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Message-ID: <20120130145114.4c084a6a@Gantu.yeoh.info>
Date: Mon, 30 Jan 2012 14:51:14 +1030
From: Christopher Yeoh <cyeoh@....ibm.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org
Cc: Oleg Nesterov <oleg@...hat.com>
Subject: [PATCH] Cleanup of rw_copy_check_uvector and
compat_rw_copy_check_uvector
Hi Andrew,
This is the cleanup of rw_copy_check_uvector and
compat_rw_copy_check_uvector discussed with Oleg a couple of weeks a
go. Its a much better way of handling that the functions sometimes
need to omit checking the memory that the iovecs point to compared to
what I originally did for CMA.
Regards,
Chris
--
cyeoh@...ibm.com
Signed-off-by: Chris Yeoh <yeohc@....ibm.com>
fs/aio.c | 4 ++--
fs/compat.c | 6 +++---
fs/read_write.c | 7 +++----
include/linux/compat.h | 3 +--
include/linux/fs.h | 10 ++++++++--
mm/process_vm_access.c | 16 ++++++++--------
security/keys/compat.c | 2 +-
security/keys/keyctl.c | 2 +-
8 files changed, 27 insertions(+), 23 deletions(-)
diff --git a/fs/aio.c b/fs/aio.c
index 969beb0..149f60bc 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1467,13 +1467,13 @@ 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;
diff --git a/fs/compat.c b/fs/compat.c
index fa9d721..ff1437d 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -539,7 +539,7 @@ 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;
@@ -586,7 +586,7 @@ 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;
@@ -1101,7 +1101,7 @@ 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;
diff --git a/fs/read_write.c b/fs/read_write.c
index 5ad4248..1d8ae78 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -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;
diff --git a/include/linux/compat.h b/include/linux/compat.h
index 41c9f65..9961ec3 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -547,8 +547,7 @@ 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);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 0244082..461d689 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -169,6 +169,13 @@ 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
@@ -1660,8 +1667,7 @@ 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 *);
diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c
index 82b6824..3a5d779 100644
--- a/mm/process_vm_access.c
+++ b/mm/process_vm_access.c
@@ -368,15 +368,15 @@ 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;
@@ -435,16 +435,16 @@ 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;
diff --git a/security/keys/compat.c b/security/keys/compat.c
index 4c48e13..338b510 100644
--- a/security/keys/compat.c
+++ b/security/keys/compat.c
@@ -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)
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index 0b3f5d7..eca5191 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -1065,7 +1065,7 @@ 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)
--
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