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qemu-io: don't allow I/O operations larger than BDRV_REQUEST_MAX_BYTES 

Passing a request size larger than BDRV_REQUEST_MAX_BYTES to any of the
I/O commands results in an error. While 'read' and 'write' handle the
error correctly, 'aio_read' and 'aio_write' hit an assertion:

blk_aio_read_entry: Assertion `rwco->qiov->size == acb->bytes' failed.

The reason is that the QEMU I/O code cannot handle request sizes
larger than BDRV_REQUEST_MAX_BYTES, so this patch makes qemu-io check
that all values are within range.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Message-id: 79f66648c685929a144396bda24d13a207131dcf.1485878688.git.berto@igalia.com
[mreitz: Use BDRV_REQUEST_MAX_BYTES instead of INT_MAX]
Signed-off-by: Max Reitz <mreitz@redhat.com>
master
Alberto Garcia 2017-01-31 18:09:54 +02:00 committed by Max Reitz
parent 7061a07898
commit 3026c4688c
1 changed files with 13 additions and 7 deletions
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20
qemu-io-cmds.c
View File

@ -388,9 +388,15 @@ create_iovec(BlockBackend *blk, QEMUIOVector *qiov, char **argv, int nr_iov,
goto fail;
}
if (len > SIZE_MAX) {
printf("Argument '%s' exceeds maximum size %llu\n", arg,
(unsigned long long)SIZE_MAX);
if (len > BDRV_REQUEST_MAX_BYTES) {
printf("Argument '%s' exceeds maximum size %" PRIu64 "\n", arg,
(uint64_t)BDRV_REQUEST_MAX_BYTES);
goto fail;
}
if (count > BDRV_REQUEST_MAX_BYTES - len) {
printf("The total number of bytes exceed the maximum size %" PRIu64
"\n", (uint64_t)BDRV_REQUEST_MAX_BYTES);
goto fail;
}
@ -682,9 +688,9 @@ static int read_f(BlockBackend *blk, int argc, char **argv)
if (count < 0) {
print_cvtnum_err(count, argv[optind]);
return 0;
} else if (count > SIZE_MAX) {
} else if (count > BDRV_REQUEST_MAX_BYTES) {
printf("length cannot exceed %" PRIu64 ", given %s\n",
(uint64_t) SIZE_MAX, argv[optind]);
(uint64_t)BDRV_REQUEST_MAX_BYTES, argv[optind]);
return 0;
}
@ -1004,9 +1010,9 @@ static int write_f(BlockBackend *blk, int argc, char **argv)
if (count < 0) {
print_cvtnum_err(count, argv[optind]);
return 0;
} else if (count > SIZE_MAX) {
} else if (count > BDRV_REQUEST_MAX_BYTES) {
printf("length cannot exceed %" PRIu64 ", given %s\n",
(uint64_t) SIZE_MAX, argv[optind]);
(uint64_t)BDRV_REQUEST_MAX_BYTES, argv[optind]);
return 0;
}