On Wednesday 15 October 2008, Elder Costa wrote: > I have run the latest CVS version and noticed ptrace06 is not being > compiled. Previous versions did compile but did not include it in the > default test lists so it was not running. > > Anyway I am getting an error when I run it in two different systems with > Ubuntu Feisty: > > ptrace06 16 FAIL : ptrace(PEEKUSER, ..., 0xc0, (nil)) returned 0 > instead of -1 > ptrace06 17 PASS : ptrace(PEEKUSER, ..., 0xc1, (nil)) failed as > expected > ptrace06 18 PASS : ptrace(PEEKUSER, ..., 0xc2, (nil)) failed as > expected > ptrace06 19 PASS : ptrace(PEEKUSER, ..., 0xc3, (nil)) failed as > expected > p > > > I understand the test fails because ptrace was supposed to return -1 > because the address supplied by the third argument is beyond pt_regs > struct boundaries. I did a quick test with Fedora as well and it fails > in the very same place. Is this the reason why this test has been > suppressed?
the point of the test is to make sure out-of-bound values are rejected. some arches may do weird things beyond sizeof(pt_regs), but the kernel needs to be checked to see if that is the case. or more importantly, is the kernel not properly doing range checking and thus allowing people to peek at data they shouldnt ... -mike
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