#include <sys/ubc.h>
#include <kern/kalloc.h>
#include <kern/task.h>
+#include <kern/coalition.h>
+#include <sys/coalition.h>
#include <kern/assert.h>
#include <vm/vm_protos.h>
#include <vm/vm_map.h> /* vm_map_switch_protect() */
+#include <vm/vm_pageout.h>
#include <mach/task.h>
#include <mach/message.h>
+#include <sys/priv.h>
+#include <sys/proc_info.h>
+#include <sys/bsdtask_info.h>
+
+#if CONFIG_MEMORYSTATUS
+#include <sys/kern_memorystatus.h>
+#endif
#if CONFIG_MACF
#include <security/mac_framework.h>
static void lctxinit(void);
#endif
-int cs_debug; /* declared further down in this file */
+extern int cs_debug;
#if DEBUG
#define __PROC_INTERNAL_DEBUG 1
#endif
/* Name to give to core files */
-__private_extern__ char corefilename[MAXPATHLEN+1] = {"/cores/core.%P"};
+__XNU_PRIVATE_EXTERN char corefilename[MAXPATHLEN+1] = {"/cores/core.%P"};
static void orphanpg(struct pgrp *pg);
void proc_name_kdp(task_t t, char * buf, int size);
+int proc_threadname_kdp(void *uth, char *buf, size_t size);
+void proc_starttime_kdp(void *p, uint64_t *tv_sec, uint64_t *tv_usec);
char *proc_name_address(void *p);
static void pgrp_add(struct pgrp * pgrp, proc_t parent, proc_t child);
static void pgdelete_dropref(struct pgrp *pgrp);
extern void pg_rele_dropref(struct pgrp * pgrp);
static int csops_internal(pid_t pid, int ops, user_addr_t uaddr, user_size_t usersize, user_addr_t uaddittoken);
+static boolean_t proc_parent_is_currentproc(proc_t p);
struct fixjob_iterargs {
struct pgrp * pg;
proc_t
proc_find_zombref(int pid)
{
- proc_t p1 = PROC_NULL;
- proc_t p = PROC_NULL;
+ proc_t p;
proc_list_lock();
+ again:
p = pfind_locked(pid);
- /* if process still in creation return NULL */
- if ((p == PROC_NULL) || ((p->p_listflag & P_LIST_INCREATE) != 0)) {
+ /* should we bail? */
+ if ((p == PROC_NULL) /* not found */
+ || ((p->p_listflag & P_LIST_INCREATE) != 0) /* not created yet */
+ || ((p->p_listflag & P_LIST_EXITED) == 0)) { /* not started exit */
+
proc_list_unlock();
- return (p1);
+ return (PROC_NULL);
}
- /* if process has not started exit or is being reaped, return NULL */
- if (((p->p_listflag & P_LIST_EXITED) != 0) && ((p->p_listflag & P_LIST_WAITING) == 0)) {
- p->p_listflag |= P_LIST_WAITING;
- p1 = p;
- } else
- p1 = PROC_NULL;
+ /* If someone else is controlling the (unreaped) zombie - wait */
+ if ((p->p_listflag & P_LIST_WAITING) != 0) {
+ (void)msleep(&p->p_stat, proc_list_mlock, PWAIT, "waitcoll", 0);
+ goto again;
+ }
+ p->p_listflag |= P_LIST_WAITING;
proc_list_unlock();
- return(p1);
+ return(p);
}
void
int
proc_pid(proc_t p)
{
- return(p->p_pid);
+ return (p->p_pid);
}
int
proc_ppid(proc_t p)
{
- return(p->p_ppid);
+ return (p->p_ppid);
}
-int
+int
proc_selfpid(void)
{
- proc_t p = current_proc();
- return(p->p_pid);
+ return (current_proc()->p_pid);
}
-int
+int
proc_selfppid(void)
{
- proc_t p = current_proc();
- return(p->p_ppid);
+ return (current_proc()->p_ppid);
+}
+
+#if CONFIG_DTRACE
+static proc_t
+dtrace_current_proc_vforking(void)
+{
+ thread_t th = current_thread();
+ struct uthread *ut = get_bsdthread_info(th);
+
+ if (ut &&
+ ((ut->uu_flag & (UT_VFORK|UT_VFORKING)) == (UT_VFORK|UT_VFORKING))) {
+ /*
+ * Handle the narrow window where we're in the vfork syscall,
+ * but we're not quite ready to claim (in particular, to DTrace)
+ * that we're running as the child.
