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authorKuniyuki Iwashima <kuniyu@amazon.com>2023-10-09 08:31:52 -0700
committerPaolo Abeni <pabeni@redhat.com>2023-10-12 09:15:15 +0200
commite2bca4870fdaf855651ee80b083d892599c5d982 (patch)
treee7b39472334d3b0ec8b61e3f5b61846a36ce2c9e /include
parent71c299c711d1f44f0bf04f1fea66baad565240f1 (diff)
af_packet: Fix fortified memcpy() without flex array.
Sergei Trofimovich reported a regression [0] caused by commit a0ade8404c3b ("af_packet: Fix warning of fortified memcpy() in packet_getname()."). It introduced a flex array sll_addr_flex in struct sockaddr_ll as a union-ed member with sll_addr to work around the fortified memcpy() check. However, a userspace program uses a struct that has struct sockaddr_ll in the middle, where a flex array is illegal to exist. include/linux/if_packet.h:24:17: error: flexible array member 'sockaddr_ll::<unnamed union>::<unnamed struct>::sll_addr_flex' not at end of 'struct packet_info_t' 24 | __DECLARE_FLEX_ARRAY(unsigned char, sll_addr_flex); | ^~~~~~~~~~~~~~~~~~~~ To fix the regression, let's go back to the first attempt [1] telling memcpy() the actual size of the array. Reported-by: Sergei Trofimovich <slyich@gmail.com> Closes: https://github.com/NixOS/nixpkgs/pull/252587#issuecomment-1741733002 [0] Link: https://lore.kernel.org/netdev/20230720004410.87588-3-kuniyu@amazon.com/ [1] Fixes: a0ade8404c3b ("af_packet: Fix warning of fortified memcpy() in packet_getname().") Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Link: https://lore.kernel.org/r/20231009153151.75688-1-kuniyu@amazon.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'include')
-rw-r--r--include/uapi/linux/if_packet.h6
1 files changed, 1 insertions, 5 deletions
diff --git a/include/uapi/linux/if_packet.h b/include/uapi/linux/if_packet.h
index 4d0ad22f83b5..9efc42382fdb 100644
--- a/include/uapi/linux/if_packet.h
+++ b/include/uapi/linux/if_packet.h
@@ -18,11 +18,7 @@ struct sockaddr_ll {
unsigned short sll_hatype;
unsigned char sll_pkttype;
unsigned char sll_halen;
- union {
- unsigned char sll_addr[8];
- /* Actual length is in sll_halen. */
- __DECLARE_FLEX_ARRAY(unsigned char, sll_addr_flex);
- };
+ unsigned char sll_addr[8];
};
/* Packet types */