493 lines
13 KiB
C
493 lines
13 KiB
C
/* Miscellaneous system calls. Author: Kees J. Bot
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* 31 Mar 2000
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* The entry points into this file are:
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* do_reboot: kill all processes, then reboot system
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* do_getsysinfo: request copy of PM data structure (Jorrit N. Herder)
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* do_getprocnr: lookup process slot number (Jorrit N. Herder)
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* do_getepinfo: get the pid/uid/gid of a process given its endpoint
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* do_getsetpriority: get/set process priority
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* do_svrctl: process manager control
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*/
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#define brk _brk
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#include "pm.h"
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#include <minix/callnr.h>
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#include <signal.h>
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#include <sys/svrctl.h>
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#include <sys/resource.h>
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#include <sys/utsname.h>
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#include <minix/com.h>
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#include <minix/config.h>
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#include <minix/sysinfo.h>
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#include <minix/type.h>
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#include <minix/vm.h>
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#include <string.h>
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#include <machine/archtypes.h>
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#include <lib.h>
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#include <assert.h>
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#include "mproc.h"
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#include "param.h"
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#include "kernel/proc.h"
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struct utsname uts_val = {
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"Minix", /* system name */
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"noname", /* node/network name */
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OS_RELEASE, /* O.S. release (e.g. 1.5) */
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OS_VERSION, /* O.S. version (e.g. 10) */
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"xyzzy", /* machine (cpu) type (filled in later) */
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#if defined(__i386__)
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"i386", /* architecture */
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#elif defined(__arm__)
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"arm", /* architecture */
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#else
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#error /* oops, no 'uname -mk' */
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#endif
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};
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static char *uts_tbl[] = {
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uts_val.arch,
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NULL, /* No kernel architecture */
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uts_val.machine,
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NULL, /* No hostname */
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uts_val.nodename,
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uts_val.release,
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uts_val.version,
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uts_val.sysname,
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NULL, /* No bus */ /* No bus */
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};
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#if ENABLE_SYSCALL_STATS
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unsigned long calls_stats[NCALLS];
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#endif
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/*===========================================================================*
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* do_sysuname *
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*===========================================================================*/
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int do_sysuname()
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{
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/* Set or get uname strings. */
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int r;
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size_t n;
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char *string;
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#if 0 /* for updates */
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char tmp[sizeof(uts_val.nodename)];
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static short sizes[] = {
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0, /* arch, (0 = read-only) */
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0, /* kernel */
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0, /* machine */
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0, /* sizeof(uts_val.hostname), */
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sizeof(uts_val.nodename),
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0, /* release */
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0, /* version */
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0, /* sysname */
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};
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#endif
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if ((unsigned) m_in.sysuname_field >= _UTS_MAX) return(EINVAL);
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string = uts_tbl[m_in.sysuname_field];
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if (string == NULL)
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return EINVAL; /* Unsupported field */
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switch (m_in.sysuname_req) {
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case _UTS_GET:
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/* Copy an uname string to the user. */
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n = strlen(string) + 1;
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if (n > m_in.sysuname_len) n = m_in.sysuname_len;
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r = sys_vircopy(SELF, (phys_bytes) string,
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mp->mp_endpoint, (phys_bytes) m_in.sysuname_value,
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(phys_bytes) n);
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if (r < 0) return(r);
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break;
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#if 0 /* no updates yet */
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case _UTS_SET:
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/* Set an uname string, needs root power. */
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len = sizes[m_in.sysuname_field];
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if (mp->mp_effuid != 0 || len == 0) return(EPERM);
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n = len < m_in.sysuname_len ? len : m_in.sysuname_len;
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if (n <= 0) return(EINVAL);
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r = sys_vircopy(mp->mp_endpoint, (phys_bytes) m_in.sysuname_value,
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SELF, (phys_bytes) tmp, (phys_bytes) n);
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if (r < 0) return(r);
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tmp[n-1] = 0;
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strcpy(string, tmp);
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break;
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#endif
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default:
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return(EINVAL);
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}
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/* Return the number of bytes moved. */
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return(n);
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}
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/*===========================================================================*
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* do_getsysinfo *
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*===========================================================================*/
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int do_getsysinfo()
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{
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vir_bytes src_addr, dst_addr;
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size_t len;
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/* This call leaks important information. In the future, requests from
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* non-system processes should be denied.