+ */
+ return (get_bsdtask_info(get_threadtask(th)));
+ }
+ return (current_proc());
+}
+
+int
+dtrace_proc_selfpid(void)
+{
+ return (dtrace_current_proc_vforking()->p_pid);
}
+int
+dtrace_proc_selfppid(void)
+{
+ return (dtrace_current_proc_vforking()->p_ppid);
+}
+
+uid_t
+dtrace_proc_selfruid(void)
+{
+ return (dtrace_current_proc_vforking()->p_ruid);
+}
+#endif /* CONFIG_DTRACE */
+
proc_t
proc_parent(proc_t p)
{
return(parent);
}
+static boolean_t
+proc_parent_is_currentproc(proc_t p)
+{
+ boolean_t ret = FALSE;
+
+ proc_list_lock();
+ if (p->p_pptr == current_proc())
+ ret = TRUE;
+
+ proc_list_unlock();
+ return ret;
+}
void
proc_name(int pid, char * buf, int size)
strlcpy(buf, &p->p_comm[0], size);
}
+
+int
+proc_threadname_kdp(void *uth, char *buf, size_t size)
+{
+ if (size < MAXTHREADNAMESIZE) {
+ /* this is really just a protective measure for the future in
+ * case the thread name size in stackshot gets out of sync with
+ * the BSD max thread name size. Note that bsd_getthreadname
+ * doesn't take input buffer size into account. */
+ return -1;
+ }
+
+ if (uth != NULL) {
+ bsd_getthreadname(uth, buf);
+ }
+ return 0;
+}
+
+/* note that this function is generally going to be called from stackshot,
+ * and the arguments will be coming from a struct which is declared packed
+ * thus the input arguments will in general be unaligned. We have to handle
+ * that here. */
+void
+proc_starttime_kdp(void *p, uint64_t *tv_sec, uint64_t *tv_usec)
+{
+ proc_t pp = (proc_t)p;
+ struct uint64p {
+ uint64_t val;
+ } __attribute__((packed));
+
+ if (pp != PROC_NULL) {
+ if (tv_sec != NULL)
+ ((struct uint64p *)tv_sec)->val = pp->p_start.tv_sec;
+ if (tv_usec != NULL)
+ ((struct uint64p *)tv_usec)->val = pp->p_start.tv_usec;
+ }
+}
+
char *
proc_name_address(void *p)
{
}
-int
-proc_tbe(proc_t p)
-{
- int retval = 0;
-
- if (p)
- retval = p->p_flag & P_TBE;
- return(retval? 1: 0);
-
-}
-
int
proc_suser(proc_t p)
{
}
uint64_t
-proc_selfuniqueid(void)
+proc_puniqueid(proc_t p)
{
- proc_t p = current_proc();
- return(p->p_uniqueid);
+ return(p->p_puniqueid);
+}
+
+uint64_t
+proc_coalitionid(__unused proc_t p)
+{
+#if CONFIG_COALITIONS
+ return(task_coalition_id(p->task));
+#else
+ return 0;
+#endif
+}
+
+uint64_t
+proc_was_throttled(proc_t p)
+{
+ return (p->was_throttled);
+}
+
+uint64_t
+proc_did_throttle(proc_t p)
+{
+ return (p->did_throttle);
}
int
}
}
+/* Return vnode for executable with an iocount. Must be released with vnode_put() */
+vnode_t
+proc_getexecutablevnode(proc_t p)
+{
+ vnode_t tvp = p->p_textvp;
+
+ if ( tvp != NULLVP) {
+ if (vnode_getwithref(tvp) == 0) {
+ return tvp;
+ }
+ }
+
+ return NULLVP;
+}
+
void
bsd_set_dependency_capable(task_t task)
TAILQ_INIT(&child->p_evlist);
child->p_pptr = parent;
child->p_ppid = parent->p_pid;
+ child->p_puniqueid = parent->p_uniqueid;
pg = proc_pgrp(parent);
pgrp_add(pg, parent, child);
pg_rele(pg);
proc_list_lock();
+
+#if CONFIG_MEMORYSTATUS
+ memorystatus_add(child, TRUE);
+#endif
+
parent->p_childrencnt++;
LIST_INSERT_HEAD(&parent->p_children, child, p_sibling);
child->p_listflag &= ~P_LIST_INCREATE;
proc_list_unlock();
-
}
/*
struct session *mysession = pgrp->pg_session;
proc_t parent;
struct fixjob_iterargs fjarg;
+ boolean_t proc_parent_self;
+
+ /*
+ * Check if p's parent is current proc, if yes then no need to take
+ * a ref; calling proc_parent with current proc as parent may
+ * deadlock if current proc is exiting.
