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f16e80c2c4
To align helper and kfunc pointer to memory argument handling, move kfunc constant memorry size argument handling to the kfunc scalar section. In addition, factor out constant scalar argument handling. The constant size argument (__szk) of a kfunc memory/size pair was recorded into meta->arg_constant by a dedicated block in the KF_ARG_PTR_TO_MEM_SIZE case, duplicating the "only one constant argument" and "must be a known constant" checks already in the generic scalar argument handling. That block also did an explicit i++ to skip the size argument. This also fixes a precision gap: the old dedicated block did not mark the size register precise, relying on check_mem_size_reg() for that. But check_mem_size_reg() is skipped when the buffer is a nullable arg passed as NULL (e.g. bpf_dynptr_slice(_rdwr) with a NULL buffer), so in that case the __szk value was recorded and used for regs[R0].mem_size without marking it precise. Routing the size through the scalar path marks it precise in all cases. Signed-off-by: Amery Hung <ameryhung@gmail.com> Reviewed-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/bpf/20260801074633.1595644-11-ameryhung@gmail.com Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> |
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