mirror of
https://github.com/torvalds/linux
synced 2024-07-08 20:29:39 +00:00
be008726d0
Syzkaller was able to trigger
kernel BUG at net/core/gro.c:424 !
RIP: 0010:gro_pull_from_frag0 net/core/gro.c:424 [inline]
RIP: 0010:gro_try_pull_from_frag0 net/core/gro.c:446 [inline]
RIP: 0010:dev_gro_receive+0x242f/0x24b0 net/core/gro.c:571
Due to using an incorrect NAPI_GRO_CB(skb)->network_offset.
The referenced commit sets this offset to 0 in skb_gro_reset_offset.
That matches the expected case in dev_gro_receive:
pp = INDIRECT_CALL_INET(ptype->callbacks.gro_receive,
ipv6_gro_receive, inet_gro_receive,
&gro_list->list, skb);
But syzkaller injected an skb with protocol ETH_P_TEB into an ip6gre
device (by writing the IP6GRE encapsulated version to a TAP device).
The result was a first call to eth_gro_receive, and thus an extra
ETH_HLEN in network_offset that should not be there. First issue hit
is when computing offset from network header in ipv6_gro_pull_exthdrs.
Initialize both offsets in the network layer gro_receive.
This pairs with all reads in gro_receive, which use
skb_gro_receive_network_offset().
Fixes:
|
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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 reStructuredText 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.