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authorAl Viro <viro@zeniv.linux.org.uk>2005-09-07 18:28:51 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-08 08:14:11 -0700
commit8920e8f94c44e31a73bdf923b04721e26e88cadd (patch)
tree7a0195643c37c63335224358256fab8cd445a671 /net/socket.c
parent5aa3b610a7330c3cd6f0cb264d2189a3a1dcf534 (diff)
[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>
Diffstat (limited to 'net/socket.c')
-rw-r--r--net/socket.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/socket.c b/net/socket.c
index e1bd5d84d7bf..c699e93c33d7 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1745,10 +1745,11 @@ asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
goto out_freeiov;
ctl_len = msg_sys.msg_controllen;
if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
- err = cmsghdr_from_user_compat_to_kern(&msg_sys, ctl, sizeof(ctl));
+ err = cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl, sizeof(ctl));
if (err)
goto out_freeiov;
ctl_buf = msg_sys.msg_control;
+ ctl_len = msg_sys.msg_controllen;
} else if (ctl_len) {
if (ctl_len > sizeof(ctl))
{

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