Yonghong Song 8482941f09 bpf: Add bpf_send_signal_thread() helper ... Commit 8b401f9ed2 ("bpf: implement bpf_send_signal() helper") added helper bpf_send_signal() which permits bpf program to send a signal to the current process. The signal may be delivered to any threads in the process. We found a use case where sending the signal to the current thread is more preferable. - A bpf program will collect the stack trace and then send signal to the user application. - The user application will add some thread specific information to the just collected stack trace for later analysis. If bpf_send_signal() is used, user application will need to check whether the thread receiving the signal matches the thread collecting the stack by checking thread id. If not, it will need to send signal to another thread through pthread_kill(). This patch proposed a new helper bpf_send_signal_thread(), which sends the signal to the thread corresponding to the current kernel task. This way, user space is guaranteed that bpf_program execution context and user space signal handling context are the same thread. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200115035002.602336-1-yhs@fb.com		2020-01-15 11:44:51 -08:00
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asm	riscv, bpf: Add missing uapi header for BPF_PROG_TYPE_PERF_EVENT programs	2019-12-19 16:03:31 +01:00
asm-generic	tools headers uapi: Sync asm-generic/mman-common.h with the kernel	2019-09-30 17:28:44 -03:00
drm	tools headers UAPI: Update tools's copy of drm.h headers	2019-12-04 16:22:38 -03:00
linux	bpf: Add bpf_send_signal_thread() helper	2020-01-15 11:44:51 -08:00
sound	tools include uapi: Sync sound/asound.h copy	2019-04-16 12:36:20 -03:00