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Maciej Żenczykowski 5dec6d96d1 bpf: Fix regression on BPF_OBJ_GET with non-O_RDWR flags 
This reverts commit d37300ed18 ("bpf: program: Refuse non-O_RDWR flags
in BPF_OBJ_GET"). It breaks Android userspace which expects to be able to
fetch programs with just read permissions.

See: https://cs.android.com/android/platform/superproject/+/master:frameworks/libs/net/common/native/bpf_syscall_wrappers/include/BpfSyscallWrappers.h;drc=7005c764be23d31fa1d69e826b4a2f6689a8c81e;l=124

Side-note: another option to fix it would be to extend bpf_prog_new_fd()
and to pass in used file mode flags in the same way as we do for maps via
bpf_map_new_fd(). Meaning, they'd end up in anon_inode_getfd() and thus
would be retained for prog fd operations with bpf() syscall. Right now
these flags are not checked with progs since they are immutable for their
lifetime (as opposed to maps which can be updated from user space). In
future this could potentially change with new features, but at that point
it's still fine to do the bpf_prog_new_fd() extension when needed. For a
simple stable fix, a revert is less churn.

Fixes: d37300ed18 ("bpf: program: Refuse non-O_RDWR flags in BPF_OBJ_GET")
Signed-off-by: Maciej Żenczykowski <maze@google.com>
[ Daniel: added side-note to commit message ]
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Lorenz Bauer <lmb@cloudflare.com>
Acked-by: Greg Kroah-Hartman <gregkh@google.com>
Link: https://lore.kernel.org/bpf/20210618105526.265003-1-zenczykowski@gmail.com
2021-06-22 14:57:43 +02:00
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include skmsg: Improve udp_bpf_recvmsg() accuracy 2021-06-21 16:48:11 +02:00
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kernel bpf: Fix regression on BPF_OBJ_GET with non-O_RDWR flags 2021-06-22 14:57:43 +02:00
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tools selftests/bpf: Retry for EAGAIN in udp_redir_to_connected() 2021-06-21 16:48:21 +02:00
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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.