+ */
+ proc_parent_self = proc_parent_is_currentproc(p);
+ if (proc_parent_self)
+ parent = current_proc();
+ else
+ parent = proc_parent(p);
- parent = proc_parent(p);
if (parent != PROC_NULL) {
hispgrp = proc_pgrp(parent);
hissess = proc_session(parent);
- proc_rele(parent);
+ if (!proc_parent_self)
+ proc_rele(parent);
}
return (current_proc());
}
+int
+proc_is_forcing_hfs_case_sensitivity(proc_t p)
+{
+ return (p->p_vfs_iopolicy & P_VFS_IOPOLICY_FORCE_HFS_CASE_SENSITIVITY) ? 1 : 0;
+}
+
/*
* proc_core_name(name, uid, pid)
* Expand the name described in corefilename, using name, uid, and pid.
{
if (uap->uaudittoken == USER_ADDR_NULL)
return(EINVAL);
- switch (uap->ops) {
- case CS_OPS_PIDPATH:
- case CS_OPS_ENTITLEMENTS_BLOB:
- break;
- default:
- return(EINVAL);
- };
-
return(csops_internal(uap->pid, uap->ops, uap->useraddr,
uap->usersize, uap->uaudittoken));
}
+static int
+csops_copy_token(void *start, size_t length, user_size_t usize, user_addr_t uaddr)
+{
+ char fakeheader[8] = { 0 };
+ int error;
+
+ if (usize < sizeof(fakeheader))
+ return ERANGE;
+
+ /* if no blob, fill in zero header */
+ if (NULL == start) {
+ start = fakeheader;
+ length = sizeof(fakeheader);
+ } else if (usize < length) {
+ /* ... if input too short, copy out length of entitlement */
+ uint32_t length32 = htonl((uint32_t)length);
+ memcpy(&fakeheader[4], &length32, sizeof(length32));
+
+ error = copyout(fakeheader, uaddr, sizeof(fakeheader));
+ if (error == 0)
+ return ERANGE; /* input buffer to short, ERANGE signals that */
+ return error;
+ }
+ return copyout(start, uaddr, length);
+}
+
static int
csops_internal(pid_t pid, int ops, user_addr_t uaddr, user_size_t usersize, user_addr_t uaudittoken)
{
size_t usize = (size_t)CAST_DOWN(size_t, usersize);
proc_t pt;
- uint32_t retflags;
- int vid, forself;
+ int forself;
int error;
vnode_t tvp;
off_t toff;
- char * buf;
unsigned char cdhash[SHA1_RESULTLEN];
audit_token_t token;
unsigned int upid=0, uidversion = 0;
forself = 1;
- /* Pre flight checks for CS_OPS_PIDPATH */
- if (ops == CS_OPS_PIDPATH) {
- /* usize is unsigned.. */
- if (usize > 4 * PATH_MAX)
- return(EOVERFLOW);
- if (kauth_cred_issuser(kauth_cred_get()) != TRUE)
- return(EPERM);
- } else {
- switch (ops) {
+ switch (ops) {
case CS_OPS_STATUS:
case CS_OPS_CDHASH:
case CS_OPS_PIDOFFSET:
case CS_OPS_ENTITLEMENTS_BLOB:
+ case CS_OPS_IDENTITY:
+ case CS_OPS_BLOB:
break; /* unrestricted */
default:
if (forself == 0 && kauth_cred_issuser(kauth_cred_get()) != TRUE)
return(EPERM);
break;
- }
}
pt = proc_find(pid);
switch (ops) {
- case CS_OPS_STATUS:
+ case CS_OPS_STATUS: {
+ uint32_t retflags;
+
+ proc_lock(pt);
retflags = pt->p_csflags;
+ if (cs_enforcement(pt))
+ retflags |= CS_ENFORCEMENT;
+ proc_unlock(pt);
+
if (uaddr != USER_ADDR_NULL)
error = copyout(&retflags, uaddr, sizeof(uint32_t));
break;
-
+ }
case CS_OPS_MARKINVALID:
