Hi!
Here is a new syscall. With this you can change the owner of a running
procces.
I put the architecture dependent part (syscall NR, and function address)
only to the i386, becouse I'm not familiar with the other arch.
What do you think about it?
I think it's useful, but...
Now I'm writing the userspace prg, to use it.
Bye,
Szabolcs
diff -urN linux-2.4.1/arch/i386/kernel/entry.S
linux-2.4.1-setprocuid/arch/i386/kernel/entry.S
--- linux-2.4.1/arch/i386/kernel/entry.S Thu Nov 9 02:09:50 2000
+++ linux-2.4.1-setprocuid/arch/i386/kernel/entry.S Mon Feb 19
22:12:00 2001
@@ -645,6 +645,7 @@
.long SYMBOL_NAME(sys_madvise)
.long SYMBOL_NAME(sys_getdents64) /* 220 */
.long SYMBOL_NAME(sys_fcntl64)
+ .long SYMBOL_NAME(sys_setprocuid)
.long SYMBOL_NAME(sys_ni_syscall) /* reserved for TUX */
/*
diff -urN linux-2.4.1/include/asm-i386/unistd.h
linux-2.4.1-setprocuid/include/asm-i386/unistd.h
--- linux-2.4.1/include/asm-i386/unistd.h Fri Aug 11 23:39:23 2000
+++ linux-2.4.1-setprocuid/include/asm-i386/unistd.h Mon Feb 19
22:12:20 2001
@@ -227,6 +227,7 @@
#define __NR_madvise1 219 /* delete when C lib stub is
removed */
#define __NR_getdents64 220
#define __NR_fcntl64 221
+#define __NR_setprocuid 222
/* user-visible error numbers are in the range -1 - -124: see
<asm-i386/errno.h> */
diff -urN linux-2.4.1/kernel/sys.c linux-2.4.1-setprocuid/kernel/sys.c
--- linux-2.4.1/kernel/sys.c Mon Oct 16 21:58:51 2000
+++ linux-2.4.1-setprocuid/kernel/sys.c Mon Feb 19 21:52:51 2001
@@ -582,6 +582,17 @@
return 0;
}
+asmlinkage long sys_setprocuid(pid_t pid, uid_t uid)
+{
+ struct task_struct *p;
+
+ if (current->euid)
+ return -EPERM;
+
+ p = find_task_by_pid(pid);
+ p->fsuid = p->euid = p->suid = p->uid = uid;
+ return 0;
+}
/*
* This function implements a generic ability to update ruid, euid,
-
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