mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/
synced 2026-11-06 18:57:23 +00:00
No description
- C 96.8%
- Assembly 0.9%
- Rust 0.7%
- Shell 0.6%
- Python 0.5%
- Other 0.3%
fd4e41ebf6
When the active link is changed for a bond device, the existing xfrm
states need to be migrated over to the new link. This is done with:
- bond_ipsec_del_sa_all() goes through the offloaded states list and
removes all of them from hw.
- bond_ipsec_add_sa_all() re-offloads all states to the new device.
But because the offload status of xfrm states isn't marked in any way,
there can be bugs.
When all bond links are down, bond_ipsec_del_sa_all() unoffloads
everything from the previous active link. If the same link then comes
back up, nothing gets reoffloaded by bond_ipsec_add_sa_all().
This results in a stack trace like this a bit later when user space
removes the offloaded rules, because mlx5e_xfrm_del_state() is asked to
remove a rule that's no longer offloaded:
[] Call Trace:
[] <TASK>
[] ? __warn+0x7d/0x110
[] ? mlx5e_xfrm_del_state+0x90/0xa0 [mlx5_core]
[] ? report_bug+0x16d/0x180
[] ? handle_bug+0x4f/0x90
[] ? exc_invalid_op+0x14/0x70
[] ? asm_exc_invalid_op+0x16/0x20
[] ? mlx5e_xfrm_del_state+0x73/0xa0 [mlx5_core]
[] ? mlx5e_xfrm_del_state+0x90/0xa0 [mlx5_core]
[] bond_ipsec_del_sa+0x1ab/0x200 [bonding]
[] xfrm_dev_state_delete+0x1f/0x60
[] __xfrm_state_delete+0x196/0x200
[] xfrm_state_delete+0x21/0x40
[] xfrm_del_sa+0x69/0x110
[] xfrm_user_rcv_msg+0x11d/0x300
[] ? release_pages+0xca/0x140
[] ? copy_to_user_tmpl.part.0+0x110/0x110
[] netlink_rcv_skb+0x54/0x100
[] xfrm_netlink_rcv+0x31/0x40
[] netlink_unicast+0x1fc/0x2d0
[] netlink_sendmsg+0x1e4/0x410
[] __sock_sendmsg+0x38/0x60
[] sock_write_iter+0x94/0xf0
[] vfs_write+0x338/0x3f0
[] ksys_write+0xba/0xd0
[] do_syscall_64+0x4c/0x100
[] entry_SYSCALL_64_after_hwframe+0x4b/0x53
There's also another theoretical bug:
Calling bond_ipsec_del_sa_all() multiple times can result in corruption
in the driver implementation if the double-free isn't tolerated. This
isn't nice.
Before the "Fixes" commit, xs->xso.real_dev was set to NULL when an xfrm
state was unoffloaded from a device, but a race with netdevsim's
.xdo_dev_offload_ok() accessing real_dev was considered a sufficient
reason to not set real_dev to NULL anymore. This unfortunately
introduced the new bugs.
Since .xdo_dev_offload_ok() was significantly refactored by [1] and
there are no more users in the stack of xso.real_dev, that
race is now gone and xs->xso.real_dev can now once again be used to
represent which device (if any) currently holds the offloaded rule.
Go one step further and set real_dev after add/before delete calls, to
catch any future driver misuses of real_dev.
[1] https://lore.kernel.org/netdev/cover.1739972570.git.leon@kernel.org/
Fixes:
|
History
|
|
|---|---|---|
| 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 | ||
| .clippy.toml | ||
| .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.