proc_lock(pt);
if ((pt->p_csflags & CS_VALID) == CS_VALID) { /* is currently valid */
proc_unlock(pt);
break;
- case CS_OPS_PIDPATH:
- tvp = pt->p_textvp;
- vid = vnode_vid(tvp);
-
- if (tvp == NULLVP) {
- proc_rele(pt);
- return(EINVAL);
- }
-
- buf = (char *)kalloc(usize);
- if (buf == NULL) {
- proc_rele(pt);
- return(ENOMEM);
- }
- bzero(buf, usize);
-
- error = vnode_getwithvid(tvp, vid);
- if (error == 0) {
- int len;
- len = usize;
- error = vn_getpath(tvp, buf, &len);
- vnode_put(tvp);
- if (error == 0) {
- error = copyout(buf, uaddr, usize);
- }
- kfree(buf, usize);
- }
-
- proc_rele(pt);
-
- return(error);
-
case CS_OPS_PIDOFFSET:
toff = pt->p_textoff;
proc_rele(pt);
return error;
case CS_OPS_ENTITLEMENTS_BLOB: {
- char fakeheader[8] = { 0 };
void *start;
size_t length;
+ proc_lock(pt);
+
if ((pt->p_csflags & CS_VALID) == 0) {
+ proc_unlock(pt);
error = EINVAL;
break;
}
- if (usize < sizeof(fakeheader)) {
+
+ error = cs_entitlements_blob_get(pt, &start, &length);
+ proc_unlock(pt);
+ if (error)
+ break;
+
+ error = csops_copy_token(start, length, usize, uaddr);
+ break;
+ }
+ case CS_OPS_MARKRESTRICT:
+ proc_lock(pt);
+ pt->p_csflags |= CS_RESTRICT;
+ proc_unlock(pt);
+ break;
+
+ case CS_OPS_SET_STATUS: {
+ uint32_t flags;
+
+ if (usize < sizeof(flags)) {
error = ERANGE;
break;
}
- if (0 != (error = cs_entitlements_blob_get(pt,
- &start, &length)))
+
+ error = copyin(uaddr, &flags, sizeof(flags));
+ if (error)
break;
- /* if no entitlement, fill in zero header */
- if (NULL == start) {
- start = fakeheader;
- length = sizeof(fakeheader);
- } else if (usize < length) {
- /* ... if input too short, copy out length of entitlement */
- uint32_t length32 = htonl((uint32_t)length);
- memcpy(&fakeheader[4], &length32, sizeof(length32));
-
- error = copyout(fakeheader, uaddr, sizeof(fakeheader));
- if (error == 0)
- error = ERANGE; /* input buffer to short, ERANGE signals that */
+
+ /* only allow setting a subset of all code sign flags */
+ flags &=
+ CS_HARD | CS_EXEC_SET_HARD |
+ CS_KILL | CS_EXEC_SET_KILL |
+ CS_RESTRICT |
+ CS_REQUIRE_LV |
+ CS_ENFORCEMENT | CS_EXEC_SET_ENFORCEMENT |
+ CS_ENTITLEMENTS_VALIDATED;
+
+ proc_lock(pt);
+ if (pt->p_csflags & CS_VALID)
+ pt->p_csflags |= flags;
+ else
+ error = EINVAL;
+ proc_unlock(pt);
+
+ break;
+ }
+ case CS_OPS_BLOB: {
+ void *start;
+ size_t length;
+
+ proc_lock(pt);
+ if ((pt->p_csflags & CS_VALID) == 0) {
+ proc_unlock(pt);
+ error = EINVAL;
break;
}
- error = copyout(start, uaddr, length);
+
+ error = cs_blob_get(pt, &start, &length);
+ proc_unlock(pt);
+ if (error)
+ break;
+
+ error = csops_copy_token(start, length, usize, uaddr);
break;
}
+ case CS_OPS_IDENTITY: {
+ const char *identity;
+ uint8_t fakeheader[8];
+ uint32_t idlen;
+ size_t length;
+
+ /*
+ * Make identity have a blob header to make it
+ * easier on userland to guess the identity
+ * length.
