Hi, you can check the value of /proc/sys/vm/mmap_min_addr and if it is non-zero, use echo 0 > /proc/sys/vm/mmap_min_addr I am not sure what Ubuntu has been up to exactly: this is something that only works with SELinux enabled in enforcing mode. This is the help: +config SECURITY_DEFAULT_MMAP_MIN_ADDR + int "Low address space to protect from user allocation" + depends on SECURITY + default 0 + help + This is the portion of low virtual memory which should be protected + from userspace allocation. Keeping a user from writing to low pages + can help reduce the impact of kernel NULL pointer bugs. + + For most users with lots of address space a value of 65536 is + reasonable and should cause no problems. Programs which use vm86 + functionality would either need additional permissions from either + the LSM or the capabilities module or have this protection disabled. + + This value can be changed after boot using the + /proc/sys/vm/mmap_min_addr tunable. + + I am not sure how to give DOSEMU special permission -- maybe you could ask Ubuntu kernel maintainers about why they changed mmap_min_addr? (o and this is speculation on my part, perhaps there is a different problem in which case I don't know). Bart -- To unsubscribe from this list: send the line "unsubscribe linux-msdos" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
