* [PATCH v3] bpf: Fix unsigned 'datasec_id' compared with zero in check_pseudo_btf_id
@ 2020-11-11 5:03 xiakaixu1987
2020-11-11 5:13 ` Andrii Nakryiko
2020-11-11 10:07 ` Daniel Borkmann
0 siblings, 2 replies; 4+ messages in thread
From: xiakaixu1987 @ 2020-11-11 5:03 UTC (permalink / raw)
To: ast, daniel, kafai, songliubraving, yhs, andrii, john.fastabend, kpsingh
Cc: netdev, bpf, linux-kernel, Kaixu Xia
From: Kaixu Xia <kaixuxia@tencent.com>
The unsigned variable datasec_id is assigned a return value from the call
to check_pseudo_btf_id(), which may return negative error code.
Fixes coccicheck warning:
./kernel/bpf/verifier.c:9616:5-15: WARNING: Unsigned expression compared with zero: datasec_id > 0
Reported-by: Tosk Robot <tencent_os_robot@tencent.com>
Signed-off-by: Kaixu Xia <kaixuxia@tencent.com>
---
v3:
-put the changes on the proper place.
v2:
-split out datasec_id definition into a separate line.
kernel/bpf/verifier.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 6200519582a6..6204ec705d80 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -9572,12 +9572,13 @@ static int check_pseudo_btf_id(struct bpf_verifier_env *env,
struct bpf_insn *insn,
struct bpf_insn_aux_data *aux)
{
- u32 datasec_id, type, id = insn->imm;
const struct btf_var_secinfo *vsi;
const struct btf_type *datasec;
const struct btf_type *t;
const char *sym_name;
bool percpu = false;
+ u32 type, id = insn->imm;
+ s32 datasec_id;
u64 addr;
int i;
--
2.20.0
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH v3] bpf: Fix unsigned 'datasec_id' compared with zero in check_pseudo_btf_id
2020-11-11 5:03 [PATCH v3] bpf: Fix unsigned 'datasec_id' compared with zero in check_pseudo_btf_id xiakaixu1987
@ 2020-11-11 5:13 ` Andrii Nakryiko
2020-11-11 9:34 ` John Fastabend
2020-11-11 10:07 ` Daniel Borkmann
1 sibling, 1 reply; 4+ messages in thread
From: Andrii Nakryiko @ 2020-11-11 5:13 UTC (permalink / raw)
To: xiakaixu1987
Cc: Alexei Starovoitov, Daniel Borkmann, Martin Lau, Song Liu,
Yonghong Song, Andrii Nakryiko, john fastabend, KP Singh,
Networking, bpf, open list, Kaixu Xia
On Tue, Nov 10, 2020 at 9:03 PM <xiakaixu1987@gmail.com> wrote:
>
> From: Kaixu Xia <kaixuxia@tencent.com>
>
> The unsigned variable datasec_id is assigned a return value from the call
> to check_pseudo_btf_id(), which may return negative error code.
>
> Fixes coccicheck warning:
>
> ./kernel/bpf/verifier.c:9616:5-15: WARNING: Unsigned expression compared with zero: datasec_id > 0
>
> Reported-by: Tosk Robot <tencent_os_robot@tencent.com>
> Signed-off-by: Kaixu Xia <kaixuxia@tencent.com>
> ---
Looks good.
Acked-by: Andrii Nakryiko <andrii@kernel.org>
[...]
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v3] bpf: Fix unsigned 'datasec_id' compared with zero in check_pseudo_btf_id
2020-11-11 5:13 ` Andrii Nakryiko
@ 2020-11-11 9:34 ` John Fastabend
0 siblings, 0 replies; 4+ messages in thread
From: John Fastabend @ 2020-11-11 9:34 UTC (permalink / raw)
To: Andrii Nakryiko, xiakaixu1987
Cc: Alexei Starovoitov, Daniel Borkmann, Martin Lau, Song Liu,
Yonghong Song, Andrii Nakryiko, john fastabend, KP Singh,
Networking, bpf, open list, Kaixu Xia
Andrii Nakryiko wrote:
> On Tue, Nov 10, 2020 at 9:03 PM <xiakaixu1987@gmail.com> wrote:
> >
> > From: Kaixu Xia <kaixuxia@tencent.com>
> >
> > The unsigned variable datasec_id is assigned a return value from the call
> > to check_pseudo_btf_id(), which may return negative error code.
> >
> > Fixes coccicheck warning:
> >
> > ./kernel/bpf/verifier.c:9616:5-15: WARNING: Unsigned expression compared with zero: datasec_id > 0
> >
> > Reported-by: Tosk Robot <tencent_os_robot@tencent.com>
> > Signed-off-by: Kaixu Xia <kaixuxia@tencent.com>
> > ---
>
> Looks good.
>
> Acked-by: Andrii Nakryiko <andrii@kernel.org>
>
> [...]
Acked-by: John Fastabend <john.fastabend@gmail.com>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v3] bpf: Fix unsigned 'datasec_id' compared with zero in check_pseudo_btf_id
2020-11-11 5:03 [PATCH v3] bpf: Fix unsigned 'datasec_id' compared with zero in check_pseudo_btf_id xiakaixu1987
2020-11-11 5:13 ` Andrii Nakryiko
@ 2020-11-11 10:07 ` Daniel Borkmann
1 sibling, 0 replies; 4+ messages in thread
From: Daniel Borkmann @ 2020-11-11 10:07 UTC (permalink / raw)
To: xiakaixu1987, ast, kafai, songliubraving, yhs, andrii,
john.fastabend, kpsingh
Cc: netdev, bpf, linux-kernel, Kaixu Xia
On 11/11/20 6:03 AM, xiakaixu1987@gmail.com wrote:
> From: Kaixu Xia <kaixuxia@tencent.com>
>
> The unsigned variable datasec_id is assigned a return value from the call
> to check_pseudo_btf_id(), which may return negative error code.
>
> Fixes coccicheck warning:
>
> ./kernel/bpf/verifier.c:9616:5-15: WARNING: Unsigned expression compared with zero: datasec_id > 0
>
> Reported-by: Tosk Robot <tencent_os_robot@tencent.com>
> Signed-off-by: Kaixu Xia <kaixuxia@tencent.com>
Looks good, applied & also added Fixes tags, thanks!
^ permalink raw reply [flat|nested] 4+ messages in thread
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2020-11-11 5:03 [PATCH v3] bpf: Fix unsigned 'datasec_id' compared with zero in check_pseudo_btf_id xiakaixu1987
2020-11-11 5:13 ` Andrii Nakryiko
2020-11-11 9:34 ` John Fastabend
2020-11-11 10:07 ` Daniel Borkmann
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