perform the
allocation, bounds checking, and copying.
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: Kuniyuki Iwashima <kuniyu@...zon.co.jp>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Cong Wang <cong.wang@...edance.com>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: netdev@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
include/net/af_unix.h | 14 ++++++++++++--
net/unix/af_unix.c | 7 ++-----
2 files changed, 14 insertions(+), 7 deletions(-)
diff --git a/include/net/af_unix.h b/include/net/af_unix.h
index a7ef624ed726..422535b71295 100644
--- a/include/net/af_unix.h
+++ b/include/net/af_unix.h
@@ -25,8 +25,18 @@ extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];
struct unix_address {
refcount_t refcnt;
- int len;
- struct sockaddr_un name[];
+ DECLARE_FLEX_ARRAY_ELEMENTS_COUNT(int, len);
+ union {
+ DECLARE_FLEX_ARRAY(struct sockaddr_un, name);
+ /*
+ * While a struct is used to access the flexible
+ * array, it may only be partially populated, and
+ * "len" above is actually tracking bytes, not a
+ * count of struct sockaddr_un elements, so also
+ * include a byte-size flexible array.
+ */
+ DECLARE_FLEX_ARRAY_ELEMENTS(u8, bytes);
+ };
};
struct unix_skb_parms {
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index e1dd9e9c8452..8410cbc82ded 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -244,15 +244,12 @@ EXPORT_SYMBOL_GPL(unix_peer_get);
static struct unix_address *unix_create_addr(struct sockaddr_un *sunaddr,
int addr_len)
{
- struct unix_address *addr;
+ struct unix_address *addr = NULL;
- addr = kmalloc(sizeof(*addr) + addr_len, GFP_KERNEL);
- if (!addr)
+ if (mem_to_flex_dup(&addr, sunaddr, addr_len, GFP_KERNEL))
return NULL;
refcount_set(&addr->refcnt, 1);
- addr->len = addr_len;
- memcpy(addr->name, sunaddr, addr_len);
return addr;
}
--
2.32.0
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