bpf: Fix an error around PTR_UNTRUSTED

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[ Upstream commit 7ce4dc3e4a ]

Per discussion with Alexei, the PTR_UNTRUSTED flag should not been
cleared when we start to walk a new struct, because the struct in
question may be a struct nested in a union. We should also check and set
this flag before we walk its each member, in case itself is a union.
We will clear this flag if the field is BTF_TYPE_SAFE_RCU_OR_NULL.

Fixes: 6fcd486b3a ("bpf: Refactor RCU enforcement in the verifier.")
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Link: https://lore.kernel.org/r/20230713025642.27477-2-laoar.shao@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Yafang Shao 2023-07-13 02:56:39 +00:00 • committed by Greg Kroah-Hartman

parent 62c4571f27

commit a613170053

2 changed files with 14 additions and 11 deletions

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20

kernel/bpf/btf.c

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5

kernel/bpf/verifier.c

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