On 26.10.17 20:52, Collin L. Walling wrote:
The sclp console in the s390 bios writes raw data,
leading console emulators (such as virsh console) to
treat a new line ('\n') as just a new line instead
of as a Unix line feed. Because of this, output
appears in a "stair case" pattern.
Let's print \r\n on every occurrence of a new line
in the string passed to write to amend this issue.
This is in sync with the guest Linux code in
drivers/s390/char/sclp_vt220.c which also does a line feed
conversion in the console part of the driver.
This fixes the s390-ccw and s390-netboot output like
$ virsh start test --console
Domain test started
Connected to domain test
Escape character is ^]
Network boot starting...
Using MAC address: 02:01:02:03:04:05
Requesting information via DHCP: 010
Signed-off-by: Collin L. Walling <address@hidden>
Signed-off-by: Christian Borntraeger <address@hidden>
---
pc-bios/s390-ccw/sclp.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/pc-bios/s390-ccw/sclp.c b/pc-bios/s390-ccw/sclp.c
index 486fce1..f8ad5ae 100644
--- a/pc-bios/s390-ccw/sclp.c
+++ b/pc-bios/s390-ccw/sclp.c
@@ -68,17 +68,27 @@ void sclp_setup(void)
long write(int fd, const void *str, size_t len)
{
WriteEventData *sccb = (void *)_sccb;
+ const char *p = str;
+ size_t data_len = 0;
+ size_t i;
if (fd != 1 && fd != 2) {
return -EIO;
}
- sccb->h.length = sizeof(WriteEventData) + len;
+ for (i = len; i > 0; i--) {
Where did the bounds check go? If you write(max) before, you were
writing max bytes. If you do it now, you end up writing max + n bytes
and potentially overflow the array, no?
Alex