Introduce the new function

        p_trespass(struct proc *p1, struct proc *p2)
which returns zero or an errno depending on the legality of p1 trespassing
on p2.

Replace kern_sig.c:CANSIGNAL() with call to p_trespass() and one
extra signal related check.

Replace procfs.h:CHECKIO() macros with calls to p_trespass().

Only show command lines to process which can trespass on the target
process.

1 files changed, 1 insertions, 2 deletions

diff --git a/sys/kern/sys_process.c b/sys/kern/sys_process.c
index 75b72fb..4740476 100644
--- a/sys/kern/sys_process.c
+++ b/sys/kern/sys_process.c
@@ -420,8 +420,7 @@ ptrace(curp, uap)
 			return EFAULT;
 		}
 		if (ptrace_read_u_check(p,(vm_offset_t) uap->addr,
-					sizeof(int)) &&
-		    !procfs_kmemaccess(curp)) {
+					sizeof(int))) {
 			return EFAULT;
 		}
 		error = 0;