Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 513 insertions, 0 deletions

diff --git a/arch/arm/kernel/sys_oabi-compat.c b/arch/arm/kernel/sys_oabi-compat.c
new file mode 100644
index 000000000..68112c172
--- /dev/null
+++ b/arch/arm/kernel/sys_oabi-compat.c
@@ -0,0 +1,513 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  arch/arm/kernel/sys_oabi-compat.c
+ *
+ *  Compatibility wrappers for syscalls that are used from
+ *  old ABI user space binaries with an EABI kernel.
+ *
+ *  Author:	Nicolas Pitre
+ *  Created:	Oct 7, 2005
+ *  Copyright:	MontaVista Software, Inc.
+ */
+
+/*
+ * The legacy ABI and the new ARM EABI have different rules making some
+ * syscalls incompatible especially with structure arguments.
+ * Most notably, Eabi says 64-bit members should be 64-bit aligned instead of
+ * simply word aligned.  EABI also pads structures to the size of the largest
+ * member it contains instead of the invariant 32-bit.
+ *
+ * The following syscalls are affected:
+ *
+ * sys_stat64:
+ * sys_lstat64:
+ * sys_fstat64:
+ * sys_fstatat64:
+ *
+ *   struct stat64 has different sizes and some members are shifted
+ *   Compatibility wrappers are needed for them and provided below.
+ *
+ * sys_fcntl64:
+ *
+ *   struct flock64 has different sizes and some members are shifted
+ *   A compatibility wrapper is needed and provided below.
+ *
+ * sys_statfs64:
+ * sys_fstatfs64:
+ *
+ *   struct statfs64 has extra padding with EABI growing its size from
+ *   84 to 88.  This struct is now __attribute__((packed,aligned(4)))
+ *   with a small assembly wrapper to force the sz argument to 84 if it is 88
+ *   to avoid copying the extra padding over user space unexpecting it.
+ *
+ * sys_newuname:
+ *
+ *   struct new_utsname has no padding with EABI.  No problem there.
+ *
+ * sys_epoll_ctl:
+ * sys_epoll_wait:
+ *
+ *   struct epoll_event has its second member shifted also affecting the
+ *   structure size. Compatibility wrappers are needed and provided below.
+ *
+ * sys_ipc:
+ * sys_semop:
+ * sys_semtimedop:
+ *
+ *   struct sembuf loses its padding with EABI.  Since arrays of them are
+ *   used they have to be copyed to remove the padding. Compatibility wrappers
+ *   provided below.
+ *
+ * sys_bind:
+ * sys_connect:
+ * sys_sendmsg:
+ * sys_sendto:
+ * sys_socketcall:
+ *
+ *   struct sockaddr_un loses its padding with EABI.  Since the size of the
+ *   structure is used as a validation test in unix_mkname(), we need to
+ *   change the length argument to 110 whenever it is 112.  Compatibility
+ *   wrappers provided below.
+ */
+
+#include <linux/syscalls.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/cred.h>
+#include <linux/fcntl.h>
+#include <linux/eventpoll.h>
+#include <linux/sem.h>
+#include <linux/socket.h>
+#include <linux/net.h>
+#include <linux/ipc.h>
+#include <linux/ipc_namespace.h>
+#include <linux/uaccess.h>
+#include <linux/slab.h>
+
+#include <asm/syscall.h>
+
+struct oldabi_stat64 {
+	unsigned long long st_dev;
+	unsigned int	__pad1;
+	unsigned long	__st_ino;
+	unsigned int	st_mode;
+	unsigned int	st_nlink;
+
+	unsigned long	st_uid;
+	unsigned long	st_gid;
+
+	unsigned long long st_rdev;
+	unsigned int	__pad2;
+
+	long long	st_size;
+	unsigned long	st_blksize;
+	unsigned long long st_blocks;
+
+	unsigned long	st_atime;
+	unsigned long	st_atime_nsec;
+
+	unsigned long	st_mtime;
