b423d7b477
o Support for ptrace T_ATTACH/T_DETACH and T_SYSCALL o PM signal handling logic should now work properly, even with debuggers being present o Asynchronous PM/VFS protocol, full IPC support for senda(), and AMF_NOREPLY senda() flag DETAILS Process stop and delay call handling of PM: o Added sys_runctl() kernel call with sys_stop() and sys_resume() aliases, for PM to stop and resume a process o Added exception for sending/syscall-traced processes to sys_runctl(), and matching SIGKREADY pseudo-signal to PM o Fixed PM signal logic to deal with requests from a process after stopping it (so-called "delay calls"), using the SIGKREADY facility o Fixed various PM panics due to race conditions with delay calls versus VFS calls o Removed special PRIO_STOP priority value o Added SYS_LOCK RTS kernel flag, to stop an individual process from running while modifying its process structure Signal and debugger handling in PM: o Fixed debugger signals being dropped if a second signal arrives when the debugger has not retrieved the first one o Fixed debugger signals being sent to the debugger more than once o Fixed debugger signals unpausing process in VFS; removed PM_UNPAUSE_TR protocol message o Detached debugger signals from general signal logic and from being blocked on VFS calls, meaning that even VFS can now be traced o Fixed debugger being unable to receive more than one pending signal in one process stop o Fixed signal delivery being delayed needlessly when multiple signals are pending o Fixed wait test for tracer, which was returning for children that were not waited for o Removed second parallel pending call from PM to VFS for any process o Fixed process becoming runnable between exec() and debugger trap o Added support for notifying the debugger before the parent when a debugged child exits o Fixed debugger death causing child to remain stopped forever o Fixed consistently incorrect use of _NSIG Extensions to ptrace(): o Added T_ATTACH and T_DETACH ptrace request, to attach and detach a debugger to and from a process o Added T_SYSCALL ptrace request, to trace system calls o Added T_SETOPT ptrace request, to set trace options o Added TO_TRACEFORK trace option, to attach automatically to children of a traced process o Added TO_ALTEXEC trace option, to send SIGSTOP instead of SIGTRAP upon a successful exec() of the tracee o Extended T_GETUSER ptrace support to allow retrieving a process's priv structure o Removed T_STOP ptrace request again, as it does not help implementing debuggers properly o Added MINIX3-specific ptrace test (test42) o Added proper manual page for ptrace(2) Asynchronous PM/VFS interface: o Fixed asynchronous messages not being checked when receive() is called with an endpoint other than ANY o Added AMF_NOREPLY senda() flag, preventing such messages from satisfying the receive part of a sendrec() o Added asynsend3() that takes optional flags; asynsend() is now a #define passing in 0 as third parameter o Made PM/VFS protocol asynchronous; reintroduced tell_fs() o Made PM_BASE request/reply number range unique o Hacked in a horrible temporary workaround into RS to deal with newly revealed RS-PM-VFS race condition triangle until VFS is asynchronous System signal handling: o Fixed shutdown logic of device drivers; removed old SIGKSTOP signal o Removed is-superuser check from PM's do_procstat() (aka getsigset()) o Added sigset macros to allow system processes to deal with the full signal set, rather than just the POSIX subset Miscellaneous PM fixes: o Split do_getset into do_get and do_set, merging common code and making structure clearer o Fixed setpriority() being able to put to sleep processes using an invalid parameter, or revive zombie processes o Made find_proc() global; removed obsolete proc_from_pid() o Cleanup here and there Also included: o Fixed false-positive boot order kernel warning o Removed last traces of old NOTIFY_FROM code THINGS OF POSSIBLE INTEREST o It should now be possible to run PM at any priority, even lower than user processes o No assumptions are made about communication speed between PM and VFS, although communication must be FIFO o A debugger will now receive incoming debuggee signals at kill time only; the process may not yet be fully stopped o A first step has been made towards making the SYSTEM task preemptible
120 lines
2.9 KiB
C
120 lines
2.9 KiB
C
/* This file handles the 6 system calls that get and set uids and gids.
