stable inclusion
from linux-4.19.193
commit d1e281d6cb8841122c4677b47fcebdc6f410bd74

--------------------------------

[ no upstream commit ]

Switch the comparison, so that is_branch_taken() will recognize that below
branch is never taken:

  [...]
  17: [...] R1_w=inv0 [...] R8_w=inv(id=0,smin_value=-2147483648,smax_value=-1,umin_value=18446744071562067968,var_off=(0xffffffff80000000; 0x7fffffff)) [...]
  17: (67) r8 <<= 32
  18: [...] R8_w=inv(id=0,smax_value=-4294967296,umin_value=9223372036854775808,umax_value=18446744069414584320,var_off=(0x8000000000000000; 0x7fffffff00000000)) [...]
  18: (c7) r8 s>>= 32
  19: [...] R8_w=inv(id=0,smin_value=-2147483648,smax_value=-1,umin_value=18446744071562067968,var_off=(0xffffffff80000000; 0x7fffffff)) [...]
  19: (6d) if r1 s> r8 goto pc+16
  [...] R1_w=inv0 [...] R8_w=inv(id=0,smin_value=-2147483648,smax_value=-1,umin_value=18446744071562067968,var_off=(0xffffffff80000000; 0x7fffffff)) [...]
  [...]

Currently we check for is_branch_taken() only if either K is source, or source
is a scalar value that is const. For upstream it would be good to extend this
properly to check whether dst is const and src not.

For the sake of the test_verifier, it is probably not needed here:

  # ./test_verifier 101
  #101/p bpf_get_stack return R0 within range OK
  Summary: 1 PASSED, 0 SKIPPED, 0 FAILED

I haven't seen this issue in test_progs* though, they are passing fine:

  # ./test_progs-no_alu32 -t get_stack
  Switching to flavor 'no_alu32' subdirectory...
  #20 get_stack_raw_tp:OK
  Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED

  # ./test_progs -t get_stack
  #20 get_stack_raw_tp:OK
  Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
Acked-by: NAlexei Starovoitov <ast@kernel.org>
Acked-by: NJohn Fastabend <john.fastabend@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
[OP: backport to 4.19]
Signed-off-by: NOvidiu Panait <ovidiu.panait@windriver.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>