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aio/vfs: cleanup of rw_copy_check_uvector() and compat_rw_copy_check_uvector()

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A cleanup of rw_copy_check_uvector and compat_rw_copy_check_uvector after
changes made to support CMA in an earlier patch.

Rather than having an additional check_access parameter to these
functions, the first paramater type is overloaded to allow the caller to
specify CHECK_IOVEC_ONLY which means check that the contents of the iovec
are valid, but do not check the memory that they point to.  This is used
by process_vm_readv/writev where we need to validate that a iovec passed
to the syscall is valid but do not want to check the memory that it points
to at this point because it refers to an address space in another process.

Signed-off-by: Chris Yeoh <yeohc@au1.ibm.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christopher Yeoh 2012-05-31 16:26:42 -07:00 committed by Linus Torvalds
parent ee62c6b2dc
commit ac34ebb3a6
8 changed files with 29 additions and 23 deletions
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4
fs/aio.c
View file

@ -1446,13 +1446,13 @@ static ssize_t aio_setup_vectored_rw(int type, struct kiocb *kiocb, bool compat)
ret = compat_rw_copy_check_uvector(type,
(struct compat_iovec __user *)kiocb->ki_buf,
kiocb->ki_nbytes, 1, &kiocb->ki_inline_vec,
&kiocb->ki_iovec, 1);
&kiocb->ki_iovec);
else
#endif
ret = rw_copy_check_uvector(type,
(struct iovec __user *)kiocb->ki_buf,
kiocb->ki_nbytes, 1, &kiocb->ki_inline_vec,
&kiocb->ki_iovec, 1);
&kiocb->ki_iovec);
if (ret < 0)
goto out;

6
fs/compat.c
View file

@ -532,7 +532,7 @@ out:
ssize_t compat_rw_copy_check_uvector(int type,
const struct compat_iovec __user *uvector, unsigned long nr_segs,
unsigned long fast_segs, struct iovec *fast_pointer,
struct iovec **ret_pointer, int check_access)
struct iovec **ret_pointer)
{
compat_ssize_t tot_len;
struct iovec *iov = *ret_pointer = fast_pointer;
@ -579,7 +579,7 @@ ssize_t compat_rw_copy_check_uvector(int type,
}
if (len < 0) /* size_t not fitting in compat_ssize_t .. */
goto out;
if (check_access &&
if (type >= 0 &&
!access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
ret = -EFAULT;
goto out;
@ -1094,7 +1094,7 @@ static ssize_t compat_do_readv_writev(int type, struct file *file,
goto out;
tot_len = compat_rw_copy_check_uvector(type, uvector, nr_segs,
UIO_FASTIOV, iovstack, &iov, 1);
UIO_FASTIOV, iovstack, &iov);
if (tot_len == 0) {
ret = 0;
goto out;

7
fs/read_write.c
View file

@ -633,8 +633,7 @@ ssize_t do_loop_readv_writev(struct file *filp, struct iovec *iov,
ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
unsigned long nr_segs, unsigned long fast_segs,
struct iovec *fast_pointer,
struct iovec **ret_pointer,
int check_access)
struct iovec **ret_pointer)
{
unsigned long seg;
ssize_t ret;
@ -690,7 +689,7 @@ ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
ret = -EINVAL;
goto out;
}
if (check_access
if (type >= 0
&& unlikely(!access_ok(vrfy_dir(type), buf, len))) {
ret = -EFAULT;
goto out;
@ -723,7 +722,7 @@ static ssize_t do_readv_writev(int type, struct file *file,
}
ret = rw_copy_check_uvector(type, uvector, nr_segs,
ARRAY_SIZE(iovstack), iovstack, &iov, 1);
ARRAY_SIZE(iovstack), iovstack, &iov);
if (ret <= 0)
goto out;

3
include/linux/compat.h
View file

@ -577,8 +577,7 @@ extern ssize_t compat_rw_copy_check_uvector(int type,
const struct compat_iovec __user *uvector,
unsigned long nr_segs,
unsigned long fast_segs, struct iovec *fast_pointer,
struct iovec **ret_pointer,
int check_access);
struct iovec **ret_pointer);
extern void __user *compat_alloc_user_space(unsigned long len);

12
include/linux/fs.h
View file

@ -173,6 +173,15 @@ struct inodes_stat_t {
#define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA)
#define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA)
/*
* Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector
* that indicates that they should check the contents of the iovec are
* valid, but not check the memory that the iovec elements
* points too.
*/
#define CHECK_IOVEC_ONLY -1
#define SEL_IN 1
#define SEL_OUT 2
#define SEL_EX 4
@ -1690,8 +1699,7 @@ struct seq_file;
ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
unsigned long nr_segs, unsigned long fast_segs,
struct iovec *fast_pointer,
struct iovec **ret_pointer,
int check_access);
struct iovec **ret_pointer);
extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);

16
mm/process_vm_access.c
View file

@ -371,15 +371,15 @@ static ssize_t process_vm_rw(pid_t pid,
/* Check iovecs */
if (vm_write)
rc = rw_copy_check_uvector(WRITE, lvec, liovcnt, UIO_FASTIOV,
iovstack_l, &iov_l, 1);
iovstack_l, &iov_l);
else
rc = rw_copy_check_uvector(READ, lvec, liovcnt, UIO_FASTIOV,
iovstack_l, &iov_l, 1);
iovstack_l, &iov_l);
if (rc <= 0)
goto free_iovecs;
rc = rw_copy_check_uvector(READ, rvec, riovcnt, UIO_FASTIOV,
iovstack_r, &iov_r, 0);
rc = rw_copy_check_uvector(CHECK_IOVEC_ONLY, rvec, riovcnt, UIO_FASTIOV,
iovstack_r, &iov_r);
if (rc <= 0)
goto free_iovecs;
@ -438,16 +438,16 @@ compat_process_vm_rw(compat_pid_t pid,
if (vm_write)
rc = compat_rw_copy_check_uvector(WRITE, lvec, liovcnt,
UIO_FASTIOV, iovstack_l,
&iov_l, 1);
&iov_l);
else
rc = compat_rw_copy_check_uvector(READ, lvec, liovcnt,
UIO_FASTIOV, iovstack_l,
&iov_l, 1);
&iov_l);
if (rc <= 0)
goto free_iovecs;
rc = compat_rw_copy_check_uvector(READ, rvec, riovcnt,
rc = compat_rw_copy_check_uvector(CHECK_IOVEC_ONLY, rvec, riovcnt,
UIO_FASTIOV, iovstack_r,
&iov_r, 0);
&iov_r);
if (rc <= 0)
goto free_iovecs;

2
security/keys/compat.c
View file

@ -38,7 +38,7 @@ long compat_keyctl_instantiate_key_iov(
ret = compat_rw_copy_check_uvector(WRITE, _payload_iov, ioc,
ARRAY_SIZE(iovstack),
iovstack, &iov, 1);
iovstack, &iov);
if (ret < 0)
return ret;
if (ret == 0)

2
security/keys/keyctl.c
View file

@ -1110,7 +1110,7 @@ long keyctl_instantiate_key_iov(key_serial_t id,
goto no_payload;
ret = rw_copy_check_uvector(WRITE, _payload_iov, ioc,
ARRAY_SIZE(iovstack), iovstack, &iov, 1);
ARRAY_SIZE(iovstack), iovstack, &iov);
if (ret < 0)
return ret;
if (ret == 0)