+ */
+ if (usize < sizeof(fakeheader)) {
+ error = ERANGE;
+ break;
+ }
+ memset(fakeheader, 0, sizeof(fakeheader));
- case CS_OPS_MARKRESTRICT:
proc_lock(pt);
- pt->p_csflags |= CS_RESTRICT;
+ if ((pt->p_csflags & CS_VALID) == 0) {
+ proc_unlock(pt);
+ error = EINVAL;
+ break;
+ }
+
+ identity = cs_identity_get(pt);
proc_unlock(pt);
+ if (identity == NULL) {
+ error = ENOENT;
+ break;
+ }
+
+ length = strlen(identity) + 1; /* include NUL */
+ idlen = htonl(length + sizeof(fakeheader));
+ memcpy(&fakeheader[4], &idlen, sizeof(idlen));
+
+ error = copyout(fakeheader, uaddr, sizeof(fakeheader));
+ if (error)
+ break;
+
+ if (usize < sizeof(fakeheader) + length)
+ error = ERANGE;
+ else if (usize > sizeof(fakeheader))
+ error = copyout(identity, uaddr + sizeof(fakeheader), length);
+
+ break;
+ }
+
+ case CS_OPS_SIGPUP_INSTALL:
+ error = sigpup_install(uaddr);
+ break;
+
+ case CS_OPS_SIGPUP_DROP:
+ error = sigpup_drop();
break;
default:
switch (retval) {
case PROC_RETURNED:
+ proc_rele(p);
+ break;
case PROC_RETURNED_DONE:
proc_rele(p);
- if (retval == PROC_RETURNED_DONE) {
- goto out;
- }
- break;
-
+ goto out;
case PROC_CLAIMED_DONE:
goto out;
case PROC_CLAIMED:
switch (retval) {
case PROC_RETURNED:
+ proc_drop_zombref(p);
+ break;
case PROC_RETURNED_DONE:
proc_drop_zombref(p);
- if (retval == PROC_RETURNED_DONE) {
- goto out;
- }
- break;
-
+ goto out;
case PROC_CLAIMED_DONE:
goto out;
case PROC_CLAIMED:
}
int
-proc_transstart(proc_t p, int locked)
+proc_transstart(proc_t p, int locked, int non_blocking)
{
if (locked == 0)
proc_lock(p);
while ((p->p_lflag & P_LINTRANSIT) == P_LINTRANSIT) {
- if ((p->p_lflag & P_LTRANSCOMMIT) == P_LTRANSCOMMIT) {
+ if (((p->p_lflag & P_LTRANSCOMMIT) == P_LTRANSCOMMIT) || non_blocking) {
if (locked == 0)
proc_unlock(p);
return EDEADLK;
proc_klist_unlock();
}
-unsigned long cs_procs_killed = 0;
-unsigned long cs_procs_invalidated = 0;
-int cs_force_kill = 0;
-int cs_force_hard = 0;
-int cs_debug = 0;
-SYSCTL_INT(_vm, OID_AUTO, cs_force_kill, CTLFLAG_RW | CTLFLAG_LOCKED, &cs_force_kill, 0, "");
-SYSCTL_INT(_vm, OID_AUTO, cs_force_hard, CTLFLAG_RW | CTLFLAG_LOCKED, &cs_force_hard, 0, "");
-SYSCTL_INT(_vm, OID_AUTO, cs_debug, CTLFLAG_RW | CTLFLAG_LOCKED, &cs_debug, 0, "");
-
-int
-cs_allow_invalid(struct proc *p)
-{
-#if MACH_ASSERT
- lck_mtx_assert(&p->p_mlock, LCK_MTX_ASSERT_NOTOWNED);
-#endif
-#if CONFIG_MACF && CONFIG_ENFORCE_SIGNED_CODE
- /* There needs to be a MAC policy to implement this hook, or else the
- * kill bits will be cleared here every time. If we have
- * CONFIG_ENFORCE_SIGNED_CODE, we can assume there is a policy
- * implementing the hook.
- */
- if( 0 != mac_proc_check_run_cs_invalid(p)) {
- if(cs_debug) printf("CODE SIGNING: cs_allow_invalid() "
- "not allowed: pid %d\n",
- p->p_pid);
- return 0;
- }
- if(cs_debug) printf("CODE SIGNING: cs_allow_invalid() "
- "allowed: pid %d\n",
- p->p_pid);
- proc_lock(p);
- p->p_csflags &= ~(CS_KILL | CS_HARD | CS_VALID);
- proc_unlock(p);
- vm_map_switch_protect(get_task_map(p->task), FALSE);
-#endif
- return (p->p_csflags & (CS_KILL | CS_HARD)) == 0;
-}
-
-int
-cs_invalid_page(
- addr64_t vaddr)
-{
- struct proc *p;
- int retval;
-
- p = current_proc();
-
- /*
- * XXX revisit locking when proc is no longer protected
- * by the kernel funnel...
