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6fceea0fa5
Allow transferring an imbalanced RCU lock state between subprog calls during verification. This allows patterns where a subprog call returns with an RCU lock held, or a subprog call releases an RCU lock held by the caller. Currently, the verifier would end up complaining if the RCU lock is not released when processing an exit from a subprog, which is non-ideal if its execution is supposed to be enclosed in an RCU read section of the caller. Instead, simply only check whether we are processing exit for frame#0 and do not complain on an active RCU lock otherwise. We only need to update the check when processing BPF_EXIT insn, as copy_verifier_state is already set up to do the right thing. Suggested-by: David Vernet <void@manifault.com> Tested-by: Yafang Shao <laoar.shao@gmail.com> Acked-by: Yonghong Song <yonghong.song@linux.dev> Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Acked-by: David Vernet <void@manifault.com> Link: https://lore.kernel.org/r/20240205055646.1112186-2-memxor@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org> |
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| .. | ||
| preload | ||
| arraymap.c | ||
| bloom_filter.c | ||
| bpf_cgrp_storage.c | ||
| bpf_inode_storage.c | ||
| bpf_iter.c | ||
| bpf_local_storage.c | ||
| bpf_lru_list.c | ||
| bpf_lru_list.h | ||
| bpf_lsm.c | ||
| bpf_struct_ops.c | ||
| bpf_task_storage.c | ||
| btf.c | ||
| cgroup_iter.c | ||
| cgroup.c | ||
| core.c | ||
| cpumap.c | ||
| cpumask.c | ||
| devmap.c | ||
| disasm.c | ||
| disasm.h | ||
| dispatcher.c | ||
| hashtab.c | ||
| helpers.c | ||
| inode.c | ||
| Kconfig | ||
| link_iter.c | ||
| local_storage.c | ||
| log.c | ||
| lpm_trie.c | ||
| Makefile | ||
| map_in_map.c | ||
| map_in_map.h | ||
| map_iter.c | ||
| memalloc.c | ||
| mmap_unlock_work.h | ||
| mprog.c | ||
| net_namespace.c | ||
| offload.c | ||
| percpu_freelist.c | ||
| percpu_freelist.h | ||
| prog_iter.c | ||
| queue_stack_maps.c | ||
| reuseport_array.c | ||
| ringbuf.c | ||
| stackmap.c | ||
| syscall.c | ||
| sysfs_btf.c | ||
| task_iter.c | ||
| tcx.c | ||
| tnum.c | ||
| token.c | ||
| trampoline.c | ||
| verifier.c | ||