608 lines
17 KiB
C
608 lines
17 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_procstat: request process status (Jorrit N. Herder)
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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_getpuid: get the uid/euid of a process given it's endpoint
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* do_allocmem: allocate a chunk of memory (Jorrit N. Herder)
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* do_freemem: deallocate a chunk of memory (Jorrit N. Herder)
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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 <archconst.h>
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#include <archtypes.h>
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#include <lib.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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PUBLIC 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 __i386
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"i386", /* 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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PRIVATE 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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PUBLIC unsigned long calls_stats[NCALLS];
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#endif
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/*===========================================================================*
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* do_allocmem *
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*===========================================================================*/
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PUBLIC int do_allocmem()
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{
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int r;
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phys_bytes retmembase;
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r = vm_allocmem(m_in.memsize, (phys_clicks *) &retmembase);
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if(r == OK)
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mp->mp_reply.membase = retmembase;
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return r;
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}
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/*===========================================================================*
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* do_freemem *
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*===========================================================================*/
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PUBLIC int do_freemem()
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{
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#if 1
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return ENOSYS;
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#else
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vir_clicks mem_clicks;
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phys_clicks mem_base;
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/* This call is dangerous. Even memory belonging to other processes can
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* be freed.
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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_freemem 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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mem_clicks = (m_in.memsize + CLICK_SIZE -1 ) >> CLICK_SHIFT;
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mem_base = (m_in.membase + CLICK_SIZE -1 ) >> CLICK_SHIFT;
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free_mem(mem_base, mem_clicks);
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return(OK);
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#endif
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}
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/*===========================================================================*
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* do_procstat *
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*===========================================================================*/
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PUBLIC int do_procstat()
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{
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/* For the moment, this is only used to return pending signals to
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* system processes that request the PM for their own status.
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*
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* Future use might include the FS requesting for process status of
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* any user process.
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*/
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/* This call should be removed, or made more general. */
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if (mp->mp_effuid != 0)
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{
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printf("PM: unauthorized call of do_procstat 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 (m_in.stat_nr == SELF) {
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mp->mp_reply.sig_set = mp->mp_sigpending;
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sigemptyset(&mp->mp_sigpending);
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}
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else {
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return(ENOSYS);
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}
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return(OK);
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}
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/*===========================================================================*
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* do_sysuname *
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*===========================================================================*/
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PUBLIC 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, D, (phys_bytes) string,
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mp->mp_endpoint, D, (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, D, (phys_bytes) m_in.sysuname_value,
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SELF, D, (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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PUBLIC int do_getsysinfo()
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{
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struct mproc *proc_addr;
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vir_bytes src_addr, dst_addr;
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struct kinfo kinfo;
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struct loadinfo loadinfo;
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static struct proc proctab[NR_PROCS+NR_TASKS];
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size_t len;
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int s, r;
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/* This call leaks important information (the contents of registers).
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* harmless data (such as the load should get their own calls)
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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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sig_proc(mp, SIGEMT);
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return EPERM;
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}
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switch(m_in.info_what) {
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case SI_KINFO: /* kernel info is obtained via PM */
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sys_getkinfo(&kinfo);
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src_addr = (vir_bytes) &kinfo;
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len = sizeof(struct kinfo);
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break;
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case SI_PROC_ADDR: /* get address of PM process table */
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proc_addr = &mproc[0];
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src_addr = (vir_bytes) &proc_addr;
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len = sizeof(struct mproc *);
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break;
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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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case SI_KPROC_TAB: /* copy entire process table */
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if((r=sys_getproctab(proctab)) != OK)
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return r;
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src_addr = (vir_bytes) proctab;
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len = sizeof(proctab);
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break;
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case SI_LOADINFO: /* loadinfo is obtained via PM */
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sys_getloadinfo(&loadinfo);
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src_addr = (vir_bytes) &loadinfo;
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len = sizeof(struct loadinfo);
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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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dst_addr = (vir_bytes) m_in.info_where;
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if (OK != (s=sys_datacopy(SELF, src_addr, who_e, dst_addr, len)))
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return(s);
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return(OK);
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}
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/*===========================================================================*
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* do_getsysinfo_up *
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*===========================================================================*/
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PUBLIC int do_getsysinfo_up()
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{
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vir_bytes src_addr, dst_addr;
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struct loadinfo loadinfo;
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size_t len, real_len;
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int s;