- */
-
- /* XXX for testing */
- proc_lock(p);
- if (cs_force_kill)
- p->p_csflags |= CS_KILL;
- if (cs_force_hard)
- p->p_csflags |= CS_HARD;
-
- /* CS_KILL triggers us to send a kill signal. Nothing else. */
- if (p->p_csflags & CS_KILL) {
- p->p_csflags |= CS_KILLED;
- proc_unlock(p);
- if (cs_debug) {
- printf("CODE SIGNING: cs_invalid_page(0x%llx): "
- "p=%d[%s] honoring CS_KILL, final status 0x%x\n",
- vaddr, p->p_pid, p->p_comm, p->p_csflags);
- }
- cs_procs_killed++;
- psignal(p, SIGKILL);
- proc_lock(p);
- }
-
- /* CS_HARD means fail the mapping operation so the process stays valid. */
- if (p->p_csflags & CS_HARD) {
- proc_unlock(p);
- if (cs_debug) {
- printf("CODE SIGNING: cs_invalid_page(0x%llx): "
- "p=%d[%s] honoring CS_HARD\n",
- vaddr, p->p_pid, p->p_comm);
- }
- retval = 1;
- } else {
- if (p->p_csflags & CS_VALID) {
- p->p_csflags &= ~CS_VALID;
-
- proc_unlock(p);
- cs_procs_invalidated++;
- printf("CODE SIGNING: cs_invalid_page(0x%llx): "
- "p=%d[%s] clearing CS_VALID\n",
- vaddr, p->p_pid, p->p_comm);
- } else {
- proc_unlock(p);
- }
-
- retval = 0;
- }
-
- return retval;
-}
-
void
proc_setregister(proc_t p)
{
}
int
-proc_dopcontrol(proc_t p, void *num_found)
+proc_dopcontrol(proc_t p)
{
int pcontrol;
pcontrol = PROC_CONTROL_STATE(p);
- if (PROC_ACTION_STATE(p) ==0) {
+ if (PROC_ACTION_STATE(p) == 0) {
switch(pcontrol) {
case P_PCTHROTTLE:
PROC_SETACTION_STATE(p);
proc_unlock(p);
printf("low swap: throttling pid %d (%s)\n", p->p_pid, p->p_comm);
- (*(int *)num_found)++;
break;
case P_PCSUSP:
proc_unlock(p);
printf("low swap: suspending pid %d (%s)\n", p->p_pid, p->p_comm);
task_suspend(p->task);
- (*(int *)num_found)++;
break;
case P_PCKILL:
proc_unlock(p);
printf("low swap: killing pid %d (%s)\n", p->p_pid, p->p_comm);
psignal(p, SIGKILL);
- (*(int *)num_found)++;
break;
default:
}
-/*
- * Return true if the specified process has an action state specified for it and it isn't
- * already in an action state and it's using more physical memory than the specified threshold.
- * Note: the memory_threshold argument is specified in bytes and is of type uint64_t.
- */
+
+struct no_paging_space
+{
+ uint64_t pcs_max_size;
+ uint64_t pcs_uniqueid;
+ int pcs_pid;
+ int pcs_proc_count;
+ uint64_t pcs_total_size;
+
+ uint64_t npcs_max_size;
+ uint64_t npcs_uniqueid;
+ int npcs_pid;
+ int npcs_proc_count;
+ uint64_t npcs_total_size;
+
+ int apcs_proc_count;
+ uint64_t apcs_total_size;
+};
+
static int
-proc_pcontrol_filter(proc_t p, void *memory_thresholdp)
+proc_pcontrol_filter(proc_t p, void *arg)
{
-
- return PROC_CONTROL_STATE(p) && /* if there's an action state specified... */
- (PROC_ACTION_STATE(p) == 0) && /* and we're not in the action state yet... */
- (get_task_resident_size(p->task) > *((uint64_t *)memory_thresholdp)); /* and this proc is over the mem threshold, */
- /* then return true to take action on this proc */
+ struct no_paging_space *nps;
+ uint64_t compressed;
+
+ nps = (struct no_paging_space *)arg;
+
+ compressed = get_task_compressed(p->task);
+
+ if (PROC_CONTROL_STATE(p)) {
+ if (PROC_ACTION_STATE(p) == 0) {
+ if (compressed > nps->pcs_max_size) {
+ nps->pcs_pid = p->p_pid;
+ nps->pcs_uniqueid = p->p_uniqueid;
+ nps->pcs_max_size = compressed;
+ }
+ nps->pcs_total_size += compressed;
+ nps->pcs_proc_count++;
+ } else {
+ nps->apcs_total_size += compressed;
+ nps->apcs_proc_count++;
+ }
+ } else {
+ if (compressed > nps->npcs_max_size) {
+ nps->npcs_pid = p->p_pid;
+ nps->npcs_uniqueid = p->p_uniqueid;
+ nps->npcs_max_size = compressed;
+ }
+ nps->npcs_total_size += compressed;
+ nps->npcs_proc_count++;
+
+ }
+ return (0);
}
+static int
+proc_pcontrol_null(__unused proc_t p, __unused void *arg)
+{
+ return(PROC_RETURNED);
+}
+
/*
- * Deal with the out of swap space condition. This routine gets called when
- * we want to swap something out but there's no more space left. Since this
- * creates a memory deadlock situtation, we need to take action to free up
- * some memory resources in order to prevent the system from hanging completely.
