An unchecked decrement operation in cl_print() would cause a few
integers to underflow. Where an output terminal's state is stored in
cl_term, the values cl_term->ystart and cl_term->pos.y both underflow.
This can be replicated with the following steps:
1. Get to the GRUB command line
2. Hold dow
Hello everyone,
I was messing around in the GRUB command line and I found two related
integer underflows that occur on all platforms. I also found an
out-of-bounds write that occurs only on i386 systems using the VGA text
terminal. This out-of-bounds write is caused by one of the underflows,
but I
Coordinates passed to screen_write_char() did not have any checks to
ensure they are not out-of-bounds. This adds an if statement to prevent
out-of-bounds writes to the VGA text buffer.
Signed-off-by: Ryan Cohen
---
grub-core/term/i386/pc/vga_text.c | 3 ++-
1 file changed, 2 insertions(+), 1 de
Thank you Glenn !
Your answer was very helpful, the Cutmem i think worked, but the other one
did not.
*From a machine that had already usuntu installed and running, i knew that
if the modifications worked, then if i run in terminal sudo Dmesg , i
should see something like this:*
*[0.00] r
Just noticed that there's a typo in the title ("file UUID file") so
please make sure to remove one of the "file" from the commit title if
this patch does get validated for integration.
Thanks,
/Pete
On 2022.11.25 17:22, Pete Batard wrote:
The final piece needed to add UEFI file system trans
