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Andrii Nakryiko 3415ec643e libbpf: set BTF FD for prog only when there is supported .BTF.ext data 
5d01ab7bac ("libbpf: fix erroneous multi-closing of BTF FD")
introduced backwards-compatibility issue, manifesting itself as -E2BIG
error returned on program load due to unknown non-zero btf_fd attribute
value for BPF_PROG_LOAD sys_bpf() sub-command.

This patch fixes bug by ensuring that we only ever associate BTF FD with
program if there is a BTF.ext data that was successfully loaded into
kernel, which automatically means kernel supports func_info/line_info
and associated BTF FD for progs (checked and ensured also by BTF
sanitization code).

Fixes: 5d01ab7bac ("libbpf: fix erroneous multi-closing of BTF FD")
Reported-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2019-08-01 13:10:45 -07:00
arch
block
certs
crypto
Documentation mlx5-fixes-2019-07-25 2019-07-26 14:26:41 -07:00
drivers mlx5-fixes-2019-07-25 2019-07-26 14:26:41 -07:00
fs
include mlx5-fixes-2019-07-25 2019-07-26 14:26:41 -07:00
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kernel Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2019-07-25 17:35:03 -07:00
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net ip6_tunnel: fix possible use-after-free on xmit 2019-07-26 14:17:44 -07:00
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tools libbpf: set BTF FD for prog only when there is supported .BTF.ext data 2019-08-01 13:10:45 -07:00
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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.