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net/ipv4: Use __DECLARE_FLEX_ARRAY() helper

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We now have a cleaner way to keep compatibility with user-space
(a.k.a. not breaking it) when we need to keep in place a one-element
array (for its use in user-space) together with a flexible-array
member (for its use in kernel-space) without making it hard to read
at the source level. This is through the use of the new
__DECLARE_FLEX_ARRAY() helper macro.

The size and memory layout of the structure is preserved after the
changes. See below.

Before changes:

$ pahole -C ip_msfilter net/ipv4/igmp.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 */
};

After changes:

$ pahole -C ip_msfilter net/ipv4/igmp.o
struct ip_msfilter {
	__be32                     imsf_multiaddr;       /*     0     4 */
	__be32                     imsf_interface;       /*     4     4 */
	__u32                      imsf_fmode;           /*     8     4 */
	__u32                      imsf_numsrc;          /*    12     4 */
	union {
		__be32             imsf_slist[1];        /*    16     4 */
		struct {
			struct {
			} __empty_imsf_slist_flex;       /*    16     0 */
			__be32     imsf_slist_flex[0];   /*    16     0 */
		};                                       /*    16     0 */
	};                                               /*    16     4 */

	/* size: 20, cachelines: 1, members: 5 */
	/* last cacheline: 20 bytes */
};

In the past, we had to duplicate the whole original structure within
a union, and update the names of all the members. Now, we just need to
declare the flexible-array member to be used in kernel-space through
the __DECLARE_FLEX_ARRAY() helper together with the one-element array,
within a union. This makes the source code more clean and easier to read.

Link: https://github.com/KSPP/linux/issues/193
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gustavo A. R. Silva 2022-08-31 14:12:42 -05:00 committed by David S. Miller
parent 2e5fb32232
commit 5854a09b49
1 changed files with 6 additions and 14 deletions
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20
include/uapi/linux/in.h
View file

@ -188,21 +188,13 @@ struct ip_mreq_source {
};
struct ip_msfilter {
__be32 imsf_multiaddr;
__be32 imsf_interface;
__u32 imsf_fmode;
__u32 imsf_numsrc;
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[];
};
__be32 imsf_slist[1];
__DECLARE_FLEX_ARRAY(__be32, imsf_slist_flex);
};
};