Differential D13459 Diff 38780 head/sys/kern/sysv_shm.c

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head/sys/kern/sysv_shm.c

Show First 20 Lines • Show All 860 Lines • ▼ Show 20 Lines	shmrealloc(void)
struct shmid_kernel *newsegs;		struct shmid_kernel *newsegs;
int i;		int i;

SYSVSHM_ASSERT_LOCKED();		SYSVSHM_ASSERT_LOCKED();

if (shmalloced >= shminfo.shmmni)		if (shmalloced >= shminfo.shmmni)
return;		return;

newsegs = malloc(shminfo.shmmni * sizeof(*newsegs), M_SHM, M_WAITOK);		newsegs = malloc(shminfo.shmmni * sizeof(*newsegs), M_SHM,
		M_WAITOK \| M_ZERO);
for (i = 0; i < shmalloced; i++)		for (i = 0; i < shmalloced; i++)
bcopy(&shmsegs[i], &newsegs[i], sizeof(newsegs[0]));		bcopy(&shmsegs[i], &newsegs[i], sizeof(newsegs[0]));
for (; i < shminfo.shmmni; i++) {		for (; i < shminfo.shmmni; i++) {
newsegs[i].u.shm_perm.mode = SHMSEG_FREE;		newsegs[i].u.shm_perm.mode = SHMSEG_FREE;
newsegs[i].u.shm_perm.seq = 0;		newsegs[i].u.shm_perm.seq = 0;
#ifdef MAC		#ifdef MAC
mac_sysvshm_init(&newsegs[i]);		mac_sysvshm_init(&newsegs[i]);
#endif		#endif
▲ Show 20 Lines • Show All 61 Lines • ▼ Show 20 Lines	if (shminfo.shmmax == SHMMAX) {
/* Initialize shmmax dealing with possible overflow. */		/* Initialize shmmax dealing with possible overflow. */
for (i = PAGE_SIZE; i != 0; i--) {		for (i = PAGE_SIZE; i != 0; i--) {
shminfo.shmmax = shminfo.shmall * i;		shminfo.shmmax = shminfo.shmall * i;
if ((shminfo.shmmax / shminfo.shmall) == (u_long)i)		if ((shminfo.shmmax / shminfo.shmall) == (u_long)i)
break;		break;
}		}
}		}
shmalloced = shminfo.shmmni;		shmalloced = shminfo.shmmni;
shmsegs = malloc(shmalloced * sizeof(shmsegs[0]), M_SHM, M_WAITOK);		shmsegs = malloc(shmalloced * sizeof(shmsegs[0]), M_SHM,
		M_WAITOK\|M_ZERO);
for (i = 0; i < shmalloced; i++) {		for (i = 0; i < shmalloced; i++) {
shmsegs[i].u.shm_perm.mode = SHMSEG_FREE;		shmsegs[i].u.shm_perm.mode = SHMSEG_FREE;
shmsegs[i].u.shm_perm.seq = 0;		shmsegs[i].u.shm_perm.seq = 0;
#ifdef MAC		#ifdef MAC
mac_sysvshm_init(&shmsegs[i]);		mac_sysvshm_init(&shmsegs[i]);
#endif		#endif
}		}
shm_last_free = 0;		shm_last_free = 0;
▲ Show 20 Lines • Show All 70 Lines • ▼ Show 20 Lines	#endif
sx_destroy(&sysvshmsx);		sx_destroy(&sysvshmsx);
return (0);		return (0);
}		}

static int		static int
sysctl_shmsegs(SYSCTL_HANDLER_ARGS)		sysctl_shmsegs(SYSCTL_HANDLER_ARGS)
{		{
struct shmid_kernel tshmseg;		struct shmid_kernel tshmseg;
		#ifdef COMPAT_FREEBSD32
		struct shmid_kernel32 tshmseg32;
		#endif
struct prison pr, rpr;		struct prison pr, rpr;
		void *outaddr;
		size_t outsize;
int error, i;		int error, i;

SYSVSHM_LOCK();		SYSVSHM_LOCK();
pr = req->td->td_ucred->cr_prison;		pr = req->td->td_ucred->cr_prison;
rpr = shm_find_prison(req->td->td_ucred);		rpr = shm_find_prison(req->td->td_ucred);
error = 0;		error = 0;
for (i = 0; i < shmalloced; i++) {		for (i = 0; i < shmalloced; i++) {
if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 \|\|		if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 \|\|
rpr == NULL \|\| shm_prison_cansee(rpr, &shmsegs[i]) != 0) {		rpr == NULL \|\| shm_prison_cansee(rpr, &shmsegs[i]) != 0) {
bzero(&tshmseg, sizeof(tshmseg));		bzero(&tshmseg, sizeof(tshmseg));
tshmseg.u.shm_perm.mode = SHMSEG_FREE;		tshmseg.u.shm_perm.mode = SHMSEG_FREE;
} else {		} else {
tshmseg = shmsegs[i];		tshmseg = shmsegs[i];
if (tshmseg.cred->cr_prison != pr)		if (tshmseg.cred->cr_prison != pr)
tshmseg.u.shm_perm.key = IPC_PRIVATE;		tshmseg.u.shm_perm.key = IPC_PRIVATE;
}		}
error = SYSCTL_OUT(req, &tshmseg, sizeof(tshmseg));		#ifdef COMPAT_FREEBSD32
		if (SV_CURPROC_FLAG(SV_ILP32)) {
		bzero(&tshmseg32, sizeof(tshmseg32));
		freebsd32_ipcperm_out(&tshmseg.u.shm_perm,
		&tshmseg32.u.shm_perm);
		CP(tshmseg, tshmseg32, u.shm_segsz);
		CP(tshmseg, tshmseg32, u.shm_lpid);
		CP(tshmseg, tshmseg32, u.shm_cpid);
		CP(tshmseg, tshmseg32, u.shm_nattch);
		CP(tshmseg, tshmseg32, u.shm_atime);
		CP(tshmseg, tshmseg32, u.shm_dtime);
		CP(tshmseg, tshmseg32, u.shm_ctime);
		/* Don't copy object, label, or cred */
		outaddr = &tshmseg32;
		outsize = sizeof(tshmseg32);
		} else
		#endif
		{
		tshmseg.object = NULL;
		tshmseg.label = NULL;
		tshmseg.cred = NULL;
		outaddr = &tshmseg;
		outsize = sizeof(tshmseg);
		}
		error = SYSCTL_OUT(req, outaddr, outsize);
if (error != 0)		if (error != 0)
break;		break;
}		}
SYSVSHM_UNLOCK();		SYSVSHM_UNLOCK();
return (error);		return (error);
}		}

static int		static int
▲ Show 20 Lines • Show All 607 Lines • Show Last 20 Lines