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6899b32b5b
Running bpf programs requires disabled preemption, however at least some* of the BPF_PROG_RUN_ARRAY users do not follow this rule. To fix this bug, and also to make it not happen in the future, let's add explicit preemption disabling/re-enabling to the __BPF_PROG_RUN_ARRAY code. * for example: [ 17.624472] RIP: 0010:__cgroup_bpf_run_filter_sk+0x1c4/0x1d0 ... [ 17.640890] inet6_create+0x3eb/0x520 [ 17.641405] __sock_create+0x242/0x340 [ 17.641939] __sys_socket+0x57/0xe0 [ 17.642370] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 17.642944] SyS_socket+0xa/0x10 [ 17.643357] do_syscall_64+0x79/0x220 [ 17.643879] entry_SYSCALL_64_after_hwframe+0x42/0xb7 Signed-off-by: Roman Gushchin <guro@fb.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> |
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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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.