On Thu, Nov 21, 2019 at 9:08 AM Yonghong Song <yhs@xxxxxx> wrote:
>
> With latest llvm, bpf selftest test_progs, which has +alu32 enabled, failed for
> strobemeta.o and a few other subtests. The reason is due to that
> verifier did not provide better var_off.mask after jmp32 instructions.
> This patch set addressed this issue and after the fix, test_progs passed
> with alu32.
>
> Patch #1 provided detailed explanation of the problem and the fix.
> Patch #2 added three tests in test_verifier.
>
> Changelog:
> v1 -> v2:
> - do not directly manipulate tnum.{value,mask} in __reg_bound_offset32(),
> using tnum_lshift/tnum_rshift functions instead
> - do __reg_bound_offset32() after regular 64bit __reg_bound_offset()
> since the latter may give a better upper 32bit var_off, which can
> be inherited by __reg_bound_offset32().
I fixed white space damage and adjusted subject line of patch 2.
And applied to bpf-next. Thanks