- * The action we take is based on what the system processes running at user level
- * have specified. Processes are marked in one of four categories: ones that
- * can be killed immediately, ones that should be suspended, ones that should
- * be throttled, and all the rest which are basically none of the above. Which
- * processes are marked as being in which category is a user level policy decision;
- * we just take action based on those decisions here.
+ * Deal with the low on compressor pool space condition... this function
+ * gets called when we are approaching the limits of the compressor pool or
+ * we are unable to create a new swap file.
+ * Since this eventually creates a memory deadlock situtation, we need to take action to free up
+ * memory resources (both compressed and uncompressed) in order to prevent the system from hanging completely.
+ * There are 2 categories of processes to deal with. Those that have an action
+ * associated with them by the task itself and those that do not. Actionable
+ * tasks can have one of three categories specified: ones that
+ * can be killed immediately, ones that should be suspended, and ones that should
+ * be throttled. Processes that do not have an action associated with them are normally
+ * ignored unless they are utilizing such a large percentage of the compressor pool (currently 50%)
+ * that only by killing them can we hope to put the system back into a usable state.
*/
-#define STARTING_PERCENTAGE 50 /* memory threshold expressed as a percentage */
- /* of physical memory */
+#define NO_PAGING_SPACE_DEBUG 0
+
+extern uint64_t vm_compressor_pages_compressed(void);
struct timeval last_no_space_action = {0, 0};
-void
-no_paging_space_action(void)
+int
+no_paging_space_action()
{
-
- uint64_t memory_threshold;
- int num_found;
+ proc_t p;
+ struct no_paging_space nps;
struct timeval now;
/*
- * Throttle how often we come through here. Once every 20 seconds should be plenty.
+ * Throttle how often we come through here. Once every 5 seconds should be plenty.
*/
-
microtime(&now);
- if (now.tv_sec <= last_no_space_action.tv_sec + 20)
- return;
-
- last_no_space_action = now;
+ if (now.tv_sec <= last_no_space_action.tv_sec + 5)
+ return (0);
/*
- * Examine all processes and find those that have been marked to have some action
- * taken when swap space runs out. Of those processes, select one or more and
- * apply the specified action to them. The idea is to only take action against
- * a few processes rather than hitting too many at once. If the low swap condition
- * persists, this routine will get called again and we'll take action against more
- * processes.
+ * Examine all processes and find the biggest (biggest is based on the number of pages this
+ * task has in the compressor pool) that has been marked to have some action
+ * taken when swap space runs out... we also find the biggest that hasn't been marked for
+ * action.
*
- * Of the processes that have been marked, we choose which ones to take action
- * against according to how much physical memory they're presently using. We
- * start with the STARTING_THRESHOLD and any processes using more physical memory
- * than the percentage threshold will have action taken against it. If there
- * are no processes over the threshold, then the threshold is cut in half and we
- * look again for processes using more than this threshold. We continue in
- * this fashion until we find at least one process to take action against. This
- * iterative approach is less than ideally efficient, however we only get here
- * when the system is almost in a memory deadlock and is pretty much just
- * thrashing if it's doing anything at all. Therefore, the cpu overhead of
- * potentially multiple passes here probably isn't revelant.
+ * If the biggest non-actionable task is over the "dangerously big" threashold (currently 50% of
+ * the total number of pages held by the compressor, we go ahead and kill it since no other task
+ * can have any real effect on the situation. Otherwise, we go after the actionable process.
