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authorJeff Moyer <jmoyer@redhat.com>2010-05-26 14:44:26 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-05-27 09:12:53 -0700
commit9d85cba718efeef9ca00ce3f7f34f5880737aa9b (patch)
treed445d35d915b65dac171e58f83c75feb15d625fd /fs/aio.c
parentb83733639a494d5f42fa00a2506563fbd2d3015d (diff)
downloadlinux-stericsson-9d85cba718efeef9ca00ce3f7f34f5880737aa9b.tar.gz
aio: fix the compat vectored operations
The aio compat code was not converting the struct iovecs from 32bit to 64bit pointers, causing either EINVAL to be returned from io_getevents, or EFAULT as the result of the I/O. This patch passes a compat flag to io_submit to signal that pointer conversion is necessary for a given iocb array. A variant of this was tested by Michael Tokarev. I have also updated the libaio test harness to exercise this code path with good success. Further, I grabbed a copy of ltp and ran the testcases/kernel/syscall/readv and writev tests there (compiled with -m32 on my 64bit system). All seems happy, but extra eyes on this would be welcome. [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: fix CONFIG_COMPAT=n build] Signed-off-by: Jeff Moyer <jmoyer@redhat.com> Reported-by: Michael Tokarev <mjt@tls.msk.ru> Cc: Zach Brown <zach.brown@oracle.com> Cc: <stable@kernel.org> [2.6.35.1] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/aio.c')
-rw-r--r--fs/aio.c65
1 files changed, 41 insertions, 24 deletions
diff --git a/fs/aio.c b/fs/aio.c
index 1cf12b3dd83a..48fdeebdb544 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -36,6 +36,7 @@
#include <linux/blkdev.h>
#include <linux/mempool.h>
#include <linux/hash.h>
+#include <linux/compat.h>
#include <asm/kmap_types.h>
#include <asm/uaccess.h>
@@ -1384,13 +1385,22 @@ static ssize_t aio_fsync(struct kiocb *iocb)
return ret;
}
-static ssize_t aio_setup_vectored_rw(int type, struct kiocb *kiocb)
+static ssize_t aio_setup_vectored_rw(int type, struct kiocb *kiocb, bool compat)
{
ssize_t ret;
- ret = rw_copy_check_uvector(type, (struct iovec __user *)kiocb->ki_buf,
- kiocb->ki_nbytes, 1,
- &kiocb->ki_inline_vec, &kiocb->ki_iovec);
+#ifdef CONFIG_COMPAT
+ if (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);
+ 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);
if (ret < 0)
goto out;
@@ -1420,7 +1430,7 @@ static ssize_t aio_setup_single_vector(struct kiocb *kiocb)
* Performs the initial checks and aio retry method
* setup for the kiocb at the time of io submission.
*/
-static ssize_t aio_setup_iocb(struct kiocb *kiocb)
+static ssize_t aio_setup_iocb(struct kiocb *kiocb, bool compat)
{
struct file *file = kiocb->ki_filp;
ssize_t ret = 0;
@@ -1469,7 +1479,7 @@ static ssize_t aio_setup_iocb(struct kiocb *kiocb)
ret = security_file_permission(file, MAY_READ);
if (unlikely(ret))
break;
- ret = aio_setup_vectored_rw(READ, kiocb);
+ ret = aio_setup_vectored_rw(READ, kiocb, compat);
if (ret)
break;
ret = -EINVAL;
@@ -1483,7 +1493,7 @@ static ssize_t aio_setup_iocb(struct kiocb *kiocb)
ret = security_file_permission(file, MAY_WRITE);
if (unlikely(ret))
break;
- ret = aio_setup_vectored_rw(WRITE, kiocb);
+ ret = aio_setup_vectored_rw(WRITE, kiocb, compat);
if (ret)
break;
ret = -EINVAL;
@@ -1548,7 +1558,8 @@ static void aio_batch_free(struct hlist_head *batch_hash)
}
static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
- struct iocb *iocb, struct hlist_head *batch_hash)
+ struct iocb *iocb, struct hlist_head *batch_hash,
+ bool compat)
{
struct kiocb *req;
struct file *file;
@@ -1609,7 +1620,7 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
req->ki_left = req->ki_nbytes = iocb->aio_nbytes;
req->ki_opcode = iocb->aio_lio_opcode;
- ret = aio_setup_iocb(req);
+ ret = aio_setup_iocb(req, compat);
if (ret)
goto out_put_req;
@@ -1637,20 +1648,8 @@ out_put_req:
return ret;
}
-/* sys_io_submit:
- * Queue the nr iocbs pointed to by iocbpp for processing. Returns
- * the number of iocbs queued. May return -EINVAL if the aio_context
- * specified by ctx_id is invalid, if nr is < 0, if the iocb at
- * *iocbpp[0] is not properly initialized, if the operation specified
- * is invalid for the file descriptor in the iocb. May fail with
- * -EFAULT if any of the data structures point to invalid data. May
- * fail with -EBADF if the file descriptor specified in the first
- * iocb is invalid. May fail with -EAGAIN if insufficient resources
- * are available to queue any iocbs. Will return 0 if nr is 0. Will
- * fail with -ENOSYS if not implemented.
- */
-SYSCALL_DEFINE3(io_submit, aio_context_t, ctx_id, long, nr,
- struct iocb __user * __user *, iocbpp)
+long do_io_submit(aio_context_t ctx_id, long nr,
+ struct iocb __user *__user *iocbpp, bool compat)
{
struct kioctx *ctx;
long ret = 0;
@@ -1687,7 +1686,7 @@ SYSCALL_DEFINE3(io_submit, aio_context_t, ctx_id, long, nr,
break;
}
- ret = io_submit_one(ctx, user_iocb, &tmp, batch_hash);
+ ret = io_submit_one(ctx, user_iocb, &tmp, batch_hash, compat);
if (ret)
break;
}
@@ -1697,6 +1696,24 @@ SYSCALL_DEFINE3(io_submit, aio_context_t, ctx_id, long, nr,
return i ? i : ret;
}
+/* sys_io_submit:
+ * Queue the nr iocbs pointed to by iocbpp for processing. Returns
+ * the number of iocbs queued. May return -EINVAL if the aio_context
+ * specified by ctx_id is invalid, if nr is < 0, if the iocb at
+ * *iocbpp[0] is not properly initialized, if the operation specified
+ * is invalid for the file descriptor in the iocb. May fail with
+ * -EFAULT if any of the data structures point to invalid data. May
+ * fail with -EBADF if the file descriptor specified in the first
+ * iocb is invalid. May fail with -EAGAIN if insufficient resources
+ * are available to queue any iocbs. Will return 0 if nr is 0. Will
+ * fail with -ENOSYS if not implemented.
+ */
+SYSCALL_DEFINE3(io_submit, aio_context_t, ctx_id, long, nr,
+ struct iocb __user * __user *, iocbpp)
+{
+ return do_io_submit(ctx_id, nr, iocbpp, 0);
+}
+
/* lookup_kiocb
* Finds a given iocb for cancellation.
*/