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Yonghong Song ac4e0e055f tools/bpftool: move set_max_rlimit() before __bpf_object__open_xattr() 
For a host which has a lower rlimit for max locked memory (e.g., 64KB),
the following error occurs in one of our production systems:
  # /usr/sbin/bpftool prog load /paragon/pods/52877437/home/mark.o \
    /sys/fs/bpf/paragon_mark_21 type cgroup/skb \
    map idx 0 pinned /sys/fs/bpf/paragon_map_21
  libbpf: Error in bpf_object__probe_name():Operation not permitted(1).
    Couldn't load basic 'r0 = 0' BPF program.
  Error: failed to open object file

The reason is due to low locked memory during bpf_object__probe_name()
which probes whether program name is supported in kernel or not
during __bpf_object__open_xattr().

bpftool program load already tries to relax mlock rlimit before
bpf_object__load(). Let us move set_max_rlimit() before
__bpf_object__open_xattr(), which fixed the issue here.

Fixes: 47eff61777 ("bpf, libbpf: introduce bpf_object__probe_caps to test BPF capabilities")
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2019-05-16 11:44:50 -07:00
arch Merge branch 'parisc-5.2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux 2019-05-14 13:17:19 -07:00
block
certs
crypto
Documentation Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2019-05-15 18:28:44 -07:00
drivers enetc: Add missing link state info for ethtool 2019-05-15 09:14:29 -07:00
fs
include rhashtable: Remove RCU marking from rhash_lock_head 2019-05-16 09:45:20 -07:00
init
ipc
kernel bpf: relax inode permission check for retrieving bpf program 2019-05-16 11:31:49 -07:00
lib rhashtable: Fix cmpxchg RCU warnings 2019-05-16 09:45:20 -07:00
LICENSES
mm
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2019-05-15 18:28:44 -07:00
samples Add gitignore file for samples/vfs/ generated files 2019-05-14 13:30:10 -07:00
scripts
security
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tools tools/bpftool: move set_max_rlimit() before __bpf_object__open_xattr() 2019-05-16 11:44:50 -07:00
usr
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MAINTAINERS NFC: Orphan the subsystem 2019-05-14 15:31:47 -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.