linux-master/ipc/shm.c

188  * shm_lock_(check_) routines are called in the paths where the rwsem
314 	 * We raced in the idr lookup or with shm_destroy().
379 	 * We raced in the idr lookup or with shm_destroy().
460 		 * in which shp lives.
511 		 * rcu_read_lock was implicitly taken in shm_lock_by_ptr, it's
786 	 * shmid gets reported as "inode#" in /proc/pid/maps.
847 static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_ds *in, int version)
851 		return copy_to_user(buf, in, sizeof(*in));
857 		ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm);
858 		out.shm_segsz	= in->shm_segsz;
859 		out.shm_atime	= in->shm_atime;
860 		out.shm_dtime	= in->shm_dtime;
861 		out.shm_ctime	= in->shm_ctime;
862 		out.shm_cpid	= in->shm_cpid;
863 		out.shm_lpid	= in->shm_lpid;
864 		out.shm_nattch	= in->shm_nattch;
899 static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminfo64 *in, int version)
903 		return copy_to_user(buf, in, sizeof(*in));
908 		if (in->shmmax > INT_MAX)
911 			out.shmmax = (int)in->shmmax;
913 		out.shmmin	= in->shmmin;
914 		out.shmmni	= in->shmmni;
915 		out.shmseg	= in->shmseg;
916 		out.shmall	= in->shmall;
985  * to be held in write mode.
1143 		 * As defined in SUS:
1344 static int copy_compat_shminfo_to_user(void __user *buf, struct shminfo64 *in,
1347 	if (in->shmmax > INT_MAX)
1348 		in->shmmax = INT_MAX;
1352 		info.shmmax = in->shmmax;
1353 		info.shmmin = in->shmmin;
1354 		info.shmmni = in->shmmni;
1355 		info.shmseg = in->shmseg;
1356 		info.shmall = in->shmall;
1361 		info.shmmax = in->shmmax;
1362 		info.shmmin = in->shmmin;
1363 		info.shmmni = in->shmmni;
1364 		info.shmseg = in->shmseg;
1365 		info.shmall = in->shmall;
1385 static int copy_compat_shmid_to_user(void __user *buf, struct shmid64_ds *in,
1391 		to_compat_ipc64_perm(&v.shm_perm, &in->shm_perm);
1392 		v.shm_atime	 = lower_32_bits(in->shm_atime);
1393 		v.shm_atime_high = upper_32_bits(in->shm_atime);
1394 		v.shm_dtime	 = lower_32_bits(in->shm_dtime);
1395 		v.shm_dtime_high = upper_32_bits(in->shm_dtime);
1396 		v.shm_ctime	 = lower_32_bits(in->shm_ctime);
1397 		v.shm_ctime_high = upper_32_bits(in->shm_ctime);
1398 		v.shm_segsz = in->shm_segsz;
1399 		v.shm_nattch = in->shm_nattch;
1400 		v.shm_cpid = in->shm_cpid;
1401 		v.shm_lpid = in->shm_lpid;
1406 		to_compat_ipc_perm(&v.shm_perm, &in->shm_perm);
1407 		v.shm_perm.key = in->shm_perm.key;
1408 		v.shm_atime = in->shm_atime;
1409 		v.shm_dtime = in->shm_dtime;
1410 		v.shm_ctime = in->shm_ctime;
1411 		v.shm_segsz = in->shm_segsz;
1412 		v.shm_nattch = in->shm_nattch;
1413 		v.shm_cpid = in->shm_cpid;
1414 		v.shm_lpid = in->shm_lpid;
1602 	 * pointer from becoming stale in cases where the lifetime of the outer
1721  * The work is done in shm_close.
1753 	 * a part of a vma. Both calls in this function are for full vmas,
1777 			 * in the range we are unmapping.