Ilya Leoshkevich a192103a11 s390/bpf: Pass through tail call counter in trampolines ... s390x eBPF programs use the following extension to the s390x calling convention: tail call counter is passed on stack at offset STK_OFF_TCCNT, which callees otherwise use as scratch space. Currently trampoline does not respect this and clobbers tail call counter. This breaks enforcing tail call limits in eBPF programs, which have trampolines attached to them. Fix by forwarding a copy of the tail call counter to the original eBPF program in the trampoline (for fexit), and by restoring it at the end of the trampoline (for fentry). Fixes: 528eb2cb87 ("s390/bpf: Implement arch_prepare_bpf_trampoline()") Reported-by: Leon Hwang <hffilwlqm@gmail.com> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20230906004448.111674-1-iii@linux.ibm.com		2023-09-06 10:48:14 +02:00
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Makefile	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2018-06-06 18:39:49 -07:00
bpf_jit.h	bpf, s390x: remove ld_abs/ld_ind	2018-05-03 16:49:20 -07:00
bpf_jit_comp.c	s390/bpf: Pass through tail call counter in trampolines	2023-09-06 10:48:14 +02:00
pnet.c	s390/net: convert pnetids to ascii	2019-02-21 10:34:37 -08:00