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| author | Shawn Landden <slandden@gmail.com> | 2017-12-16 21:41:37 -0800 |
|---|---|---|
| committer | Shawn Landden <slandden@gmail.com> | 2017-12-18 13:02:07 -0800 |
| commit | f11cba7479fe29a9dab9e3151bbca4302d173811 (patch) | |
| tree | 9b9b8c71dc98aee5f8a4863fa803b7df47b2c355 /src/libsystemd-network/dhcp-network.c | |
| parent | e51292485ab1da720c510e868e5d07986ca8ea1a (diff) | |
| download | systemd-f11cba7479fe29a9dab9e3151bbca4302d173811.tar.gz | |
libsystemd-network: fix unaligned loads (issue #7654)
should fix https://github.com/systemd/systemd/issues/7654
Also fix up mistaken endianness swap. BPF is native endianness.
Diffstat (limited to 'src/libsystemd-network/dhcp-network.c')
| -rw-r--r-- | src/libsystemd-network/dhcp-network.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/src/libsystemd-network/dhcp-network.c b/src/libsystemd-network/dhcp-network.c index 010090aef1..602bf08a60 100644 --- a/src/libsystemd-network/dhcp-network.c +++ b/src/libsystemd-network/dhcp-network.c @@ -32,6 +32,7 @@ #include "dhcp-internal.h" #include "fd-util.h" #include "socket-util.h" +#include "unaligned.h" static int _bind_raw_socket(int ifindex, union sockaddr_union *link, uint32_t xid, const uint8_t *mac_addr, @@ -70,13 +71,13 @@ static int _bind_raw_socket(int ifindex, union sockaddr_union *link, BPF_STMT(BPF_LD + BPF_W + BPF_ABS, offsetof(DHCPPacket, dhcp.xid)), /* A <- client identifier */ BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, xid, 1, 0), /* client identifier == xid ? */ BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */ - BPF_STMT(BPF_LD + BPF_IMM, htobe32(*((unsigned int *) eth_mac))), /* A <- 4 bytes of client's MAC */ + BPF_STMT(BPF_LD + BPF_IMM, unaligned_read_be32(ð_mac->ether_addr_octet[0])), /* A <- 4 bytes of client's MAC */ BPF_STMT(BPF_MISC + BPF_TAX, 0), /* X <- A */ BPF_STMT(BPF_LD + BPF_W + BPF_ABS, offsetof(DHCPPacket, dhcp.chaddr)), /* A <- 4 bytes of MAC from dhcp.chaddr */ BPF_STMT(BPF_ALU + BPF_XOR + BPF_X, 0), /* A xor X */ BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0, 1, 0), /* A == 0 ? */ BPF_STMT(BPF_RET + BPF_K, 0), /* ignore */ - BPF_STMT(BPF_LD + BPF_IMM, htobe16(*((unsigned short *) (((char *) eth_mac) + 4)))), /* A <- remainder of client's MAC */ + BPF_STMT(BPF_LD + BPF_IMM, unaligned_read_be16(ð_mac->ether_addr_octet[4])), /* A <- remainder of client's MAC */ BPF_STMT(BPF_MISC + BPF_TAX, 0), /* X <- A */ BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(DHCPPacket, dhcp.chaddr) + 4), /* A <- remainder of MAC from dhcp.chaddr */ BPF_STMT(BPF_ALU + BPF_XOR + BPF_X, 0), /* A xor X */ |