e9aabcf2f8
library to the memory driver. Always put output from within TTY directly on the console. Removed second include of driver.h from tty.c. Made tty_inrepcode bigger. First step to move PM and FS calls that are not regular (API) system calls out of callnr.h (renumbered them, and removed them from the table.c files). Imported the Minix-vmd uname implementation. This provides a more stable ABI than the current implementation. Added a bit of security checking. Unfortunately not nearly enough to get a secure system. Fixed a bug related to the sizes of the programs in the image (in PM patch_mem_chunks).
172 lines
5 KiB
C
172 lines
5 KiB
C
/* This file contains some utility routines for PM.
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*
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* The entry points are:
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* find_param: look up a boot monitor parameter
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* get_free_pid: get a free process or group id
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* allowed: see if an access is permitted
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* no_sys: called for invalid system call numbers
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* panic: PM has run aground of a fatal error
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* get_mem_map: get memory map of given process
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* get_stack_ptr: get stack pointer of given process
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* proc_from_pid: return process pointer from pid number
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*/
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#include "pm.h"
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#include <sys/stat.h>
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#include <minix/callnr.h>
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#include <minix/com.h>
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#include <minix/endpoint.h>
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#include <fcntl.h>
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#include <signal.h> /* needed only because mproc.h needs it */
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#include "mproc.h"
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#include "param.h"
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#include <minix/config.h>
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#include <timers.h>
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#include <string.h>
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#include "../../kernel/const.h"
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#include "../../kernel/config.h"
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#include "../../kernel/type.h"
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#include "../../kernel/proc.h"
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/*===========================================================================*
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* get_free_pid *
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*===========================================================================*/
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PUBLIC pid_t get_free_pid()
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{
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static pid_t next_pid = INIT_PID + 1; /* next pid to be assigned */
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register struct mproc *rmp; /* check process table */
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int t; /* zero if pid still free */
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/* Find a free pid for the child and put it in the table. */
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do {
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t = 0;
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next_pid = (next_pid < NR_PIDS ? next_pid + 1 : INIT_PID + 1);
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for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++)
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if (rmp->mp_pid == next_pid || rmp->mp_procgrp == next_pid) {
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t = 1;
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break;
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}
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} while (t); /* 't' = 0 means pid free */
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return(next_pid);
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}
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/*===========================================================================*
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* no_sys *
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*===========================================================================*/
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PUBLIC int no_sys()
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{
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/* A system call number not implemented by PM has been requested. */
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printf("PM: in no_sys, call nr %d from %d\n", call_nr, who_e);
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return(ENOSYS);
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}
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/*===========================================================================*
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* panic *
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*===========================================================================*/
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PUBLIC void panic(who, mess, num)
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char *who; /* who caused the panic */
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char *mess; /* panic message string */
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int num; /* number to go with it */
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{
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/* An unrecoverable error has occurred. Panics are caused when an internal
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* inconsistency is detected, e.g., a programming error or illegal value of a
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* defined constant. The process manager decides to exit.
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*/
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message m;
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int s;
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/* Switch to primary console and print panic message. */
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printf("PM panic (%s): %s", who, mess);
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if (num != NO_NUM) printf(": %d",num);
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printf("\n");
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/* Exit PM. */
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sys_exit(SELF);
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}
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/*===========================================================================*
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* find_param *
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*===========================================================================*/
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PUBLIC char *find_param(name)
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const char *name;
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{
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register const char *namep;
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register char *envp;
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for (envp = (char *) monitor_params; *envp != 0;) {
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for (namep = name; *namep != 0 && *namep == *envp; namep++, envp++)
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;
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if (*namep == '\0' && *envp == '=')
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return(envp + 1);
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while (*envp++ != 0)
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;
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}
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return(NULL);
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}
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/*===========================================================================*
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* get_mem_map *
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*===========================================================================*/
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PUBLIC int get_mem_map(proc_nr, mem_map)
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int proc_nr; /* process to get map of */
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struct mem_map *mem_map; /* put memory map here */
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{
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struct proc p;
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int s;
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if ((s=sys_getproc(&p, proc_nr)) != OK)
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return(s);
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memcpy(mem_map, p.p_memmap, sizeof(p.p_memmap));
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return(OK);
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}
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/*===========================================================================*
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* get_stack_ptr *
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*===========================================================================*/
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PUBLIC int get_stack_ptr(proc_nr_e, sp)
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int proc_nr_e; /* process to get sp of */
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vir_bytes *sp; /* put stack pointer here */
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{
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struct proc p;
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int s;
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if ((s=sys_getproc(&p, proc_nr_e)) != OK)
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return(s);
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*sp = p.p_reg.sp;
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return(OK);
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}
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/*===========================================================================*
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* proc_from_pid *
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*===========================================================================*/
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PUBLIC int proc_from_pid(mp_pid)
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pid_t mp_pid;
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{
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int rmp;
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for (rmp = 0; rmp < NR_PROCS; rmp++)
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if (mproc[rmp].mp_pid == mp_pid)
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return rmp;
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return -1;
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}
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/*===========================================================================*
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* pm_isokendpt *
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*===========================================================================*/
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PUBLIC int pm_isokendpt(int endpoint, int *proc)
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{
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*proc = _ENDPOINT_P(endpoint);
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if(*proc < -NR_TASKS || *proc >= NR_PROCS)
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return EINVAL;
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if(*proc >= 0 && endpoint != mproc[*proc].mp_endpoint)
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return EDEADSRCDST;
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if(*proc >= 0 && !(mproc[*proc].mp_flags & IN_USE))
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return EDEADSRCDST;
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return OK;
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}
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