Re: ptrace in 2.6.5

[Davide Libenzi]

On Mon, 10 May 2004, Davide Libenzi wrote:

> On the kernel side, this would be pretty much solved by issuing a ptrace 
> op, with a modified EIP (+2) on return from a syscall (if in single-step 
> mode).

Actaully, the EIP should not be changed (since it already points to the 
intruction following INT 0x80) and I believe it is sufficent to replace 
the test for _TIF_SYSCALL_TRACE with (_TIF_SYSCALL_TRACE | TIF_SINGLESTEP) 
in the system call return path. This should generate a ptrace trap with 
EIP pointing to the next instruction following INT 0x80.



- Davide

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