Something went wrong. Try again.
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519// SPDX-License-Identifier: GPL-2.0-only/* * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c. * * Copyright (C) 2000 VA Linux Co * Copyright (C) 2000 Don Dugger <n0ano@valinux.com> * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com> * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) * Copyright (C) 2000 Hewlett-Packard Co. * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com> * Copyright (C) 2000,2001 Andi Kleen, SuSE Labs */
#include <linux/kernel.h>#include <linux/gfp.h>#include <linux/fs.h>#include <linux/types.h>#include <linux/file.h>#include <linux/icmpv6.h>#include <linux/socket.h>#include <linux/syscalls.h>#include <linux/filter.h>#include <linux/compat.h>#include <linux/security.h>#include <linux/audit.h>#include <linux/export.h>
#include <net/scm.h>#include <net/sock.h>#include <net/ip.h>#include <net/ipv6.h>#include <linux/uaccess.h>#include <net/compat.h>
int __get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr *msg, struct sockaddr __user **save_addr){ ssize_t err;
kmsg->msg_flags = msg->msg_flags; kmsg->msg_namelen = msg->msg_namelen;
if (!msg->msg_name) kmsg->msg_namelen = 0;
if (kmsg->msg_namelen < 0) return -EINVAL;
if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) kmsg->msg_namelen = sizeof(struct sockaddr_storage);
kmsg->msg_control_is_user = true; kmsg->msg_get_inq = 0; kmsg->msg_control_user = compat_ptr(msg->msg_control); kmsg->msg_controllen = msg->msg_controllen;
if (save_addr) *save_addr = compat_ptr(msg->msg_name);
if (msg->msg_name && kmsg->msg_namelen) { if (!save_addr) { err = move_addr_to_kernel(compat_ptr(msg->msg_name), kmsg->msg_namelen, kmsg->msg_name); if (err < 0) return err; } } else { kmsg->msg_name = NULL; kmsg->msg_namelen = 0; }
if (msg->msg_iovlen > UIO_MAXIOV) return -EMSGSIZE;
kmsg->msg_ubuf = NULL; return 0;}
int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg, struct sockaddr __user **save_addr, struct iovec **iov){ struct compat_msghdr msg; ssize_t err;
if (copy_from_user(&msg, umsg, sizeof(*umsg))) return -EFAULT;
err = __get_compat_msghdr(kmsg, &msg, save_addr); if (err) return err;
err = import_iovec(save_addr ? ITER_DEST : ITER_SOURCE, compat_ptr(msg.msg_iov), msg.msg_iovlen, UIO_FASTIOV, iov, &kmsg->msg_iter); return err < 0 ? err : 0;}
/* Bleech... */#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
#define CMSG_COMPAT_DATA(cmsg) \ ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr)))#define CMSG_COMPAT_SPACE(len) \ (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len))#define CMSG_COMPAT_LEN(len) \ (sizeof(struct compat_cmsghdr) + (len))
#define CMSG_COMPAT_FIRSTHDR(msg) \ (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ (struct compat_cmsghdr __user *)((msg)->msg_control_user) : \ (struct compat_cmsghdr __user *)NULL)
#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ (ucmlen) <= (unsigned long) \ ((mhdr)->msg_controllen - \ ((char __user *)(ucmsg) - (char __user *)(mhdr)->msg_control_user)))
static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, struct compat_cmsghdr __user *cmsg, int cmsg_len){ char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control_user) > msg->msg_controllen) return NULL; return (struct compat_cmsghdr __user *)ptr;}
/* There is a lot of hair here because the alignment rules (and * thus placement) of cmsg headers and length are different for * 32-bit apps. -DaveM */int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, unsigned char *stackbuf, int stackbuf_size){ struct compat_cmsghdr __user *ucmsg; struct cmsghdr *kcmsg, *kcmsg_base; compat_size_t ucmlen; __kernel_size_t kcmlen, tmp; int err = -EFAULT;
BUILD_BUG_ON(sizeof(struct compat_cmsghdr) != CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)));
kcmlen = 0; kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); while (ucmsg != NULL) { if (get_user(ucmlen, &ucmsg->cmsg_len)) return -EFAULT;
/* Catch bogons. */ if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) return -EINVAL;
tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr)); tmp = CMSG_ALIGN(tmp); kcmlen += tmp; ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); } if (kcmlen == 0) return -EINVAL;