+	unsigned long	st_mtime_nsec;
+
+	unsigned long	st_ctime;
+	unsigned long	st_ctime_nsec;
+
+	unsigned long long st_ino;
+} __attribute__ ((packed,aligned(4)));
+
+static long cp_oldabi_stat64(struct kstat *stat,
+			     struct oldabi_stat64 __user *statbuf)
+{
+	struct oldabi_stat64 tmp;
+
+	tmp.st_dev = huge_encode_dev(stat->dev);
+	tmp.__pad1 = 0;
+	tmp.__st_ino = stat->ino;
+	tmp.st_mode = stat->mode;
+	tmp.st_nlink = stat->nlink;
+	tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
+	tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
+	tmp.st_rdev = huge_encode_dev(stat->rdev);
+	tmp.st_size = stat->size;
+	tmp.st_blocks = stat->blocks;
+	tmp.__pad2 = 0;
+	tmp.st_blksize = stat->blksize;
+	tmp.st_atime = stat->atime.tv_sec;
+	tmp.st_atime_nsec = stat->atime.tv_nsec;
+	tmp.st_mtime = stat->mtime.tv_sec;
+	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
+	tmp.st_ctime = stat->ctime.tv_sec;
+	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
+	tmp.st_ino = stat->ino;
+	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
+}
+
+asmlinkage long sys_oabi_stat64(const char __user * filename,
+				struct oldabi_stat64 __user * statbuf)
+{
+	struct kstat stat;
+	int error = vfs_stat(filename, &stat);
+	if (!error)
+		error = cp_oldabi_stat64(&stat, statbuf);
+	return error;
+}
+
+asmlinkage long sys_oabi_lstat64(const char __user * filename,
+				 struct oldabi_stat64 __user * statbuf)
+{
+	struct kstat stat;
+	int error = vfs_lstat(filename, &stat);
+	if (!error)
+		error = cp_oldabi_stat64(&stat, statbuf);
+	return error;
+}
+
+asmlinkage long sys_oabi_fstat64(unsigned long fd,
+				 struct oldabi_stat64 __user * statbuf)
+{
+	struct kstat stat;
+	int error = vfs_fstat(fd, &stat);
+	if (!error)
+		error = cp_oldabi_stat64(&stat, statbuf);
+	return error;
+}
+
+asmlinkage long sys_oabi_fstatat64(int dfd,
+				   const char __user *filename,
+				   struct oldabi_stat64  __user *statbuf,
+				   int flag)
+{
+	struct kstat stat;
+	int error;
+
+	error = vfs_fstatat(dfd, filename, &stat, flag);
+	if (error)
+		return error;
+	return cp_oldabi_stat64(&stat, statbuf);
+}
+
+struct oabi_flock64 {
+	short	l_type;
+	short	l_whence;
+	loff_t	l_start;
+	loff_t	l_len;
+	pid_t	l_pid;
+} __attribute__ ((packed,aligned(4)));
+
+static int get_oabi_flock(struct flock64 *kernel, struct oabi_flock64 __user *arg)
+{
+	struct oabi_flock64 user;
+
+	if (copy_from_user(&user, (struct oabi_flock64 __user *)arg,
+			   sizeof(user)))
+		return -EFAULT;
+
+	kernel->l_type	 = user.l_type;
+	kernel->l_whence = user.l_whence;
+	kernel->l_start	 = user.l_start;
+	kernel->l_len	 = user.l_len;
+	kernel->l_pid	 = user.l_pid;
+
+	return 0;
+}
+
+static int put_oabi_flock(struct flock64 *kernel, struct oabi_flock64 __user *arg)
+{
+	struct oabi_flock64 user;
+
+	user.l_type	= kernel->l_type;
+	user.l_whence	= kernel->l_whence;
+	user.l_start	= kernel->l_start;
+	user.l_len	= kernel->l_len;
+	user.l_pid	= kernel->l_pid;
+
+	if (copy_to_user((struct oabi_flock64 __user *)arg,
+			 &user, sizeof(user)))
+		return -EFAULT;
+
+	return 0;
+}
+
+asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd,
+				 unsigned long arg)
+{
+	void __user *argp = (void __user *)arg;
+	struct fd f = fdget_raw(fd);
+	struct flock64 flock;
+	long err = -EBADF;
+
+	if (!f.file)
+		goto out;
+
+	switch (cmd) {
+	case F_GETLK64:
+	case F_OFD_GETLK:
+		err = security_file_fcntl(f.file, cmd, arg);