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*/
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if (mp->mp_effuid != 0)
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{
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printf("PM: unauthorized call of do_getsysinfo by proc %d '%s'\n",
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mp->mp_endpoint, mp->mp_name);
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sys_sysctl_stacktrace(mp->mp_endpoint);
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return EPERM;
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}
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switch(m_in.SI_WHAT) {
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case SI_PROC_TAB: /* copy entire process table */
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src_addr = (vir_bytes) mproc;
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len = sizeof(struct mproc) * NR_PROCS;
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break;
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#if ENABLE_SYSCALL_STATS
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case SI_CALL_STATS:
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src_addr = (vir_bytes) calls_stats;
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len = sizeof(calls_stats);
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break;
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#endif
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default:
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return(EINVAL);
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}
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if (len != m_in.SI_SIZE)
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return(EINVAL);
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dst_addr = (vir_bytes) m_in.SI_WHERE;
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return sys_datacopy(SELF, src_addr, who_e, dst_addr, len);
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}
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/*===========================================================================*
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* do_getprocnr *
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*===========================================================================*/
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int do_getprocnr()
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{
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register struct mproc *rmp;
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static char search_key[PROC_NAME_LEN+1];
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int key_len;
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int s;
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/* This call should be moved to DS. */
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if (mp->mp_effuid != 0)
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{
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/* For now, allow non-root processes to request their own endpoint. */
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if (m_in.pid < 0 && m_in.namelen == 0) {
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mp->mp_reply.PM_ENDPT = who_e;
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mp->mp_reply.PM_PENDPT = NONE;
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return OK;
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}
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printf("PM: unauthorized call of do_getprocnr by proc %d\n",
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mp->mp_endpoint);
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sys_sysctl_stacktrace(mp->mp_endpoint);
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return EPERM;
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}
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#if 0
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printf("PM: do_getprocnr(%d) call from endpoint %d, %s\n",
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m_in.pid, mp->mp_endpoint, mp->mp_name);
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#endif
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if (m_in.pid >= 0) { /* lookup process by pid */
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if ((rmp = find_proc(m_in.pid)) != NULL) {
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mp->mp_reply.PM_ENDPT = rmp->mp_endpoint;
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#if 0
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printf("PM: pid result: %d\n", rmp->mp_endpoint);
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#endif
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return(OK);
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}
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return(ESRCH);
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} else if (m_in.namelen > 0) { /* lookup process by name */
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key_len = MIN(m_in.namelen, PROC_NAME_LEN);
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if (OK != (s=sys_datacopy(who_e, (vir_bytes) m_in.PMBRK_ADDR,
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SELF, (vir_bytes) search_key, key_len)))
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return(s);
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search_key[key_len] = '\0'; /* terminate for safety */
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for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++) {
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if (((rmp->mp_flags & (IN_USE | EXITING)) == IN_USE) &&
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strncmp(rmp->mp_name, search_key, key_len)==0) {
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mp->mp_reply.PM_ENDPT = rmp->mp_endpoint;
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return(OK);
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}
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}
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return(ESRCH);
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} else { /* return own/parent process number */
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#if 0
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printf("PM: endpt result: %d\n", mp->mp_reply.PM_ENDPT);
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#endif
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mp->mp_reply.PM_ENDPT = who_e;
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mp->mp_reply.PM_PENDPT = mproc[mp->mp_parent].mp_endpoint;
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}
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return(OK);
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}
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/*===========================================================================*
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* do_getepinfo *
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*===========================================================================*/
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int do_getepinfo()
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{
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register struct mproc *rmp;
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endpoint_t ep;
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ep = m_in.PM_ENDPT;
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for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++) {
