Patch "net/ipv4: Replace one-element array with flexible-array member" has been added to the 5.10-stable tree

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This is a note to let you know that I've just added the patch titled

    net/ipv4: Replace one-element array with flexible-array member

to the 5.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     net-ipv4-replace-one-element-array-with-flexible-arr.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit e4b1b58d8759210a2dedfa5817b2ba7088c6dc39
Author: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
Date:   Sat Jul 31 12:08:30 2021 -0500

    net/ipv4: Replace one-element array with flexible-array member
    
    [ Upstream commit 2d3e5caf96b9449af951e63476657acd759c1a30 ]
    
    There is a regular need in the kernel to provide a way to declare having
    a dynamically sized set of trailing elements in a structure. Kernel code
    should always use “flexible array members”[1] for these cases. The older
    style of one-element or zero-length arrays should no longer be used[2].
    
    Use an anonymous union with a couple of anonymous structs in order to
    keep userspace unchanged:
    
    $ pahole -C ip_msfilter net/ipv4/ip_sockglue.o
    struct ip_msfilter {
            union {
                    struct {
                            __be32     imsf_multiaddr_aux;   /*     0     4 */
                            __be32     imsf_interface_aux;   /*     4     4 */
                            __u32      imsf_fmode_aux;       /*     8     4 */
                            __u32      imsf_numsrc_aux;      /*    12     4 */
                            __be32     imsf_slist[1];        /*    16     4 */
                    };                                       /*     0    20 */
                    struct {
                            __be32     imsf_multiaddr;       /*     0     4 */
                            __be32     imsf_interface;       /*     4     4 */
                            __u32      imsf_fmode;           /*     8     4 */
                            __u32      imsf_numsrc;          /*    12     4 */
                            __be32     imsf_slist_flex[0];   /*    16     0 */
                    };                                       /*     0    16 */
            };                                               /*     0    20 */
    
            /* size: 20, cachelines: 1, members: 1 */
            /* last cacheline: 20 bytes */
    };
    
    Also, refactor the code accordingly and make use of the struct_size()
    and flex_array_size() helpers.
    
    This helps with the ongoing efforts to globally enable -Warray-bounds
    and get us closer to being able to tighten the FORTIFY_SOURCE routines
    on memcpy().
    
    [1] https://en.wikipedia.org/wiki/Flexible_array_member
    [2] https://www.kernel.org/doc/html/v5.10/process/deprecated.html#zero-length-and-one-element-arrays
    
    Link: https://github.com/KSPP/linux/issues/79
    Link: https://github.com/KSPP/linux/issues/109
    Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
    Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
    Stable-dep-of: 5c3be3e0eb44 ("ipmr: fix incorrect parameter validation in the ip_mroute_getsockopt() function")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/include/uapi/linux/in.h b/include/uapi/linux/in.h
index 3960bc3da6b30..066098a5b9360 100644
--- a/include/uapi/linux/in.h
+++ b/include/uapi/linux/in.h
@@ -190,11 +190,22 @@ struct ip_mreq_source {
 };
 
 struct ip_msfilter {
-	__be32		imsf_multiaddr;
-	__be32		imsf_interface;
-	__u32		imsf_fmode;
-	__u32		imsf_numsrc;
-	__be32		imsf_slist[1];
+	union {
+		struct {
+			__be32		imsf_multiaddr_aux;
+			__be32		imsf_interface_aux;
+			__u32		imsf_fmode_aux;
+			__u32		imsf_numsrc_aux;
+			__be32		imsf_slist[1];
+		};
+		struct {
+			__be32		imsf_multiaddr;
+			__be32		imsf_interface;
+			__u32		imsf_fmode;
+			__u32		imsf_numsrc;
+			__be32		imsf_slist_flex[];
+		};
+	};
 };
 
 #define IP_MSFILTER_SIZE(numsrc) \
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index cb55fede03c04..134f1682a7e9b 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -2493,8 +2493,8 @@ int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
 			goto done;
 		}
 		newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
-		memcpy(newpsl->sl_addr, msf->imsf_slist,
-			msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
+		memcpy(newpsl->sl_addr, msf->imsf_slist_flex,
+		       flex_array_size(msf, imsf_slist_flex, msf->imsf_numsrc));
 		err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
 			msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
 		if (err) {
@@ -2571,14 +2571,14 @@ int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
 		count = psl->sl_count;
 	}
 	copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
-	len = copycount * sizeof(psl->sl_addr[0]);
+	len = flex_array_size(psl, sl_addr, copycount);
 	msf->imsf_numsrc = count;
-	if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
-	    copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
+	if (put_user(struct_size(optval, imsf_slist_flex, copycount), optlen) ||
+	    copy_to_user(optval, msf, struct_size(optval, imsf_slist_flex, 0))) {
 		return -EFAULT;
 	}
 	if (len &&
-	    copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
+	    copy_to_user(&optval->imsf_slist_flex[0], psl->sl_addr, len))
 		return -EFAULT;
 	return 0;
 done:
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 1b35afd326b8d..2cfc507712300 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -670,12 +670,11 @@ static int set_mcast_msfilter(struct sock *sk, int ifindex,
 			      struct sockaddr_storage *group,
 			      struct sockaddr_storage *list)
 {
-	int msize = IP_MSFILTER_SIZE(numsrc);
 	struct ip_msfilter *msf;
 	struct sockaddr_in *psin;
 	int err, i;
 
-	msf = kmalloc(msize, GFP_KERNEL);
+	msf = kmalloc(struct_size(msf, imsf_slist_flex, numsrc), GFP_KERNEL);
 	if (!msf)
 		return -ENOBUFS;
 
@@ -691,7 +690,7 @@ static int set_mcast_msfilter(struct sock *sk, int ifindex,
 
 		if (psin->sin_family != AF_INET)
 			goto Eaddrnotavail;
-		msf->imsf_slist[i] = psin->sin_addr.s_addr;
+		msf->imsf_slist_flex[i] = psin->sin_addr.s_addr;
 	}
 	err = ip_mc_msfilter(sk, msf, ifindex);
 	kfree(msf);
@@ -1236,7 +1235,7 @@ static int do_ip_setsockopt(struct sock *sk, int level, int optname,
 	{
 		struct ip_msfilter *msf;
 
-		if (optlen < IP_MSFILTER_SIZE(0))
+		if (optlen < struct_size(msf, imsf_slist_flex, 0))
 			goto e_inval;
 		if (optlen > READ_ONCE(sysctl_optmem_max)) {
 			err = -ENOBUFS;
@@ -1254,7 +1253,8 @@ static int do_ip_setsockopt(struct sock *sk, int level, int optname,
 			err = -ENOBUFS;
 			break;
 		}
-		if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
+		if (struct_size(msf, imsf_slist_flex, msf->imsf_numsrc) >
+		    optlen) {
 			kfree(msf);
 			err = -EINVAL;
 			break;
@@ -1667,11 +1667,12 @@ static int do_ip_getsockopt(struct sock *sk, int level, int optname,
 	{
 		struct ip_msfilter msf;
 
-		if (len < IP_MSFILTER_SIZE(0)) {
+		if (len < struct_size(&msf, imsf_slist_flex, 0)) {
 			err = -EINVAL;
 			goto out;
 		}
-		if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
+		if (copy_from_user(&msf, optval,
+				   struct_size(&msf, imsf_slist_flex, 0))) {
 			err = -EFAULT;
 			goto out;
 		}




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