Bug 122080 - 4G/4G patch breaks syscalls with 6 arguments
4G/4G patch breaks syscalls with 6 arguments
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: kernel (Show other bugs)
i686 Linux
medium Severity medium
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Assigned To: Ingo Molnar
Brian Brock
Depends On:
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Reported: 2004-04-30 05:32 EDT by Jakub Jelinek
Modified: 2007-11-30 17:07 EST (History)
2 users (show)

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Doc Type: Bug Fix
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Last Closed: 2005-09-15 13:29:27 EDT
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Description Jakub Jelinek 2004-04-30 05:32:29 EDT
i686 4G/4G sysenter vDSO handles only 5 syscalls and special-cases
mmap2.  Unfortunately, this is not the only 6 argument syscall on IA-32.
E.g. fadvise64_64 has 6 arguments too, there might be others.
I wonder if it is not possible to instead just do the get_user part
in sysenter_entry before switching page tables and deal with the possible
fault in the trap handler.
Comment 1 Jakub Jelinek 2004-04-30 05:33:44 EDT
Of course I meant "handles only 5 argument syscalls"...
Comment 2 Warren Togami 2005-05-20 05:37:53 EDT
Is this a issue for any non-i686 arch?
Since FC4 ships without 4G/4G, shouldn't this be FC5 instead of FC4 target?
Comment 3 Ingo Molnar 2005-09-15 13:29:27 EDT
closing this bug - it seems glibc is now working this around by always doing
int80 for fadvise64_64.

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