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if ((rmp->mp_flags & IN_USE) && (rmp->mp_endpoint == ep)) {
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mp->mp_reply.reply_res2 = rmp->mp_effuid;
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mp->mp_reply.reply_res3 = rmp->mp_effgid;
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return(rmp->mp_pid);
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}
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}
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/* Process not found */
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return(ESRCH);
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}
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/*===========================================================================*
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* do_getepinfo_o *
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*===========================================================================*/
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int do_getepinfo_o()
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{
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register struct mproc *rmp;
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endpoint_t ep;
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/* This call should be moved to DS. */
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if (mp->mp_effuid != 0) {
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printf("PM: unauthorized call of do_getepinfo_o by proc %d\n",
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mp->mp_endpoint);
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sys_sysctl_stacktrace(mp->mp_endpoint);
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return EPERM;
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}
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ep = m_in.PM_ENDPT;
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for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++) {
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if ((rmp->mp_flags & IN_USE) && (rmp->mp_endpoint == ep)) {
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mp->mp_reply.reply_res2 = (short) rmp->mp_effuid;
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mp->mp_reply.reply_res3 = (char) rmp->mp_effgid;
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return(rmp->mp_pid);
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}
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}
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/* Process not found */
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return(ESRCH);
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}
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/*===========================================================================*
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* do_reboot *
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*===========================================================================*/
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int do_reboot()
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{
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message m;
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/* Check permission to abort the system. */
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if (mp->mp_effuid != SUPER_USER) return(EPERM);
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/* See how the system should be aborted. */
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abort_flag = (unsigned) m_in.reboot_flag;
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if (abort_flag >= RBT_INVALID) return(EINVAL);
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/* Order matters here. When VFS is told to reboot, it exits all its
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* processes, and then would be confused if they're exited again by
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* SIGKILL. So first kill, then reboot.
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*/
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check_sig(-1, SIGKILL, FALSE /* ksig*/); /* kill all users except init */
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sys_stop(INIT_PROC_NR); /* stop init, but keep it around */
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/* Tell VFS to reboot */
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m.m_type = PM_REBOOT;
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tell_vfs(&mproc[VFS_PROC_NR], &m);
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return(SUSPEND); /* don't reply to caller */
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}
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/*===========================================================================*
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* do_getsetpriority *
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*===========================================================================*/
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int do_getsetpriority()
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{
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int r, arg_which, arg_who, arg_pri;
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struct mproc *rmp;
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arg_which = m_in.m1_i1;
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arg_who = m_in.m1_i2;
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arg_pri = m_in.m1_i3; /* for SETPRIORITY */
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/* Code common to GETPRIORITY and SETPRIORITY. */
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/* Only support PRIO_PROCESS for now. */
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if (arg_which != PRIO_PROCESS)
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return(EINVAL);
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if (arg_who == 0)
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rmp = mp;
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else
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if ((rmp = find_proc(arg_who)) == NULL)
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return(ESRCH);
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if (mp->mp_effuid != SUPER_USER &&
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mp->mp_effuid != rmp->mp_effuid && mp->mp_effuid != rmp->mp_realuid)
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return EPERM;
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/* If GET, that's it. */
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if (call_nr == GETPRIORITY) {
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return(rmp->mp_nice - PRIO_MIN);
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}
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/* Only root is allowed to reduce the nice level. */
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if (rmp->mp_nice > arg_pri && mp->mp_effuid != SUPER_USER)
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return(EACCES);
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/* We're SET, and it's allowed.
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*
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* The value passed in is currently between PRIO_MIN and PRIO_MAX.
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* We have to scale this between MIN_USER_Q and MAX_USER_Q to match
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* the kernel's scheduling queues.
