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authorDavid Windsor <dave@nullcore.net>2017-08-24 16:49:14 -0700
committerKees Cook <keescook@chromium.org>2018-01-15 12:07:59 -0800
commit8c2bc895a9347846b33c47124a75db624aa83677 (patch)
tree1bad27c8f27e0212c8fec2c66954d177d28455d9 /drivers/gpio/gpiolib.h
parentnet: Define usercopy region in struct proto slab cache (diff)
downloadlinux-dev-8c2bc895a9347846b33c47124a75db624aa83677.tar.xz
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ip: Define usercopy region in IP proto slab cache
The ICMP filters for IPv4 and IPv6 raw sockets need to be copied to/from userspace. In support of usercopy hardening, this patch defines a region in the struct proto slab cache in which userspace copy operations are allowed. example usage trace: net/ipv4/raw.c: raw_seticmpfilter(...): ... copy_from_user(&raw_sk(sk)->filter, ..., optlen) raw_geticmpfilter(...): ... copy_to_user(..., &raw_sk(sk)->filter, len) net/ipv6/raw.c: rawv6_seticmpfilter(...): ... copy_from_user(&raw6_sk(sk)->filter, ..., optlen) rawv6_geticmpfilter(...): ... copy_to_user(..., &raw6_sk(sk)->filter, len) This region is known as the slab cache's usercopy region. Slab caches can now check that each dynamically sized copy operation involving cache-managed memory falls entirely within the slab's usercopy region. This patch is modified from Brad Spengler/PaX Team's PAX_USERCOPY whitelisting code in the last public patch of grsecurity/PaX based on my understanding of the code. Changes or omissions from the original code are mine and don't reflect the original grsecurity/PaX code. Signed-off-by: David Windsor <dave@nullcore.net> [kees: split from network patch, provide usage trace] Cc: "David S. Miller" <davem@davemloft.net> Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org> Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org>
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