selftests/bpf: Validate frozen map contents stays frozen
authorAndrii Nakryiko <andriin@fb.com>
Fri, 10 Apr 2020 20:26:13 +0000 (13:26 -0700)
committerDaniel Borkmann <daniel@iogearbox.net>
Tue, 14 Apr 2020 19:28:57 +0000 (21:28 +0200)
commit642c1654702731ab42a3be771bebbd6ef938f0dc
tree766a7490a2cdb507523f1369f73ec902fb699e85
parent1f6cb19be2e231fe092f40decb71f066eba090d7
selftests/bpf: Validate frozen map contents stays frozen

Test that frozen and mmap()'ed BPF map can't be mprotect()'ed as writable or
executable memory. Also validate that "downgrading" from writable to read-only
doesn't screw up internal writable count accounting for the purposes of map
freezing.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200410202613.3679837-2-andriin@fb.com
tools/testing/selftests/bpf/prog_tests/mmap.c