/* The kcmlen holds the 64-bit version of the control length. * It may not be modified as we do not stick it into the kmsg * until we have successfully copied over all of the data * from the user. */ if (kcmlen > stackbuf_size) kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL); if (kcmsg == NULL) return -ENOMEM;
/* Now copy them over neatly. */ memset(kcmsg, 0, kcmlen); ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); while (ucmsg != NULL) { struct compat_cmsghdr cmsg; if (copy_from_user(&cmsg, ucmsg, sizeof(cmsg))) goto Efault; if (!CMSG_COMPAT_OK(cmsg.cmsg_len, ucmsg, kmsg)) goto Einval; tmp = ((cmsg.cmsg_len - sizeof(*ucmsg)) + sizeof(struct cmsghdr)); if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) goto Einval; kcmsg->cmsg_len = tmp; kcmsg->cmsg_level = cmsg.cmsg_level; kcmsg->cmsg_type = cmsg.cmsg_type; tmp = CMSG_ALIGN(tmp); if (copy_from_user(CMSG_DATA(kcmsg), CMSG_COMPAT_DATA(ucmsg), (cmsg.cmsg_len - sizeof(*ucmsg)))) goto Efault;
/* Advance. */ kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, cmsg.cmsg_len); }
/* * check the length of messages copied in is the same as the * what we get from the first loop */ if ((char *)kcmsg - (char *)kcmsg_base != kcmlen) goto Einval;
/* Ok, looks like we made it. Hook it up and return success. */ kmsg->msg_control_is_user = false; kmsg->msg_control = kcmsg_base; kmsg->msg_controllen = kcmlen; return 0;
Einval: err = -EINVAL;Efault: if (kcmsg_base != (struct cmsghdr *)stackbuf) sock_kfree_s(sk, kcmsg_base, kcmlen); return err;}
int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data){ struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control_user; struct compat_cmsghdr cmhdr; struct old_timeval32 ctv; struct old_timespec32 cts[3]; int cmlen;
if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { kmsg->msg_flags |= MSG_CTRUNC; return 0; /* XXX: return error? check spec. */ }
if (!COMPAT_USE_64BIT_TIME) { if (level == SOL_SOCKET && type == SO_TIMESTAMP_OLD) { struct __kernel_old_timeval *tv = (struct __kernel_old_timeval *)data; ctv.tv_sec = tv->tv_sec; ctv.tv_usec = tv->tv_usec; data = &ctv; len = sizeof(ctv); } if (level == SOL_SOCKET && (type == SO_TIMESTAMPNS_OLD || type == SO_TIMESTAMPING_OLD)) { int count = type == SO_TIMESTAMPNS_OLD ? 1 : 3; int i; struct __kernel_old_timespec *ts = data; for (i = 0; i < count; i++) { cts[i].tv_sec = ts[i].tv_sec; cts[i].tv_nsec = ts[i].tv_nsec; } data = &cts; len = sizeof(cts[0]) * count; } }
cmlen = CMSG_COMPAT_LEN(len); if (kmsg->msg_controllen < cmlen) { kmsg->msg_flags |= MSG_CTRUNC; cmlen = kmsg->msg_controllen; } cmhdr.cmsg_level = level; cmhdr.cmsg_type = type; cmhdr.cmsg_len = cmlen;
if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) return -EFAULT; if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) return -EFAULT; cmlen = CMSG_COMPAT_SPACE(len); if (kmsg->msg_controllen < cmlen) cmlen = kmsg->msg_controllen; kmsg->msg_control_user += cmlen; kmsg->msg_controllen -= cmlen; return 0;}
static int scm_max_fds_compat(struct msghdr *msg){ if (msg->msg_controllen <= sizeof(struct compat_cmsghdr)) return 0; return (msg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);}
void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm){ struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *)msg->msg_control_user; unsigned int o_flags = (msg->msg_flags & MSG_CMSG_CLOEXEC) ? O_CLOEXEC : 0; int fdmax = min_t(int, scm_max_fds_compat(msg), scm->fp->count); int __user *cmsg_data = CMSG_COMPAT_DATA(cm); int err = 0, i;
for (i = 0; i < fdmax; i++) { err = scm_recv_one_fd(scm->fp->fp[i], cmsg_data + i, o_flags); if (err < 0) break; }
if (i > 0) { int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
err = put_user(SOL_SOCKET, &cm->cmsg_level); if (!err) err = put_user(SCM_RIGHTS, &cm->cmsg_type); if (!err) err = put_user(cmlen, &cm->cmsg_len); if (!err) { cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); if (msg->msg_controllen < cmlen) cmlen = msg->msg_controllen; msg->msg_control_user += cmlen; msg->msg_controllen -= cmlen; } }
if (i < scm->fp->count || (scm->fp->count && fdmax <= 0)) msg->msg_flags |= MSG_CTRUNC;
/* * All of the files that fit in the message have had their usage counts * incremented, so we just free the list. */ __scm_destroy(scm);}
