b8b8f537bd
Kernel: o Remove s_ipc_sendrec, instead using s_ipc_to for all send primitives o Centralize s_ipc_to bit manipulation, - disallowing assignment of bits pointing to unused priv structs; - preventing send-to-self by not setting bit for own priv struct; - preserving send mask matrix symmetry in all cases o Add IPC send mask checks to SENDA, which were missing entirely somehow o Slightly improve IPC stats accounting for SENDA o Remove SYSTEM from user processes' send mask o Half-fix the dependency between boot image order and process numbers, - correcting the table order of the boot processes; - documenting the order requirement needed for proper send masks; - warning at boot time if the order is violated RS: o Add support in /etc/drivers.conf for servers that talk to user processes, - disallowing IPC to user processes if no "ipc" field is present - adding a special "USER" label to explicitly allow IPC to user processes o Always apply IPC masks when specified; remove -i flag from service(8) o Use kernel send mask symmetry to delay adding IPC permissions for labels that do not exist yet, adding them to that label's process upon creation o Add VM to ipc permissions list for rtl8139 and fxp in drivers.conf Left to future fixes: o Removal of the table order vs process numbers dependency altogether, possibly using per-process send list structures as used for SYSTEM calls o Proper assignment of send masks to boot processes; some of the assigned (~0) masks are much wider than necessary o Proper assignment of IPC send masks for many more servers in drivers.conf o Removal of the debugging warning about the now legitimate case where RS's add_forward_ipc cannot find the IPC destination's label yet
103 lines
3.6 KiB
C
Executable file
103 lines
3.6 KiB
C
Executable file
#ifndef PRIV_H
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#define PRIV_H
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/* Declaration of the system privileges structure. It defines flags, system
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* call masks, an synchronous alarm timer, I/O privileges, pending hardware
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* interrupts and notifications, and so on.
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* System processes each get their own structure with properties, whereas all
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* user processes share one structure. This setup provides a clear separation
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* between common and privileged process fields and is very space efficient.
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*
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* Changes:
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* Jul 01, 2005 Created. (Jorrit N. Herder)
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*/
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#include <minix/com.h>
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#include "const.h"
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#include "type.h"
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/* Max. number of I/O ranges that can be assigned to a process */
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#define NR_IO_RANGE 32
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/* Max. number of device memory ranges that can be assigned to a process */
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#define NR_MEM_RANGE 10
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/* Max. number of IRQs that can be assigned to a process */
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#define NR_IRQ 4
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struct priv {
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proc_nr_t s_proc_nr; /* number of associated process */
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sys_id_t s_id; /* index of this system structure */
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short s_flags; /* PREEMTIBLE, BILLABLE, etc. */
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/* Asynchronous sends */
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vir_bytes s_asyntab; /* addr. of table in process' address space */
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size_t s_asynsize; /* number of elements in table. 0 when not in
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* use
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*/
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short s_trap_mask; /* allowed system call traps */
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sys_map_t s_ipc_to; /* allowed destination processes */
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/* allowed kernel calls */
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#define CALL_MASK_SIZE BITMAP_CHUNKS(NR_SYS_CALLS)
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bitchunk_t s_k_call_mask[CALL_MASK_SIZE];
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sys_map_t s_notify_pending; /* bit map with pending notifications */
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irq_id_t s_int_pending; /* pending hardware interrupts */
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sigset_t s_sig_pending; /* pending signals */
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timer_t s_alarm_timer; /* synchronous alarm timer */
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struct far_mem s_farmem[NR_REMOTE_SEGS]; /* remote memory map */
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reg_t *s_stack_guard; /* stack guard word for kernel tasks */
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int s_nr_io_range; /* allowed I/O ports */
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struct io_range s_io_tab[NR_IO_RANGE];
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int s_nr_mem_range; /* allowed memory ranges */
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struct mem_range s_mem_tab[NR_MEM_RANGE];
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int s_nr_irq; /* allowed IRQ lines */
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int s_irq_tab[NR_IRQ];
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vir_bytes s_grant_table; /* grant table address of process, or 0 */
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int s_grant_entries; /* no. of entries, or 0 */
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};
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/* Guard word for task stacks. */
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#define STACK_GUARD ((reg_t) (sizeof(reg_t) == 2 ? 0xBEEF : 0xDEADBEEF))
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/* Magic system structure table addresses. */
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#define BEG_PRIV_ADDR (&priv[0])
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#define END_PRIV_ADDR (&priv[NR_SYS_PROCS])
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#define priv_addr(i) (ppriv_addr)[(i)]
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#define priv_id(rp) ((rp)->p_priv->s_id)
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#define priv(rp) ((rp)->p_priv)
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#define id_to_nr(id) priv_addr(id)->s_proc_nr
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#define nr_to_id(nr) priv(proc_addr(nr))->s_id
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#define may_send_to(rp, nr) (get_sys_bit(priv(rp)->s_ipc_to, nr_to_id(nr)))
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/* The system structures table and pointers to individual table slots. The
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* pointers allow faster access because now a process entry can be found by
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* indexing the psys_addr array, while accessing an element i requires a
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* multiplication with sizeof(struct sys) to determine the address.
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*/
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EXTERN struct priv priv[NR_SYS_PROCS]; /* system properties table */
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EXTERN struct priv *ppriv_addr[NR_SYS_PROCS]; /* direct slot pointers */
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/* Unprivileged user processes all share the same privilege structure.
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* This id must be fixed because it is used to check send mask entries.
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*/
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#define USER_PRIV_ID 0
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/* Make sure the system can boot. The following sanity check verifies that
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* the system privileges table is large enough for the number of processes
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* in the boot image.
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*/
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#if (NR_BOOT_PROCS > NR_SYS_PROCS)
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#error NR_SYS_PROCS must be larger than NR_BOOT_PROCS
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#endif
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#endif /* PRIV_H */
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