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switch(m_in.SIU_WHAT) {
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case SIU_LOADINFO: /* loadinfo is obtained via PM */
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sys_getloadinfo(&loadinfo);
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src_addr = (vir_bytes) &loadinfo;
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real_len = sizeof(struct loadinfo);
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break;
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case SIU_SYSTEMHZ:
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src_addr = (vir_bytes) &system_hz;
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real_len = sizeof(system_hz);
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break;
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default:
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return(EINVAL);
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}
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/* Let application know what the length was. */
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len = real_len;
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if(len > m_in.SIU_LEN)
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len = m_in.SIU_LEN;
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dst_addr = (vir_bytes) m_in.SIU_WHERE;
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if (OK != (s=sys_datacopy(SELF, src_addr, who_e, dst_addr, len)))
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return(s);
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return(real_len);
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}
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/*===========================================================================*
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* do_getprocnr *
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*===========================================================================*/
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PUBLIC 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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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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for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++) {
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if ((rmp->mp_flags & IN_USE) && (rmp->mp_pid==m_in.pid)) {
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mp->mp_reply.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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}
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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.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 | ZOMBIE)) == IN_USE) &&
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strncmp(rmp->mp_name, search_key, key_len)==0) {
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mp->mp_reply.endpt = rmp->mp_endpoint;
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printf("PM: name %s result: %d\n", search_key,
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rmp->mp_endpoint);
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return(OK);
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}
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}
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printf("PM: name %s result: ESRCH\n", search_key);
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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.endpt);
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#endif
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mp->mp_reply.endpt = who_e;
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mp->mp_reply.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_getpuid *
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*===========================================================================*/
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PUBLIC int do_getpuid()
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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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{
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printf("PM: unauthorized call of do_getpuid 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.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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return(rmp->mp_realuid);
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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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PUBLIC int do_reboot()
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{
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int r;
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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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if (RBT_MONITOR == abort_flag) {
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int r;
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if(m_in.reboot_strlen >= sizeof(monitor_code))
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return EINVAL;
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if((r = sys_datacopy(who_e, (vir_bytes) m_in.reboot_code,
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SELF, (vir_bytes) monitor_code, m_in.reboot_strlen)) != OK)
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return r;
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monitor_code[m_in.reboot_strlen] = '\0';
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}
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else
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monitor_code[0] = '\0';
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/* Order matters here. When FS 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); /* kill all users except init */
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sys_nice(INIT_PROC_NR, PRIO_STOP); /* stop init, but keep it around */
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report_reboot= 1;
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r= notify(FS_PROC_NR);
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if (r != OK) panic("pm", "do_reboot: unable to notify FS", r);
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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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PUBLIC int do_getsetpriority()
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{
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int arg_which, arg_who, arg_pri;
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int rmp_nr;
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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_nr = who_p;
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else
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if ((rmp_nr = proc_from_pid(arg_who)) < 0)
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return(ESRCH);
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rmp = &mproc[rmp_nr];
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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. Do it and tell kernel. */
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rmp->mp_nice = arg_pri;
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return sys_nice(rmp->mp_endpoint, arg_pri);
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}
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/*===========================================================================*
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* do_svrctl *
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*===========================================================================*/
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PUBLIC 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 MM? */
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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 MMSETPARAM:
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case MMGETPARAM: {
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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);
|
|
|
|
/* Set a param override? */
|
|
if (req == MMSETPARAM) {
|
|
if (local_params >= MAX_LOCAL_PARAMS) return ENOSPC;
|
|
if (sysgetenv.keylen <= 0
|
|
|| sysgetenv.keylen >=
|
|
sizeof(local_param_overrides[local_params].name)
|
|
|| sysgetenv.vallen <= 0
|
|
|| sysgetenv.vallen >=
|
|
sizeof(local_param_overrides[local_params].value))
|
|
return EINVAL;
|
|
|
|
if ((s = sys_datacopy(who_e, (vir_bytes) sysgetenv.key,
|
|
SELF, (vir_bytes) local_param_overrides[local_params].name,
|
|
sysgetenv.keylen)) != OK)
|
|
return s;
|
|
if ((s = sys_datacopy(who_e, (vir_bytes) sysgetenv.val,
|
|
SELF, (vir_bytes) local_param_overrides[local_params].value,
|
|
sysgetenv.vallen)) != OK)
|
|
return s;
|
|
local_param_overrides[local_params].name[sysgetenv.keylen] = '\0';
|
|
local_param_overrides[local_params].value[sysgetenv.vallen] = '\0';
|
|
|
|
local_params++;
|
|
|
|
return OK;
|
|
}
|
|
|
|
if (sysgetenv.keylen == 0) { /* copy all parameters */
|
|
val_start = monitor_params;
|
|
val_len = sizeof(monitor_params);
|
|
}
|
|
else { /* lookup value for key */
|
|
int p;
|
|
/* Try to get a copy of the requested key. */
|
|
if (sysgetenv.keylen > sizeof(search_key)) return(EINVAL);
|
|
if ((s = sys_datacopy(who_e, (vir_bytes) sysgetenv.key,
|
|
SELF, (vir_bytes) search_key, sysgetenv.keylen)) != OK)
|
|
return(s);
|
|
|
|
/* Make sure key is null-terminated and lookup value.
|
|
* First check local overrides.
|
|
*/
|
|
search_key[sysgetenv.keylen-1]= '\0';
|
|
for(p = 0; p < local_params; p++) {
|
|
if (!strcmp(search_key, local_param_overrides[p].name)) {
|
|
val_start = local_param_overrides[p].value;
|
|
break;
|
|
}
|
|
}
|
|
if (p >= local_params && (val_start = find_param(search_key)) == NULL)
|
|
return(ESRCH);
|
|
val_len = strlen(val_start) + 1;
|
|
}
|
|
|
|
/* See if it fits in the client's buffer. */
|
|
if (val_len > sysgetenv.vallen)
|
|
return E2BIG;
|
|
|
|
/* Value found, make the actual copy (as far as possible). */
|
|
copy_len = MIN(val_len, sysgetenv.vallen);
|
|
if ((s=sys_datacopy(SELF, (vir_bytes) val_start,
|
|
who_e, (vir_bytes) sysgetenv.val, copy_len)) != OK)
|
|
return(s);
|
|
|
|
return OK;
|
|
}
|
|
|
|
default:
|
|
return(EINVAL);
|
|
}
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* _brk *
|
|
*===========================================================================*/
|
|
|
|
extern char *_brksize;
|
|
PUBLIC int brk(brk_addr)
|
|
char *brk_addr;
|
|
{
|
|
int r;
|
|
/* PM wants to call brk() itself. */
|
|
if((r=vm_brk(PM_PROC_NR, brk_addr)) != OK) {
|
|
#if 0
|
|
printf("PM: own brk(%p) failed: vm_brk() returned %d\n",
|
|
brk_addr, r);
|
|
#endif
|
|
return -1;
|
|
}
|
|
_brksize = brk_addr;
|
|
return 0;
|
|
}
|
|
|