system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-10-02 01:10:22 +00:00
Code Issues Packages Projects Releases Wiki Activity

selftests/bpf: add iter test requiring range x range logic

Browse source 
Add a simple verifier test that requires deriving reg bounds for one
register from another register that's not a constant. This is
a realistic example of iterating elements of an array with fixed maximum
number of elements, but smaller actual number of elements.

This small example was an original motivation for doing this whole patch
set in the first place, yes.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20231112010609.848406-14-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko 2023-11-11 17:06:09 -08:00 committed by Alexei Starovoitov
parent a5c57f81eb
commit 882e3d873c
1 changed files with 22 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

22
tools/testing/selftests/bpf/progs/iters.c
View file

@ -1411,4 +1411,26 @@ __naked int checkpoint_states_deletion(void)
);
}
struct {
int data[32];
int n;
} loop_data;
SEC("raw_tp")
__success
int iter_arr_with_actual_elem_count(const void *ctx)
{
int i, n = loop_data.n, sum = 0;
if (n > ARRAY_SIZE(loop_data.data))
return 0;
bpf_for(i, 0, n) {
/* no rechecking of i against ARRAY_SIZE(loop_data.n) */
sum += loop_data.data[i];
}
return sum;
}
char _license[] SEC("license") = "GPL";