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Filename Latest commit message Latest commit date
Daniel Borkmann d8fd9e106f bpf: fix wrong helper enablement in cgroup local storage 
Commit cd33943176 ("bpf: introduce the bpf_get_local_storage()
helper function") enabled the bpf_get_local_storage() helper also
for BPF program types where it does not make sense to use them.

They have been added both in sk_skb_func_proto() and sk_msg_func_proto()
even though both program types are not invoked in combination with
cgroups, and neither through BPF_PROG_RUN_ARRAY(). In the latter the
bpf_cgroup_storage_set() is set shortly before BPF program invocation.

Later, the helper bpf_get_local_storage() retrieves this prior set
up per-cpu pointer and hands the buffer to the BPF program. The map
argument in there solely retrieves the enum bpf_cgroup_storage_type
from a local storage map associated with the program and based on the
type returns either the global or per-cpu storage. However, there
is no specific association between the program's map and the actual
content in bpf_cgroup_storage[].

Meaning, any BPF program that would have been properly run from the
cgroup side through BPF_PROG_RUN_ARRAY() where bpf_cgroup_storage_set()
was performed, and that is later unloaded such that prog / maps are
teared down will cause a use after free if that pointer is retrieved
from programs that are not run through BPF_PROG_RUN_ARRAY() but have
the cgroup local storage helper enabled in their func proto.

Lets just remove it from the two sock_map program types to fix it.
Auditing through the types where this helper is enabled, it appears
that these are the only ones where it was mistakenly allowed.

Fixes: cd33943176 ("bpf: introduce the bpf_get_local_storage() helper function")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Roman Gushchin <guro@fb.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-10-26 16:03:30 -07:00
arch Merge branch 'work.tty-ioctl' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2018-10-24 14:43:41 +01:00
block
certs
crypto Revert "net: simplify sock_poll_wait" 2018-10-23 10:57:06 -07:00
Documentation bpf: add bpf_jit_limit knob to restrict unpriv allocations 2018-10-25 17:11:42 -07:00
drivers octeontx2-af: Use GFP_ATOMIC under spin lock 2018-10-25 11:36:29 -07:00
firmware
fs Further restructure ext4 documentation; fix up ext4's delayed 2018-10-24 17:42:24 +01:00
include bpf: add bpf_jit_limit knob to restrict unpriv allocations 2018-10-25 17:11:42 -07:00
init Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-10-23 15:00:03 +01:00
ipc Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2018-10-24 11:22:39 +01:00
kernel bpf: add bpf_jit_limit knob to restrict unpriv allocations 2018-10-25 17:11:42 -07:00
lib This is a fairly typical cycle for documentation. There's some welcome 2018-10-24 18:01:11 +01:00
LICENSES This is a fairly typical cycle for documentation. There's some welcome 2018-10-24 18:01:11 +01:00
mm Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2018-10-24 11:22:39 +01:00
net bpf: fix wrong helper enablement in cgroup local storage 2018-10-26 16:03:30 -07:00
samples
scripts This is a fairly typical cycle for documentation. There's some welcome 2018-10-24 18:01:11 +01:00
security Merge branch 'next-general' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2018-10-24 11:49:35 +01:00
sound Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-10-23 13:32:18 +01:00
tools bpf: disallow direct packet access for unpriv in cg_skb 2018-10-25 17:02:06 -07:00
usr
virt Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2018-10-24 11:22:39 +01:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS This is a fairly typical cycle for documentation. There's some welcome 2018-10-24 18:01:11 +01:00
Makefile Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-10-23 13:08:53 +01:00
README

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 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.