Messages in this thread Patch in this message | | | Subject | [PATCH] Backport the 2.3.22 ptrace patch | Date | Fri, 17 Mar 2000 16:48:42 -0600 | From | Jeff Dike <> |
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Would it be possible (and likely :-) to stick the 2.3.22 patch below into 2.2.x? It removes the restriction that ptrace(POKEUSER, ...) can't modify system call numbers.
This is needed by my user-mode port and a few other apps. It would be convenient for users to have this already in their kernels.
Thanks, Jeff
diff -u --recursive --new-file v2.3.21/linux/arch/i386/kernel/entry.S linux/arch/i386/kernel/entry.S --- v2.3.21/linux/arch/i386/kernel/entry.S Sat Oct 9 11:47:50 1999 +++ linux/arch/i386/kernel/entry.S Tue Oct 12 10:05:53 1999 @@ -237,8 +237,11 @@ movl $-ENOSYS,EAX(%esp) call SYMBOL_NAME(syscall_trace) movl ORIG_EAX(%esp),%eax + cmpl $(NR_syscalls),%eax + jae tracesys_exit call *SYMBOL_NAME(sys_call_table)(,%eax,4) movl %eax,EAX(%esp) # save the return value +tracesys_exit: call SYMBOL_NAME(syscall_trace) jmp ret_from_sys_call badsys: diff -u --recursive --new-file v2.3.21/linux/arch/i386/kernel/ptrace.c linux/arch/i386/kernel/ptrace.c --- v2.3.21/linux/arch/i386/kernel/ptrace.c Sun Jul 11 09:11:46 1999 +++ linux/arch/i386/kernel/ptrace.c Tue Oct 12 10:05:53 1999 @@ -71,8 +71,6 @@ unsigned long regno, unsigned long value) { switch (regno >> 2) { - case ORIG_EAX: - return -EIO; case FS: if (value && (value & 3) != 3) return -EIO;
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