tree 7a0195643c37c63335224358256fab8cd445a671
parent 5aa3b610a7330c3cd6f0cb264d2189a3a1dcf534
author Al Viro <viro@zeniv.linux.org.uk> 1126142931 -0700
committer Linus Torvalds <torvalds@g5.osdl.org> 1126192451 -0700

[PATCH] Fix 32bit sendmsg() flaw

When we copy 32bit ->msg_control contents to kernel, we walk the same
userland data twice without sanity checks on the second pass.

Second version of this patch: the original broke with 64-bit arches
running 32-bit-compat-mode executables doing sendmsg() syscalls with
unaligned CMSG data areas

Another thing is that we use kmalloc() to allocate and sock_kfree_s()
to free afterwards; less serious, but also needs fixing.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Chris Wright <chrisw@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>