/* Argument list sizes for compat_sys_socketcall */#define AL(x) ((x) * sizeof(u32))static unsigned char nas[21] = { AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), AL(4), AL(5), AL(4)};#undef AL
static inline long __compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags){ return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT, false);}
COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags){ return __compat_sys_sendmsg(fd, msg, flags);}
static inline long __compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg, unsigned int vlen, unsigned int flags){ return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, flags | MSG_CMSG_COMPAT, false);}
COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, unsigned int, vlen, unsigned int, flags){ return __compat_sys_sendmmsg(fd, mmsg, vlen, flags);}
static inline long __compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags){ return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT, false);}
COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags){ return __compat_sys_recvmsg(fd, msg, flags);}
static inline long __compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len, unsigned int flags, struct sockaddr __user *addr, int __user *addrlen){ return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);}
COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags){ return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL);}
COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags, struct sockaddr __user *, addr, int __user *, addrlen){ return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen);}
COMPAT_SYSCALL_DEFINE5(recvmmsg_time64, int, fd, struct compat_mmsghdr __user *, mmsg, unsigned int, vlen, unsigned int, flags, struct __kernel_timespec __user *, timeout){ return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, flags | MSG_CMSG_COMPAT, timeout, NULL);}
#ifdef CONFIG_COMPAT_32BIT_TIMECOMPAT_SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct compat_mmsghdr __user *, mmsg, unsigned int, vlen, unsigned int, flags, struct old_timespec32 __user *, timeout){ return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, flags | MSG_CMSG_COMPAT, NULL, timeout);}#endif
COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args){ u32 a[AUDITSC_ARGS]; unsigned int len; u32 a0, a1; int ret;
if (call < SYS_SOCKET || call > SYS_SENDMMSG) return -EINVAL; len = nas[call]; if (len > sizeof(a)) return -EINVAL;
if (copy_from_user(a, args, len)) return -EFAULT;
ret = audit_socketcall_compat(len / sizeof(a[0]), a); if (ret) return ret;
a0 = a[0]; a1 = a[1];
switch (call) { case SYS_SOCKET: ret = __sys_socket(a0, a1, a[2]); break; case SYS_BIND: ret = __sys_bind(a0, compat_ptr(a1), a[2]); break; case SYS_CONNECT: ret = __sys_connect(a0, compat_ptr(a1), a[2]); break; case SYS_LISTEN: ret = __sys_listen(a0, a1); break; case SYS_ACCEPT: ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0); break; case SYS_GETSOCKNAME: ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]), 0); break; case SYS_GETPEERNAME: ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]), 1); break; case SYS_SOCKETPAIR: ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); break; case SYS_SEND: ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0); break; case SYS_SENDTO: ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); break; case SYS_RECV: ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], NULL, NULL); break; case SYS_RECVFROM: ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5])); break; case SYS_SHUTDOWN: ret = __sys_shutdown(a0, a1); break; case SYS_SETSOCKOPT: ret = __sys_setsockopt(a0, a1, a[2], compat_ptr(a[3]), a[4]); break; case SYS_GETSOCKOPT: ret = __sys_getsockopt(a0, a1, a[2], compat_ptr(a[3]), compat_ptr(a[4])); break; case SYS_SENDMSG: ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); break; case SYS_SENDMMSG: ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); break; case SYS_RECVMSG: ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); break; case SYS_RECVMMSG: ret = __sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3] | MSG_CMSG_COMPAT, NULL, compat_ptr(a[4])); break; case SYS_ACCEPT4: ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]); break; default: ret = -EINVAL; break; } return ret;}