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Hou Tao 7285d16606 bpf: Add map and need_defer parameters to .map_fd_put_ptr() ... [ Upstream commit 20c20bd11a0702ce4dc9300c3da58acf551d9725 ] map is the pointer of outer map, and need_defer needs some explanation. need_defer tells the implementation to defer the reference release of the passed element and ensure that the element is still alive before the bpf program, which may manipulate it, exits. The following three cases will invoke map_fd_put_ptr() and different need_defer values will be passed to these callers: 1) release the reference of the old element in the map during map update or map deletion. The release must be deferred, otherwise the bpf program may incur use-after-free problem, so need_defer needs to be true. 2) release the reference of the to-be-added element in the error path of map update. The to-be-added element is not visible to any bpf program, so it is OK to pass false for need_defer parameter. 3) release the references of all elements in the map during map release. Any bpf program which has access to the map must have been exited and released, so need_defer=false will be OK. These two parameters will be used by the following patches to fix the potential use-after-free problem for map-in-map. Signed-off-by: Hou Tao <houtao1@huawei.com> Link: https://lore.kernel.org/r/20231204140425.1480317-3-houtao@huaweicloud.com Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> (cherry picked from commit 5aa1e7d3f6d0db96c7139677d9e898bbbd6a7dcf) Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>		1 month ago
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acpi	Import A525FXXU3AUG4	3 years ago
asm-generic	locking/barriers: Introduce smp_cond_load_relaxed() and atomic_cond_read_relaxed()	1 year ago
clocksource	arm64: use WFE for long delays	1 month ago
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linux	bpf: Add map and need_defer parameters to .map_fd_put_ptr()	1 month ago
math-emu	Import A525FXXU3AUG4	3 years ago
media	Import A525FXXU3AUG4	3 years ago
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