bb986a5042
The seg6_validate_srh() is used to validate SRH for three cases: case1: SRH of data-plane SRv6 packets to be processed by the Linux kernel. Case2: SRH of the netlink message received from user-space (iproute2) Case3: SRH injected into packets through setsockopt In case1, the SRH can be encoded in the Reduced way (i.e., first SID is carried in DA only and not represented as SID in the SRH) and the seg6_validate_srh() now handles this case correctly. In case2 and case3, the SRH shouldn’t be encoded in the Reduced way otherwise we lose the first segment (i.e., the first hop). The current implementation of the seg6_validate_srh() allow SRH of case2 and case3 to be encoded in the Reduced way. This leads a slab-out-of-bounds problem. This patch verifies SRH of case1, case2 and case3. Allowing case1 to be reduced while preventing SRH of case2 and case3 from being reduced . Reported-by: syzbot+e8c028b62439eac42073@syzkaller.appspotmail.com Reported-by: YueHaibing <yuehaibing@huawei.com> Fixes: 0cb7498f234e ("seg6: fix SRH processing to comply with RFC8754") Signed-off-by: Ahmed Abdelsalam <ahabdels@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.