Hi Alon,
Alon Bar-Lev wrote:
> For boot protocol <2.02, the kernel command line is a null-terminated
> string up to 255 characters long, plus the final null. For boot protocol
>>=2.02 command line that is referred by cmd_line_ptr is null-terminated
> string, the kernel will truncate this string if it is too large to handle.
Thus, someone could use bootloaders to "patch" the kernel: If the
bootloader writes a string of arbitary length to some memory region,
then there is a fair chance that if you make the string just long
enough, the kernel image gets (partly) overwritten. It resembles a bit
"Smashing the stack for fun and profit", but this time, it's "Rewriting
the kernel to your own needs via the bootloader on x86" :)
Same thing for user defined COMMAND_LINE_SIZE. I think that a common
interface for boot loaders is required. Especially in uncontrolled multi
user environments like Universities, everything else could lead to
undesired results.
Greetings,
Georg
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
