From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/arm/kernel/sys_oabi-compat.c | 513 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 513 insertions(+) create mode 100644 arch/arm/kernel/sys_oabi-compat.c (limited to 'arch/arm/kernel/sys_oabi-compat.c') 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +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; +} -- cgit v1.2.3