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*/
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if ((r = sched_nice(rmp, arg_pri)) != OK) {
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return r;
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}
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rmp->mp_nice = arg_pri;
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return(OK);
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}
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/*===========================================================================*
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* do_svrctl *
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*===========================================================================*/
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int do_svrctl()
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{
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int s, req;
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vir_bytes ptr;
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#define MAX_LOCAL_PARAMS 2
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static struct {
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char name[30];
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char value[30];
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} local_param_overrides[MAX_LOCAL_PARAMS];
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static int local_params = 0;
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req = m_in.svrctl_req;
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ptr = (vir_bytes) m_in.svrctl_argp;
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/* Is the request indeed for the PM? */
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if (((req >> 8) & 0xFF) != 'M') return(EINVAL);
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/* Control operations local to the PM. */
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switch(req) {
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case PMSETPARAM:
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case PMGETPARAM: {
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struct sysgetenv sysgetenv;
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char search_key[64];
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char *val_start;
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size_t val_len;
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size_t copy_len;
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/* Copy sysgetenv structure to PM. */
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if (sys_datacopy(who_e, ptr, SELF, (vir_bytes) &sysgetenv,
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sizeof(sysgetenv)) != OK) return(EFAULT);
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/* Set a param override? */
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if (req == PMSETPARAM) {
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if (local_params >= MAX_LOCAL_PARAMS) return ENOSPC;
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if (sysgetenv.keylen <= 0
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|| sysgetenv.keylen >=
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sizeof(local_param_overrides[local_params].name)
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|| sysgetenv.vallen <= 0
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|| sysgetenv.vallen >=
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sizeof(local_param_overrides[local_params].value))
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return EINVAL;
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if ((s = sys_datacopy(who_e, (vir_bytes) sysgetenv.key,
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SELF, (vir_bytes) local_param_overrides[local_params].name,
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sysgetenv.keylen)) != OK)
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return s;
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if ((s = sys_datacopy(who_e, (vir_bytes) sysgetenv.val,
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SELF, (vir_bytes) local_param_overrides[local_params].value,
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sysgetenv.vallen)) != OK)
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return s;
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local_param_overrides[local_params].name[sysgetenv.keylen] = '\0';
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local_param_overrides[local_params].value[sysgetenv.vallen] = '\0';
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local_params++;
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return OK;
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}
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if (sysgetenv.keylen == 0) { /* copy all parameters */
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val_start = monitor_params;
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val_len = sizeof(monitor_params);
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}
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else { /* lookup value for key */
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int p;
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/* Try to get a copy of the requested key. */
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if (sysgetenv.keylen > sizeof(search_key)) return(EINVAL);
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if ((s = sys_datacopy(who_e, (vir_bytes) sysgetenv.key,
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SELF, (vir_bytes) search_key, sysgetenv.keylen)) != OK)
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return(s);
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/* Make sure key is null-terminated and lookup value.
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* First check local overrides.
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*/
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search_key[sysgetenv.keylen-1]= '\0';
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for(p = 0; p < local_params; p++) {
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if (!strcmp(search_key, local_param_overrides[p].name)) {
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val_start = local_param_overrides[p].value;
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break;
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}
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}
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if (p >= local_params && (val_start = find_param(search_key)) == NULL)
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return(ESRCH);
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val_len = strlen(val_start) + 1;
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}
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/* See if it fits in the client's buffer. */
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if (val_len > sysgetenv.vallen)
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return E2BIG;
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/* Value found, make the actual copy (as far as possible). */
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copy_len = MIN(val_len, sysgetenv.vallen);
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if ((s=sys_datacopy(SELF, (vir_bytes) val_start,
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who_e, (vir_bytes) sysgetenv.val, copy_len)) != OK)
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return(s);
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return OK;
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}
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default:
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return(EINVAL);
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}
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}
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/*===========================================================================*
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* _brk *
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*===========================================================================*/
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extern char *_brksize;
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int brk(brk_addr)
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void *brk_addr;
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{
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int r;
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/* PM wants to call brk() itself. */
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if((r=vm_brk(PM_PROC_NR, brk_addr)) != OK) {
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#if 0
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printf("PM: own brk(%p) failed: vm_brk() returned %d\n",
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brk_addr, r);
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#endif
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return -1;
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}
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_brksize = brk_addr;
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return 0;
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}
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