mirror of https://github.com/torvalds/linux.git
7a433e5193
Previously, the verifier only tracked positive constant deltas between linked registers using BPF_ADD. This limitation meant patterns like: r1 = r0; r1 += -4; if r1 s>= 0 goto l0_%=; // r1 >= 0 implies r0 >= 4 // verifier couldn't propagate bounds back to r0 if r0 != 0 goto l0_%=; r0 /= 0; // Verifier thinks this is reachable l0_%=: Similar limitation exists for 32-bit registers. With this change, the verifier can now track negative deltas in reg->off enabling bound propagation for the above pattern. For alu32, we make sure the destination register has the upper 32 bits as 0s before creating the link. BPF_ADD_CONST is split into BPF_ADD_CONST64 and BPF_ADD_CONST32, the latter is used in case of alu32 and sync_linked_regs uses this to zext the result if known_reg has this flag. Signed-off-by: Puranjay Mohan <puranjay@kernel.org> Acked-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/r/20260204151741.2678118-2-puranjay@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org> |
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| .. | ||
| preload | ||
| Kconfig | ||
| Makefile | ||
| arena.c | ||
| arraymap.c | ||
| bloom_filter.c | ||
| bpf_cgrp_storage.c | ||
| bpf_inode_storage.c | ||
| bpf_insn_array.c | ||
| bpf_iter.c | ||
| bpf_local_storage.c | ||
| bpf_lru_list.c | ||
| bpf_lru_list.h | ||
| bpf_lsm.c | ||
| bpf_lsm_proto.c | ||
| bpf_struct_ops.c | ||
| bpf_task_storage.c | ||
| btf.c | ||
| btf_iter.c | ||
| btf_relocate.c | ||
| cgroup.c | ||
| cgroup_iter.c | ||
| core.c | ||
| cpumap.c | ||
| cpumask.c | ||
| crypto.c | ||
| devmap.c | ||
| disasm.c | ||
| disasm.h | ||
| dispatcher.c | ||
| dmabuf_iter.c | ||
| hashtab.c | ||
| helpers.c | ||
| inode.c | ||
| kmem_cache_iter.c | ||
| link_iter.c | ||
| liveness.c | ||
| local_storage.c | ||
| log.c | ||
| lpm_trie.c | ||
| 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 | ||
| range_tree.c | ||
| range_tree.h | ||
| relo_core.c | ||
| reuseport_array.c | ||
| ringbuf.c | ||
| rqspinlock.c | ||
| rqspinlock.h | ||
| stackmap.c | ||
| stream.c | ||
| syscall.c | ||
| sysfs_btf.c | ||
| task_iter.c | ||
| tcx.c | ||
| tnum.c | ||
| token.c | ||
| trampoline.c | ||
| verifier.c | ||