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authorLinus Torvalds <torvalds@linux-foundation.org>2017-07-15 11:06:17 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-15 11:06:17 -0700
commit2173bd06315109ec73e7a6077c11469bd41d400b (patch)
treee1609ff58b7cc56fd034210b24409fbe69658d04
parent568d135d337d3114688fef9fdbce7fb6dbbd04c7 (diff)
parentf8f8a727eab1c5b78c3703a461565b042979cc79 (diff)
Merge branch 'misc.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull network field-by-field copy-in updates from Al Viro: "This part of the misc compat queue was held back for review from networking folks and since davem has jus ACKed those..." * 'misc.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: get_compat_bpf_fprog(): don't copyin field-by-field get_compat_msghdr(): get rid of field-by-field copyin copy_msghdr_from_user(): get rid of field-by-field copyin
-rw-r--r--net/compat.c49
-rw-r--r--net/socket.c31
2 files changed, 37 insertions, 43 deletions
diff --git a/net/compat.c b/net/compat.c
index aba929e5250f..6ded6c821d7a 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -37,21 +37,16 @@ int get_compat_msghdr(struct msghdr *kmsg,
struct sockaddr __user **save_addr,
struct iovec **iov)
{
- compat_uptr_t uaddr, uiov, tmp3;
- compat_size_t nr_segs;
+ struct compat_msghdr msg;
ssize_t err;
- if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
- __get_user(uaddr, &umsg->msg_name) ||
- __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
- __get_user(uiov, &umsg->msg_iov) ||
- __get_user(nr_segs, &umsg->msg_iovlen) ||
- __get_user(tmp3, &umsg->msg_control) ||
- __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
- __get_user(kmsg->msg_flags, &umsg->msg_flags))
+ if (copy_from_user(&msg, umsg, sizeof(*umsg)))
return -EFAULT;
- if (!uaddr)
+ 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)
@@ -59,14 +54,16 @@ int get_compat_msghdr(struct msghdr *kmsg,
if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
kmsg->msg_namelen = sizeof(struct sockaddr_storage);
- kmsg->msg_control = compat_ptr(tmp3);
+
+ kmsg->msg_control = compat_ptr(msg.msg_control);
+ kmsg->msg_controllen = msg.msg_controllen;
if (save_addr)
- *save_addr = compat_ptr(uaddr);
+ *save_addr = compat_ptr(msg.msg_name);
- if (uaddr && kmsg->msg_namelen) {
+ if (msg.msg_name && kmsg->msg_namelen) {
if (!save_addr) {
- err = move_addr_to_kernel(compat_ptr(uaddr),
+ err = move_addr_to_kernel(compat_ptr(msg.msg_name),
kmsg->msg_namelen,
kmsg->msg_name);
if (err < 0)
@@ -77,13 +74,13 @@ int get_compat_msghdr(struct msghdr *kmsg,
kmsg->msg_namelen = 0;
}
- if (nr_segs > UIO_MAXIOV)
+ if (msg.msg_iovlen > UIO_MAXIOV)
return -EMSGSIZE;
kmsg->msg_iocb = NULL;
return compat_import_iovec(save_addr ? READ : WRITE,
- compat_ptr(uiov), nr_segs,
+ compat_ptr(msg.msg_iov), msg.msg_iovlen,
UIO_FASTIOV, iov, &kmsg->msg_iter);
}
@@ -316,15 +313,15 @@ struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval)
{
struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
- compat_uptr_t ptr;
- u16 len;
-
- if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
- !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
- __get_user(len, &fprog32->len) ||
- __get_user(ptr, &fprog32->filter) ||
- __put_user(len, &kfprog->len) ||
- __put_user(compat_ptr(ptr), &kfprog->filter))
+ struct compat_sock_fprog f32;
+ struct sock_fprog f;
+
+ if (copy_from_user(&f32, fprog32, sizeof(*fprog32)))
+ return NULL;
+ memset(&f, 0, sizeof(f));
+ f.len = f32.len;
+ f.filter = compat_ptr(f32.filter);
+ if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog)))
return NULL;
return kfprog;
diff --git a/net/socket.c b/net/socket.c
index 59e902b9df09..bf2122691fba 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1910,22 +1910,18 @@ static int copy_msghdr_from_user(struct msghdr *kmsg,
struct sockaddr __user **save_addr,
struct iovec **iov)
{
- struct sockaddr __user *uaddr;
- struct iovec __user *uiov;
- size_t nr_segs;
+ struct user_msghdr msg;
ssize_t err;
- if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
- __get_user(uaddr, &umsg->msg_name) ||
- __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
- __get_user(uiov, &umsg->msg_iov) ||
- __get_user(nr_segs, &umsg->msg_iovlen) ||
- __get_user(kmsg->msg_control, &umsg->msg_control) ||
- __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
- __get_user(kmsg->msg_flags, &umsg->msg_flags))
+ if (copy_from_user(&msg, umsg, sizeof(*umsg)))
return -EFAULT;
- if (!uaddr)
+ kmsg->msg_control = msg.msg_control;
+ kmsg->msg_controllen = msg.msg_controllen;
+ 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)
@@ -1935,11 +1931,11 @@ static int copy_msghdr_from_user(struct msghdr *kmsg,
kmsg->msg_namelen = sizeof(struct sockaddr_storage);
if (save_addr)
- *save_addr = uaddr;
+ *save_addr = msg.msg_name;
- if (uaddr && kmsg->msg_namelen) {
+ if (msg.msg_name && kmsg->msg_namelen) {
if (!save_addr) {
- err = move_addr_to_kernel(uaddr, kmsg->msg_namelen,
+ err = move_addr_to_kernel(msg.msg_name, kmsg->msg_namelen,
kmsg->msg_name);
if (err < 0)
return err;
@@ -1949,12 +1945,13 @@ static int copy_msghdr_from_user(struct msghdr *kmsg,
kmsg->msg_namelen = 0;
}
- if (nr_segs > UIO_MAXIOV)
+ if (msg.msg_iovlen > UIO_MAXIOV)
return -EMSGSIZE;
kmsg->msg_iocb = NULL;
- return import_iovec(save_addr ? READ : WRITE, uiov, nr_segs,
+ return import_iovec(save_addr ? READ : WRITE,
+ msg.msg_iov, msg.msg_iovlen,
UIO_FASTIOV, iov, &kmsg->msg_iter);
}

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