FEX-Emu/linux
1
0
Fork 0
mirror of https://github.com/FEX-Emu/linux.git synced 2024-12-15 21:30:43 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
Linux kernel source tree
836,399 Commits 2 Branches 693 Tags 3.5 GiB
C 97.7%
Assembly 1.2%
Shell 0.4%
Makefile 0.3%
Python 0.2%
Other 0.1%
e2f7fc0ac6
Go to file
Krzesimir Nowak e2f7fc0ac6 bpf: fix undefined behavior in narrow load handling 
Commit 31fd85816d ("bpf: permits narrower load from bpf program
context fields") made the verifier add AND instructions to clear the
unwanted bits with a mask when doing a narrow load. The mask is
computed with

  (1 << size * 8) - 1

where "size" is the size of the narrow load. When doing a 4 byte load
of a an 8 byte field the verifier shifts the literal 1 by 32 places to
the left. This results in an overflow of a signed integer, which is an
undefined behavior. Typically, the computed mask was zero, so the
result of the narrow load ended up being zero too.

Cast the literal to long long to avoid overflows. Note that narrow
load of the 4 byte fields does not have the undefined behavior,
because the load size can only be either 1 or 2 bytes, so shifting 1
by 8 or 16 places will not overflow it. And reading 4 bytes would not
be a narrow load of a 4 bytes field.

Fixes: 31fd85816d ("bpf: permits narrower load from bpf program context fields")
Reviewed-by: Alban Crequy <alban@kinvolk.io>
Reviewed-by: Iago López Galeiras <iago@kinvolk.io>
Signed-off-by: Krzesimir Nowak <krzesimir@kinvolk.io>
Cc: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-05-13 02:05:50 +02:00
arch powerpc: tsi108: fix similar warning reported by kbuild test robot 2019-05-10 15:14:29 -07:00
block for-5.2/block-20190507 2019-05-07 18:14:36 -07:00
certs kexec, KEYS: Make use of platform keyring for signature verify 2019-02-04 17:34:07 -05:00
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2019-05-07 22:03:58 -07:00
Documentation dt-bindings: doc: net: remove Linux API references 2019-05-10 15:14:29 -07:00
drivers net: phy: realtek: add missing page operations 2019-05-10 15:20:59 -07:00
fs Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-05-09 19:35:41 -07:00
include bpf: fix minor issues in documentation for BPF helpers. 2019-05-13 01:12:45 +02:00
init Initialize the random driver earler; fix CRNG initialization when we 2019-05-07 21:42:23 -07:00
ipc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2019-05-07 22:03:58 -07:00
kernel bpf: fix undefined behavior in narrow load handling 2019-05-13 02:05:50 +02:00
lib 5.2 Merge Window pull request 2019-05-09 09:02:46 -07:00
LICENSES LICENSES: Rename other to deprecated 2019-05-03 06:34:32 -06:00
mm Merge branch 'work.icache' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-05-07 10:57:05 -07:00
net dsa: tag_brcm: Fix build error without CONFIG_NET_DSA_TAG_BRCM_PREPEND 2019-05-10 15:06:45 -07:00
samples 5.2 Merge Window pull request 2019-05-09 09:02:46 -07:00
scripts bpf: fix script for generating man page on BPF helpers 2019-05-13 01:12:45 +02:00
security Revert "selinux: do not report error on connect(AF_UNSPEC)" 2019-05-10 09:34:31 -07:00
sound sound updates for 5.2-rc1 2019-05-09 08:26:55 -07:00
tools libbpf: detect supported kernel BTF features and sanitize BTF 2019-05-13 01:31:20 +02:00
usr user/Makefile: Fix typo and capitalization in comment section 2018-12-11 00:18:03 +09:00
virt arm64 updates for 5.2 2019-05-06 17:54:22 -07:00
.clang-format Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-04-17 11:26:25 -07:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore .gitignore: add more all*.config patterns 2019-05-08 09:47:46 +09:00
.mailmap A reasonably busy cycle for docs, including: 2019-05-08 12:42:50 -07:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS Char/Misc driver patches for 5.1-rc1 2019-03-06 14:18:59 -08:00
Kbuild Kbuild updates for v5.1 2019-03-10 17:48:21 -07:00
Kconfig kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt 2018-08-02 08:06:55 +09:00
MAINTAINERS powerpc updates for 5.2 2019-05-10 05:29:27 -07:00
Makefile Kbuild updates for v5.2 2019-05-08 12:25:12 -07:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

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.