Re: Reserving a syscall number

[John Richard Moser]

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linux-os wrote:
| On Wed, 27 Oct 2004, John Richard Moser wrote:
|
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|> How would one go about having a specific syscall number reserved in
|> entry.S?  I'm exploring doing a kill inside the kernel from a detection
|> done in userspace, which would allow the executable header of the binary
|> to indicate whether the task should be killed or not; if it works, the
|> changes will likely not go into mainline, but will still require a
|> non-changing syscall index (assuming I understood the syscall manpage
|> properly).
|>
|> On a side note, if a syscall doesn't exist, how would that be detected
|> in userspace?
|> - --
|
|
| Look at ld.so.preload for potential capabilities to control any
| executable.
|
| Also what's the problem with sending the task a signal when
| the detection has been done?
|
| If the usual capabilites are not sufficient, then make
| a driver (module).
|

I'm attempting to figure a way to control the IBM stack smash protector
via a flag in the ELF header, without opening the executable image on
disk and checking manually.  If there is a way to do this from
userspace, that would be acceptable.

|
| Cheers,
| Dick Johnson
| Penguin : Linux version 2.6.9 on an i686 machine (5537.79 BogoMips).
|  Notice : All mail here is now cached and reviewed by John Ashcroft.
|                  98.36% of all statistics are fiction.
|

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