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| author | Jo-Philipp Wich <jow@openwrt.org> | 2013-12-06 15:42:35 +0000 |
|---|---|---|
| committer | Jo-Philipp Wich <jow@openwrt.org> | 2013-12-06 15:42:35 +0000 |
| commit | bfb6e025dc47c294deb14cf2bb6f59254d335416 (patch) | |
| tree | 921ad3c1ed219364b5d180213c4cbe115ca9343f /target | |
| parent | a2f91b864fc563cd94144e0b136322a21c50bbeb (diff) | |
| download | upstream-bfb6e025dc47c294deb14cf2bb6f59254d335416.tar.gz upstream-bfb6e025dc47c294deb14cf2bb6f59254d335416.tar.bz2 upstream-bfb6e025dc47c294deb14cf2bb6f59254d335416.zip | |
generic: workaround arptables arpt_arp structure padding issue (#14577)
Linaro GCC 4.6-2013.05 incorrectly pads the arpt_arp structure on
at least the ar71xx target, resulting in a two bytes shorter struct
in the kernel compared to what arptables userspace expects.
When comparing sizeof(struct arpt_arp) in kernel and userspace, the
former yields 162 byte, while the latter is 164 byte.
As a consequence, the subsequent target_offset and next_offset
members of the parent arpt_entry structure contain invalid values
when processed by the arptables binary, leading to bad memory
accesses in the populate_cache() procedure, subsequently causing a
segfault.
Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38999 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target')
| -rw-r--r-- | target/linux/generic/patches-3.10/614-netfilter_arpt_arp_padding_fix.patch | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.10/614-netfilter_arpt_arp_padding_fix.patch b/target/linux/generic/patches-3.10/614-netfilter_arpt_arp_padding_fix.patch new file mode 100644 index 0000000000..70a8d04fa2 --- /dev/null +++ b/target/linux/generic/patches-3.10/614-netfilter_arpt_arp_padding_fix.patch @@ -0,0 +1,16 @@ +--- a/include/uapi/linux/netfilter_arp/arp_tables.h ++++ b/include/uapi/linux/netfilter_arp/arp_tables.h +@@ -68,6 +68,13 @@ struct arpt_arp { + __u8 flags; + /* Inverse flags */ + __u16 invflags; ++ ++ /* For some reason Linaro GCC 4.6-2013.05 omits the two ++ * byte padding here when building for MIPS 34kc, leading to ++ * userspace abi mismatches. ++ * Add a dummy field to align this struct to 4 bytes ++ */ ++ __u16 padding; + }; + + /* Values for "flag" field in struct arpt_ip (general arp structure). |