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Daniel Borkmann b9b34ddbe2 bpf: Fix masking negation logic upon negative dst register 
The negation logic for the case where the off_reg is sitting in the
dst register is not correct given then we cannot just invert the add
to a sub or vice versa. As a fix, perform the final bitwise and-op
unconditionally into AX from the off_reg, then move the pointer from
the src to dst and finally use AX as the source for the original
pointer arithmetic operation such that the inversion yields a correct
result. The single non-AX mov in between is possible given constant
blinding is retaining it as it's not an immediate based operation.

Fixes: 979d63d50c ("bpf: prevent out of bounds speculation on pointer arithmetic")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: Piotr Krysiuk <piotras@gmail.com>
Reviewed-by: Piotr Krysiuk <piotras@gmail.com>
Reviewed-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
2021-05-03 11:56:16 +02:00
arch Networking changes for 5.13. 2021-04-29 11:57:23 -07:00
block
certs
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Documentation Networking changes for 5.13. 2021-04-29 11:57:23 -07:00
drivers net: dsa: ksz: ksz8863_smi_probe: set proper return value for ksz_switch_alloc() 2021-04-29 15:54:35 -07:00
fs Networking changes for 5.13. 2021-04-29 11:57:23 -07:00
include seg6: add counters support for SRv6 Behaviors 2021-04-29 15:26:57 -07:00
init Networking changes for 5.13. 2021-04-29 11:57:23 -07:00
ipc
kernel bpf: Fix masking negation logic upon negative dst register 2021-05-03 11:56:16 +02:00
lib Networking changes for 5.13. 2021-04-29 11:57:23 -07:00
LICENSES
mm
net net: Remove redundant assignment to err 2021-04-29 15:34:15 -07:00
samples Networking changes for 5.13. 2021-04-29 11:57:23 -07:00
scripts Networking changes for 5.13. 2021-04-29 11:57:23 -07:00
security Networking changes for 5.13. 2021-04-29 11:57:23 -07:00
sound
tools selftests/bpf: Fix the snprintf test 2021-04-30 10:36:59 -07:00
usr
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COPYING
CREDITS MAINTAINERS: move Murali Karicheri to credits 2021-04-29 15:47:30 -07:00
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MAINTAINERS MAINTAINERS: move Murali Karicheri to credits 2021-04-29 15:47:30 -07:00
Makefile
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.