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p_candebug (9)

>> p_candebug (9) ( FreeBSD man: Ядро )

BSD mandoc

NAME

p_candebug

 - determine debuggability of a process

#include <sys/param.h>
#include <sys/proc.h>
int p_candebug (struct thread *td struct proc *p);

This function can be used to determine if a given process Fa p is debuggable by the thread Fa td .

The following sysctl(8) variables directly influence the behaviour of p_candebug (:);

kern.securelevel: Debugging of the init process is not allowed if this variable is 1 or greater.
security.bsd.unprivileged_proc_debug: Must be set to a non-zero value to allow unprivileged processes access to the kernel's debug facilities.

The p_candebug ();
function returns 0 if the process denoted by Fa p is debuggable by thread Fa td , or a non-zero error return value otherwise.

Bq Er EACCESS: The MAC subsystem denied debuggability.
Bq Er EAGAIN: Process Fa p is in the process of being exec (Ns 'ed.);
Bq Er EPERM: Thread Fa td lacks super-user credentials and process Fa p is executing a set-user-ID or set-group-ID executable.
Bq Er EPERM: Thread Fa td lacks super-user credentials and process Fa p Ns 's group set is not a subset of Fa td Ns 's effective group set.
Bq Er EPERM: Thread Fa td lacks super-user credentials and process Fa p Ns 's user IDs do not match thread Fa td Ns 's effective user ID.
Bq Er EPERM: Process Fa p denotes the initial process initproc ();
and the sysctl(8) variable kern.securelevel is greater than zero.
Bq Er ESRCH: Process Fa p is not visible to thread Fa td as determined by cr_seeotheruids9 or cr_seeothergids9.
Bq Er ESRCH: Thread Fa td has been jailed and process Fa p does not belong to the same jail as Fa td .
Bq Er ESRCH: The MAC subsystem denied debuggability.

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