On Sat, 6 Dec 2003, Pavel harry_x Palát wrote: > > It would be less intrusive to the kernel to supply a fixed do_brk() > > and replace the do_brk with a jump to your version. > > I've written similar patch few days ago. The patch only modifies first > instructions of do_brk() (it replaces them with jmp to function in LKM. > It can be downloaded from http://wizard.ath.cx/fixbrk.tar.gz > > But beware, I wrote it in rush and it's pretty odly written :-) But it > worked on my two servers (both were running 2.4.21 kernel with grsecurity > patch). > Sometimes it might be valuable to patch your fixbrk.pl. Your version does: system("gcc -D__KERNEL__ -DMODULE -c -o _fixbrk.o fixbrk.c"); On some hosts, to compile this module you need to specify the path to kernel header files. For example: system("gcc -D__KERNEL__ -DMODULE -I/usr/src/linux/include -c -o _fixbrk.o fixbrk.c"); Otherwise you might end up with something like: /usr/include/asm/processor.h:56: error: `CONFIG_X86_L1_CACHE_SHIFT' undeclared here (not in a function) Regards, -- Mariusz Wołoszyn Internet Security Specialist, GTS - Internet Partners
