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Verify that the length of the socket buffer is sufficient to cover the nlmsghdr structure before accessing the nlh->nlmsg_len field for further input sanitization. If the client only supplies 1-3 bytes of data in sk_buff, then nlh->nlmsg_len remains partially uninitialized and contains leftover memory from the corresponding kernel allocation. Operating on such data may result in indeterminate evaluation of the nlmsg_len < sizeof(*nlh) expression. The bug was discovered by a runtime instrumentation designed to detect use of uninitialized memory in the kernel. The patch prevents this and other similar tools (e.g. KMSAN) from flagging this behavior in the future. Signed-off-by: Mateusz Jurczyk <mjurczyk@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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|---|---|---|
| .. | ||
| netfilter | ||
| af_decnet.c | ||
| dn_dev.c | ||
| dn_fib.c | ||
| dn_neigh.c | ||
| dn_nsp_in.c | ||
| dn_nsp_out.c | ||
| dn_route.c | ||
| dn_rules.c | ||
| dn_table.c | ||
| dn_timer.c | ||
| Kconfig | ||
| Makefile | ||
| README | ||
| sysctl_net_decnet.c | ||
| TODO | ||
Linux DECnet Project
======================
The documentation for this kernel subsystem is available in the
Documentation/networking subdirectory of this distribution and also
on line at http://www.chygwyn.com/DECnet/
Steve Whitehouse <SteveW@ACM.org>