+		if (err)
+			break;
+		err = get_oabi_flock(&flock, argp);
+		if (err)
+			break;
+		err = fcntl_getlk64(f.file, cmd, &flock);
+		if (!err)
+		       err = put_oabi_flock(&flock, argp);
+		break;
+	case F_SETLK64:
+	case F_SETLKW64:
+	case F_OFD_SETLK:
+	case F_OFD_SETLKW:
+		err = security_file_fcntl(f.file, cmd, arg);
+		if (err)
+			break;
+		err = get_oabi_flock(&flock, argp);
+		if (err)
+			break;
+		err = fcntl_setlk64(fd, f.file, cmd, &flock);
+		break;
+	default:
+		err = sys_fcntl64(fd, cmd, arg);
+		break;
+	}
+	fdput(f);
+out:
+	return err;
+}
+
+struct oabi_epoll_event {
+	__poll_t events;
+	__u64 data;
+} __attribute__ ((packed,aligned(4)));
+
+#ifdef CONFIG_EPOLL
+asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
+				   struct oabi_epoll_event __user *event)
+{
+	struct oabi_epoll_event user;
+	struct epoll_event kernel;
+
+	if (ep_op_has_event(op) &&
+	    copy_from_user(&user, event, sizeof(user)))
+		return -EFAULT;
+
+	kernel.events = user.events;
+	kernel.data   = user.data;
+
+	return do_epoll_ctl(epfd, op, fd, &kernel, false);
+}
+#else
+asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
+				   struct oabi_epoll_event __user *event)
+{
+	return -EINVAL;
+}
+#endif
+
+struct epoll_event __user *
+epoll_put_uevent(__poll_t revents, __u64 data,
+		 struct epoll_event __user *uevent)
+{
+	if (in_oabi_syscall()) {
+		struct oabi_epoll_event __user *oevent = (void __user *)uevent;
+
+		if (__put_user(revents, &oevent->events) ||
+		    __put_user(data, &oevent->data))
+			return NULL;
+
+		return (void __user *)(oevent+1);
+	}
+
+	if (__put_user(revents, &uevent->events) ||
+	    __put_user(data, &uevent->data))
+		return NULL;
+
+	return uevent+1;
+}
+
+struct oabi_sembuf {
+	unsigned short	sem_num;
+	short		sem_op;
+	short		sem_flg;
+	unsigned short	__pad;
+};
+
+#define sc_semopm     sem_ctls[2]
+
+#ifdef CONFIG_SYSVIPC
+asmlinkage long sys_oabi_semtimedop(int semid,
+				    struct oabi_sembuf __user *tsops,
+				    unsigned nsops,
+				    const struct old_timespec32 __user *timeout)
+{
+	struct ipc_namespace *ns;
+	struct sembuf *sops;
+	long err;
+	int i;
+
+	ns = current->nsproxy->ipc_ns;
+	if (nsops > ns->sc_semopm)
+		return -E2BIG;
+	if (nsops < 1 || nsops > SEMOPM)
+		return -EINVAL;
+	sops = kvmalloc_array(nsops, sizeof(*sops), GFP_KERNEL);
+	if (!sops)
+		return -ENOMEM;
+	err = 0;
+	for (i = 0; i < nsops; i++) {
+		struct oabi_sembuf osb;
+		err |= copy_from_user(&osb, tsops, sizeof(osb));
+		sops[i].sem_num = osb.sem_num;
+		sops[i].sem_op = osb.sem_op;
+		sops[i].sem_flg = osb.sem_flg;
+		tsops++;
+	}
+	if (err) {
+		err = -EFAULT;
+		goto out;
+	}
+
+	if (timeout) {
+		struct timespec64 ts;
+		err = get_old_timespec32(&ts, timeout);
+		if (err)
+			goto out;
+		err = __do_semtimedop(semid, sops, nsops, &ts, ns);
+		goto out;
+	}
+	err = __do_semtimedop(semid, sops, nsops, NULL, ns);
+out:
+	kvfree(sops);
+	return err;
+}
+
+asmlinkage long sys_oabi_semop(int semid, struct oabi_sembuf __user *tsops,
+			       unsigned nsops)
+{
+	return sys_oabi_semtimedop(semid, tsops, nsops, NULL);
+}
+
+asmlinkage int sys_oabi_ipc(uint call, int first, int second, int third,
+			    void __user *ptr, long fifth)
+{
+	switch (call & 0xffff) {
+	case SEMOP:
+		return  sys_oabi_semtimedop(first,
+					    (struct oabi_sembuf __user *)ptr,
+					    second, NULL);
+	case SEMTIMEDOP:
+		return  sys_oabi_semtimedop(first,
+					    (struct oabi_sembuf __user *)ptr,
+					    second,
+					    (const struct old_timespec32 __user *)fifth);
+	default:
+		return sys_ipc(call, first, second, third, ptr, fifth);
+	}
+}
+#else
+asmlinkage long sys_oabi_semtimedop(int semid,
+				    struct oabi_sembuf __user *tsops,
+				    unsigned nsops,
+				    const struct old_timespec32 __user *timeout)
+{
+	return -ENOSYS;
+}
+
+asmlinkage long sys_oabi_semop(int semid, struct oabi_sembuf __user *tsops,
+			       unsigned nsops)
+{
+	return -ENOSYS;
+}
+
+asmlinkage int sys_oabi_ipc(uint call, int first, int second, int third,
+			    void __user *ptr, long fifth)
+{
+	return -ENOSYS;
+}
+#endif
+
+asmlinkage long sys_oabi_bind(int fd, struct sockaddr __user *addr, int addrlen)
+{
+	sa_family_t sa_family;
+	if (addrlen == 112 &&
+	    get_user(sa_family, &addr->sa_family) == 0 &&
+	    sa_family == AF_UNIX)
+			addrlen = 110;
+	return sys_bind(fd, addr, addrlen);
+}
+
+asmlinkage long sys_oabi_connect(int fd, struct sockaddr __user *addr, int addrlen)
+{
+	sa_family_t sa_family;
+	if (addrlen == 112 &&
+	    get_user(sa_family, &addr->sa_family) == 0 &&
+	    sa_family == AF_UNIX)
+			addrlen = 110;
+	return sys_connect(fd, addr, addrlen);
+}
+
+asmlinkage long sys_oabi_sendto(int fd, void __user *buff,
+				size_t len, unsigned flags,
+				struct sockaddr __user *addr,
+				int addrlen)
+{
+	sa_family_t sa_family;
+	if (addrlen == 112 &&
+	    get_user(sa_family, &addr->sa_family) == 0 &&
+	    sa_family == AF_UNIX)
+			addrlen = 110;
+	return sys_sendto(fd, buff, len, flags, addr, addrlen);
+}
+
+asmlinkage long sys_oabi_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
+{
+	struct sockaddr __user *addr;
+	int msg_namelen;
+	sa_family_t sa_family;
+	if (msg &&
+	    get_user(msg_namelen, &msg->msg_namelen) == 0 &&
+	    msg_namelen == 112 &&
+	    get_user(addr, &msg->msg_name) == 0 &&
+	    get_user(sa_family, &addr->sa_family) == 0 &&
+	    sa_family == AF_UNIX)
+	{
+		/*
+		 * HACK ALERT: there is a limit to how much backward bending
+		 * we should do for what is actually a transitional
+		 * compatibility layer.  This already has known flaws with
+		 * a few ioctls that we don't intend to fix.  Therefore
+		 * consider this blatent hack as another one... and take care
+		 * to run for cover.  In most cases it will "just work fine".
+		 * If it doesn't, well, tough.
+		 */
+		put_user(110, &msg->msg_namelen);
+	}
+	return sys_sendmsg(fd, msg, flags);
+}
+
+asmlinkage long sys_oabi_socketcall(int call, unsigned long __user *args)
+{
+	unsigned long r = -EFAULT, a[6];
+
+	switch (call) {
+	case SYS_BIND:
+		if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
+			r = sys_oabi_bind(a[0], (struct sockaddr __user *)a[1], a[2]);
+		break;
+	case SYS_CONNECT:
+		if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
+			r = sys_oabi_connect(a[0], (struct sockaddr __user *)a[1], a[2]);
+		break;
+	case SYS_SENDTO:
+		if (copy_from_user(a, args, 6 * sizeof(long)) == 0)
+			r = sys_oabi_sendto(a[0], (void __user *)a[1], a[2], a[3],
+					    (struct sockaddr __user *)a[4], a[5]);
+		break;
+	case SYS_SENDMSG:
+		if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
+			r = sys_oabi_sendmsg(a[0], (struct user_msghdr __user *)a[1], a[2]);
+		break;
+	default:
+		r = sys_socketcall(call, args);
+	}
+
+	return r;
+}