selftests/bpf: Test modified syscall ctx for ARG_PTR_TO_CTX

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Ensure that global subprogs and tail calls can only accept an unmodified
PTR_TO_CTX for syscall programs. For all other program types, fixed or
variable offsets on PTR_TO_CTX is rejected when passed into an argument
of any call instruction type, through the unified logic of
check_func_arg_reg_off.

Finally, add a positive example of a case that should succeed with all
our previous changes.

Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Acked-by: Puranjay Mohan <puranjay@kernel.org>
Acked-by: Mykyta Yatsenko <yatsenko@meta.com>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260406194403.1649608-6-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Kumar Kartikeya Dwivedi 2026-04-06 21:43:59 +02:00 • committed by Alexei Starovoitov

parent 5a34139b27

commit 02c68b10d8

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tools/testing/selftests/bpf/progs/verifier_global_subprogs.c

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