Messages in this thread | | | From | Roland McGrath <> | Subject | Re: Current utrace breaks UML | Date | Fri, 25 May 2007 18:35:13 -0700 (PDT) |
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> UML, obviously. Below is a smaller test. orig_eax is wrong, so you > can't read the system call number from the process.
Oops! I overlooked the need to preserve the orig_eax value, though its necessity is obvious. This makes me wonder about those previous reports that UML was working OK.
I refined the test case a little and that's in https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=241408
I've fixed this in the latest utrace patch set. I also wired up sysemu on x86_64. This means 32-bit processes calling ptrace now support it for full compatibility with native i386, which the vanilla kernel does not. It also means it works for 64-bit ptrace calls, whether operating on a 64-bit or a 32-bit target process.
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