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author | Daniel T. Lee <danieltimlee@gmail.com> | 2023-08-18 12:01:17 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-09-13 10:42:34 +0300 |
commit | 7984c381bbc1c4522d23a7c08886340376a6c5c5 (patch) | |
tree | eb6bb9b9ceb1bffe799717242303591120f3b060 /drivers | |
parent | c813db76bc1531ae33d9d748ef9d211d802ae580 (diff) | |
download | linux-7984c381bbc1c4522d23a7c08886340376a6c5c5.tar.xz |
samples/bpf: fix broken map lookup probe
[ Upstream commit d93a7cf6ca2cfcd7de5d06f753ce8d5e863316ac ]
In the commit 7c4cd051add3 ("bpf: Fix syscall's stackmap lookup
potential deadlock"), a potential deadlock issue was addressed, which
resulted in *_map_lookup_elem not triggering BPF programs.
(prior to lookup, bpf_disable_instrumentation() is used)
To resolve the broken map lookup probe using "htab_map_lookup_elem",
this commit introduces an alternative approach. Instead, it utilize
"bpf_map_copy_value" and apply a filter specifically for the hash table
with map_type.
Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Fixes: 7c4cd051add3 ("bpf: Fix syscall's stackmap lookup potential deadlock")
Link: https://lore.kernel.org/r/20230818090119.477441-8-danieltimlee@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers')
0 files changed, 0 insertions, 0 deletions