linux-arm.git - Russell King's ARM Linux kernel tree

Age	Commit message (Collapse)	Author
2025-01-16	bpf: verifier: Refactor helper access type tracking	Daniel Xu
	Previously, the verifier was treating all PTR_TO_STACK registers passed to a helper call as potentially written to by the helper. However, all calls to check_stack_range_initialized() already have precise access type information available. Rather than treat ACCESS_HELPER as a proxy for BPF_WRITE, pass enum bpf_access_type to check_stack_range_initialized() to more precisely track helper arguments. One benefit from this precision is that registers tracked as valid spills and passed as a read-only helper argument remain tracked after the call. Rather than being marked STACK_MISC afterwards. An additional benefit is the verifier logs are also more precise. For this particular error, users will enjoy a slightly clearer message. See included selftest updates for examples. Acked-by: Eduard Zingerman <eddyz87@gmail.com> Signed-off-by: Daniel Xu <dxu@dxuuu.xyz> Link: https://lore.kernel.org/r/ff885c0e5859e0cd12077c3148ff0754cad4f7ed.1736886479.git.dxu@dxuuu.xyz Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2023-04-21	selftests/bpf: verifier/unpriv converted to inline assembly	Eduard Zingerman
	Test verifier/unpriv semi-automatically converted to use inline assembly. The verifier/unpriv.c had to be split in two parts: - the bulk of the tests is in the progs/verifier_unpriv.c; - the single test that needs `struct bpf_perf_event_data` definition is in the progs/verifier_unpriv_perf.c. The tests above can't be in a single file because: - first requires inclusion of the filter.h header (to get access to BPF_ST_MEM macro, inline assembler does not support this isntruction); - the second requires vmlinux.h, which contains definitions conflicting with filter.h. Signed-off-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/r/20230421174234.2391278-23-eddyz87@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>