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| author | Alexei Starovoitov <[email protected]> | 2021-11-01 22:21:53 +0000 |
|---|---|---|
| committer | Andrii Nakryiko <[email protected]> | 2021-11-02 01:05:12 +0000 |
| commit | 0869e5078afbd1b22c20832b391b2d85291bc0a8 (patch) | |
| tree | 897e20cf1eba018a44b23d3362a05891de855e81 /scripts/gcc-plugins/sancov_plugin.c | |
| parent | bpf: Fix propagation of signed bounds from 64-bit min/max into 32-bit. (diff) | |
| download | kernel-0869e5078afbd1b22c20832b391b2d85291bc0a8.tar.gz kernel-0869e5078afbd1b22c20832b391b2d85291bc0a8.zip | |
selftests/bpf: Add a testcase for 64-bit bounds propagation issue.
./test_progs-no_alu32 -vv -t twfw
Before the 64-bit_into_32-bit fix:
19: (25) if r1 > 0x3f goto pc+6
R1_w=inv(id=0,umax_value=63,var_off=(0x0; 0xff),s32_max_value=255,u32_max_value=255)
and eventually:
invalid access to map value, value_size=8 off=7 size=8
R6 max value is outside of the allowed memory range
libbpf: failed to load object 'no_alu32/twfw.o'
After the fix:
19: (25) if r1 > 0x3f goto pc+6
R1_w=inv(id=0,umax_value=63,var_off=(0x0; 0x3f))
verif_twfw:OK
Signed-off-by: Alexei Starovoitov <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Acked-by: Yonghong Song <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
Diffstat (limited to 'scripts/gcc-plugins/sancov_plugin.c')
0 files changed, 0 insertions, 0 deletions