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Date: Sat, 12 Jan 2008 22:20:37 +1100 (EST)
From: James Morris <jmorris@...ei.org>
To: linux-fsdevel@...r.kernel.org
cc: linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: [PATCH][RFC] security: call security_file_permission from rw_verify_area
Please review.
Tested with SELinux in enforcing mode.
---
All instances of rw_verify_area() are followed by a call to
security_file_permission(), so just call the latter from the former.
Signed-off-by: James Morris <jmorris@...ei.org>
---
fs/compat.c | 4 ---
fs/read_write.c | 63 +++++++++++++++++++++----------------------------------
fs/splice.c | 8 -------
3 files changed, 24 insertions(+), 51 deletions(-)
diff --git a/fs/compat.c b/fs/compat.c
index 15078ce..5216c3f 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1104,10 +1104,6 @@ static ssize_t compat_do_readv_writev(int type, struct file *file,
if (ret < 0)
goto out;
- ret = security_file_permission(file, type == READ ? MAY_READ:MAY_WRITE);
- if (ret)
- goto out;
-
fnv = NULL;
if (type == READ) {
fn = file->f_op->read;
diff --git a/fs/read_write.c b/fs/read_write.c
index ea1f94c..c4d3d17 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -197,25 +197,27 @@ int rw_verify_area(int read_write, struct file *file, loff_t *ppos, size_t count
{
struct inode *inode;
loff_t pos;
+ int retval = -EINVAL;
inode = file->f_path.dentry->d_inode;
if (unlikely((ssize_t) count < 0))
- goto Einval;
+ return retval;
pos = *ppos;
if (unlikely((pos < 0) || (loff_t) (pos + count) < 0))
- goto Einval;
+ return retval;
if (unlikely(inode->i_flock && mandatory_lock(inode))) {
- int retval = locks_mandatory_area(
+ retval = locks_mandatory_area(
read_write == READ ? FLOCK_VERIFY_READ : FLOCK_VERIFY_WRITE,
inode, file, pos, count);
if (retval < 0)
return retval;
}
+ retval = security_file_permission(file,
+ read_write == READ ? MAY_READ : MAY_WRITE);
+ if (retval)
+ return retval;
return count > MAX_RW_COUNT ? MAX_RW_COUNT : count;
-
-Einval:
- return -EINVAL;
}
static void wait_on_retry_sync_kiocb(struct kiocb *iocb)
@@ -267,18 +269,15 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
ret = rw_verify_area(READ, file, pos, count);
if (ret >= 0) {
count = ret;
- ret = security_file_permission (file, MAY_READ);
- if (!ret) {
- if (file->f_op->read)
- ret = file->f_op->read(file, buf, count, pos);
- else
- ret = do_sync_read(file, buf, count, pos);
- if (ret > 0) {
- fsnotify_access(file->f_path.dentry);
- add_rchar(current, ret);
- }
- inc_syscr(current);
+ if (file->f_op->read)
+ ret = file->f_op->read(file, buf, count, pos);
+ else
+ ret = do_sync_read(file, buf, count, pos);
+ if (ret > 0) {
+ fsnotify_access(file->f_path.dentry);
+ add_rchar(current, ret);
}
+ inc_syscr(current);
}
return ret;
@@ -325,18 +324,15 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_
ret = rw_verify_area(WRITE, file, pos, count);
if (ret >= 0) {
count = ret;
- ret = security_file_permission (file, MAY_WRITE);
- if (!ret) {
- if (file->f_op->write)
- ret = file->f_op->write(file, buf, count, pos);
- else
- ret = do_sync_write(file, buf, count, pos);
- if (ret > 0) {
- fsnotify_modify(file->f_path.dentry);
- add_wchar(current, ret);
- }
- inc_syscw(current);
+ if (file->f_op->write)
+ ret = file->f_op->write(file, buf, count, pos);
+ else
+ ret = do_sync_write(file, buf, count, pos);
+ if (ret > 0) {
+ fsnotify_modify(file->f_path.dentry);
+ add_wchar(current, ret);
}
+ inc_syscw(current);
}
return ret;
@@ -603,9 +599,6 @@ static ssize_t do_readv_writev(int type, struct file *file,
ret = rw_verify_area(type, file, pos, tot_len);
if (ret < 0)
goto out;
- ret = security_file_permission(file, type == READ ? MAY_READ : MAY_WRITE);
- if (ret)
- goto out;
fnv = NULL;
if (type == READ) {
@@ -737,10 +730,6 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
goto fput_in;
count = retval;
- retval = security_file_permission (in_file, MAY_READ);
- if (retval)
- goto fput_in;
-
/*
* Get output file, and verify that it is ok..
*/
@@ -759,10 +748,6 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
goto fput_out;
count = retval;
- retval = security_file_permission (out_file, MAY_WRITE);
- if (retval)
- goto fput_out;
-
if (!max)
max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes);
diff --git a/fs/splice.c b/fs/splice.c
index 6bdcb61..56b802b 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -908,10 +908,6 @@ static long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
if (unlikely(ret < 0))
return ret;
- ret = security_file_permission(out, MAY_WRITE);
- if (unlikely(ret < 0))
- return ret;
-
return out->f_op->splice_write(pipe, out, ppos, len, flags);
}
@@ -934,10 +930,6 @@ static long do_splice_to(struct file *in, loff_t *ppos,
if (unlikely(ret < 0))
return ret;
- ret = security_file_permission(in, MAY_READ);
- if (unlikely(ret < 0))
- return ret;
-
return in->f_op->splice_read(in, ppos, pipe, len, flags);
}
--
1.5.3.7
--
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