*/
+ bzero(&nps, sizeof(nps));
- memory_threshold = (sane_size * STARTING_PERCENTAGE) / 100; /* resident threshold in bytes */
-
- for (num_found = 0; num_found == 0; memory_threshold = memory_threshold / 2) {
- proc_iterate(PROC_ALLPROCLIST, proc_dopcontrol, (void *)&num_found, proc_pcontrol_filter, (void *)&memory_threshold);
+ proc_iterate(PROC_ALLPROCLIST, proc_pcontrol_null, (void *)NULL, proc_pcontrol_filter, (void *)&nps);
+#if NO_PAGING_SPACE_DEBUG
+ printf("low swap: npcs_proc_count = %d, npcs_total_size = %qd, npcs_max_size = %qd\n",
+ nps.npcs_proc_count, nps.npcs_total_size, nps.npcs_max_size);
+ printf("low swap: pcs_proc_count = %d, pcs_total_size = %qd, pcs_max_size = %qd\n",
+ nps.pcs_proc_count, nps.pcs_total_size, nps.pcs_max_size);
+ printf("low swap: apcs_proc_count = %d, apcs_total_size = %qd\n",
+ nps.apcs_proc_count, nps.apcs_total_size);
+#endif
+ if (nps.npcs_max_size > (vm_compressor_pages_compressed() * 50) / 100) {
/*
- * If we just looked with memory_threshold == 0, then there's no need to iterate any further since
- * we won't find any eligible processes at this point.
+ * for now we'll knock out any task that has more then 50% of the pages
+ * held by the compressor
*/
+ if ((p = proc_find(nps.npcs_pid)) != PROC_NULL) {
+
+ if (nps.npcs_uniqueid == p->p_uniqueid) {
+ /*
+ * verify this is still the same process
+ * in case the proc exited and the pid got reused while
+ * we were finishing the proc_iterate and getting to this point
+ */
+ last_no_space_action = now;
- if (memory_threshold == 0) {
- if (num_found == 0) /* log that we couldn't do anything in this case */
- printf("low swap: unable to find any eligible processes to take action on\n");
+ printf("low swap: killing pid %d (%s)\n", p->p_pid, p->p_comm);
+ psignal(p, SIGKILL);
+
+ proc_rele(p);
- break;
+ return (0);
+ }
+
+ proc_rele(p);
}
}
+
+ if (nps.pcs_max_size > 0) {
+ if ((p = proc_find(nps.pcs_pid)) != PROC_NULL) {
+
+ if (nps.pcs_uniqueid == p->p_uniqueid) {
+ /*
+ * verify this is still the same process
+ * in case the proc exited and the pid got reused while
+ * we were finishing the proc_iterate and getting to this point
+ */
+ last_no_space_action = now;
+
+ proc_dopcontrol(p);
+
+ proc_rele(p);
+
+ return (1);
+ }
+
+ proc_rele(p);
+ }
+ }
+ last_no_space_action = now;
+
+ printf("low swap: unable to find any eligible processes to take action on\n");
+
+ return (0);
+}
+
+int
+proc_trace_log(__unused proc_t p, struct proc_trace_log_args *uap, __unused int *retval)
+{
+ int ret = 0;
+ proc_t target_proc = PROC_NULL;
+ pid_t target_pid = uap->pid;
+ uint64_t target_uniqueid = uap->uniqueid;
+ task_t target_task = NULL;
+
+ if (priv_check_cred(kauth_cred_get(), PRIV_PROC_TRACE_INSPECT, 0)) {
+ ret = EPERM;
+ goto out;
+ }
+ target_proc = proc_find(target_pid);
+ if (target_proc != PROC_NULL) {
+ if (target_uniqueid != proc_uniqueid(target_proc)) {
+ ret = ENOENT;
+ goto out;
+ }
+
+ target_task = proc_task(target_proc);
+ if (task_send_trace_memory(target_task, target_pid, target_uniqueid)) {
+ ret = EINVAL;
+ goto out;
+ }
+ } else
+ ret = ENOENT;
+
+out:
+ if (target_proc != PROC_NULL)
+ proc_rele(target_proc);
+ return (ret);
+}
+
+#if VM_SCAN_FOR_SHADOW_CHAIN
+extern int vm_map_shadow_max(vm_map_t map);
+int proc_shadow_max(void);
+int proc_shadow_max(void)
+{
+ int retval, max;
+ proc_t p;
+ task_t task;
+ vm_map_t map;
+
+ max = 0;
+ proc_list_lock();
+ for (p = allproc.lh_first; (p != 0); p = p->p_list.le_next) {
+ if (p->p_stat == SIDL)
+ continue;
+ task = p->task;
+ if (task == NULL) {
+ continue;
+ }
+ map = get_task_map(task);
+ if (map == NULL) {
+ continue;
+ }
+ retval = vm_map_shadow_max(map);
+ if (retval > max) {
+ max = retval;
+ }
+ }
+ proc_list_unlock();
+ return max;
}
+#endif /* VM_SCAN_FOR_SHADOW_CHAIN */
projects / apple / xnu.git / blobdiff