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* It also handles getpid(), setsid(), and getpgrp(). The code for each
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* one is so tiny that it hardly seemed worthwhile to make each a separate
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* function.
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*/
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#include "pm.h"
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#include <minix/callnr.h>
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#include <minix/endpoint.h>
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#include <minix/com.h>
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#include <signal.h>
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#include "mproc.h"
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#include "param.h"
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/*===========================================================================*
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* do_get *
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*===========================================================================*/
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PUBLIC int do_get()
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{
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/* Handle GETUID, GETGID, GETPID, GETPGRP.
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*/
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register struct mproc *rmp = mp;
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int r, proc;
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switch(call_nr) {
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case GETUID:
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r = rmp->mp_realuid;
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rmp->mp_reply.reply_res2 = rmp->mp_effuid;
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if (pm_isokendpt(m_in.PM_ENDPT, &proc) == OK && proc >= 0)
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rmp->mp_reply.reply_res3 = mproc[proc].mp_effuid;
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break;
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case GETGID:
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r = rmp->mp_realgid;
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rmp->mp_reply.reply_res2 = rmp->mp_effgid;
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if (pm_isokendpt(m_in.PM_ENDPT, &proc) == OK && proc >= 0)
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rmp->mp_reply.reply_res3 = mproc[proc].mp_effgid;
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break;
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case MINIX_GETPID:
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r = mproc[who_p].mp_pid;
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rmp->mp_reply.reply_res2 = mproc[rmp->mp_parent].mp_pid;
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if(pm_isokendpt(m_in.PM_ENDPT, &proc) == OK && proc >= 0)
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rmp->mp_reply.reply_res3 = mproc[proc].mp_pid;
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break;
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case GETPGRP:
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r = rmp->mp_procgrp;
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break;
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default:
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r = EINVAL;
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break;
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}
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return(r);
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}
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/*===========================================================================*
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* do_set *
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*===========================================================================*/
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PUBLIC int do_set()
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{
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/* Handle SETUID, SETEUID, SETGID, SETEGID, SETSID. These calls have in common
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* that, if successful, they will be forwarded to VFS as well.
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*/
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register struct mproc *rmp = mp;
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message m;
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int r;
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switch(call_nr) {
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case SETUID:
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case SETEUID:
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if (rmp->mp_realuid != (uid_t) m_in.usr_id &&
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rmp->mp_effuid != SUPER_USER)
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return(EPERM);
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if(call_nr == SETUID) rmp->mp_realuid = (uid_t) m_in.usr_id;
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rmp->mp_effuid = (uid_t) m_in.usr_id;
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m.m_type = PM_SETUID;
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m.PM_PROC = rmp->mp_endpoint;
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m.PM_EID = rmp->mp_effuid;
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m.PM_RID = rmp->mp_realuid;
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break;
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case SETGID:
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case SETEGID:
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if (rmp->mp_realgid != (gid_t) m_in.grp_id &&
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rmp->mp_effuid != SUPER_USER)
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return(EPERM);
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if(call_nr == SETGID) rmp->mp_realgid = (gid_t) m_in.grp_id;
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rmp->mp_effgid = (gid_t) m_in.grp_id;
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m.m_type = PM_SETGID;
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m.PM_PROC = rmp->mp_endpoint;
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m.PM_EID = rmp->mp_effgid;
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m.PM_RID = rmp->mp_realgid;
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break;
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case SETSID:
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if (rmp->mp_procgrp == rmp->mp_pid) return(EPERM);
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rmp->mp_procgrp = rmp->mp_pid;
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m.m_type = PM_SETSID;
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m.PM_PROC = rmp->mp_endpoint;
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break;
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default:
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return(EINVAL);
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}
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/* Send the request to FS */
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tell_fs(rmp, &m);
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/* Do not reply until FS has processed the request */
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return(SUSPEND);
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}
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