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Filename	Latest commit message	Latest commit date
KP Singh 3dd02da823 BACKPORT: bpf: Introduce BPF_MODIFY_RETURN ... When multiple programs are attached, each program receives the return value from the previous program on the stack and the last program provides the return value to the attached function. The fmod_ret bpf programs are run after the fentry programs and before the fexit programs. The original function is only called if all the fmod_ret programs return 0 to avoid any unintended side-effects. The success value, i.e. 0 is not currently configurable but can be made so where user-space can specify it at load time. For example: int func_to_be_attached(int a, int b) { <--- do_fentry do_fmod_ret: <update ret by calling fmod_ret> if (ret != 0) goto do_fexit; original_function: <side_effects_happen_here> } <--- do_fexit The fmod_ret program attached to this function can be defined as: SEC("fmod_ret/func_to_be_attached") int BPF_PROG(func_name, int a, int b, int ret) { // This will skip the original function logic. return 1; } The first fmod_ret program is passed 0 in its return argument. Change-Id: I87497d54c8da6278bf89dc9aed0d6453bd72ca29 Signed-off-by: KP Singh <kpsingh@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20200304191853.1529-4-kpsingh@chromium.org		2025-12-23 13:36:01 -08:00
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asm-generic	BACKPORT: epoll: wire up syscall epoll_pwait2	2025-12-22 07:42:50 +02:00
drm
linux	BACKPORT: bpf: Introduce BPF_MODIFY_RETURN	2025-12-23 13:36:01 -08:00
media
misc
mtd
rdma
scsi
sound	Merge android11-5.4.249+ (d57e792) into msm-5.4	2023-09-28 16:45:28 +05:30
video
xen
Kbuild