Messages in this thread | | | Date | Wed, 5 Apr 2006 23:20:07 -0400 | From | "Albert Cahalan" <> | Subject | 32-on-64 (x86-64) siginfo corruption |
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The situation: 32-bit debugger, 32-bit child, 64-bit kernel
The debugger sends an RT signal to the child. (to stop it, with a queue and siginfo so that non-debugger signals don't get lost) To do this, the debugger uses tgkill().
Later, the debugger checks the child's siginfo_t before discarding it. This is to be sure that the child didn't get the RT signal from some other source. The debugger fills a siginfo_t with 0xff, then fetches siginfo data via ptrace. The data is corrupt:
FIELD 32-ON-64 NORMAL si_pid -1 getpid() si_uid getpid() getuid()
The "getpid" and "getuid" above are done in the debugger, not in the child. The si_code values are SI_TKILL.
Probably the other ports with 32-on-64 support ought to verify that this stuff works right. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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