From: Jory Pratt Updated patch for kernel 2.6.32 The credits/description from the original version of this patch remain accurate and are included below. -- From: Gordon Malm Allow PaX options to be selected without first selecting CONFIG_GRKERNSEC. This patch has been updated to keep current with newer kernel versions. The original version of this patch contained no credits/description. --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -658,10 +658,12 @@ #ifdef CONFIG_PAX_KERNEXEC if (init_mm.start_code <= address && address < init_mm.end_code) { +#ifdef CONFIG_GRKERNSEC if (current->signal->curr_ip) printk(KERN_ERR "PAX: From %pI4: %s:%d, uid/euid: %u/%u, attempted to modify kernel code\n", ¤t->signal->curr_ip, current->comm, task_pid_nr(current), current_uid(), current_euid()); else +#endif printk(KERN_ERR "PAX: %s:%d, uid/euid: %u/%u, attempted to modify kernel code\n", current->comm, task_pid_nr(current), current_uid(), current_euid()); } --- a/fs/exec.c +++ b/fs/exec.c @@ -1806,9 +1806,11 @@ } up_read(&mm->mmap_sem); } +#ifdef CONFIG_GRKERNSEC if (tsk->signal->curr_ip) printk(KERN_ERR "PAX: From %pI4: execution attempt in: %s, %08lx-%08lx %08lx\n", &tsk->signal->curr_ip, path_fault, start, end, offset); else +#endif printk(KERN_ERR "PAX: execution attempt in: %s, %08lx-%08lx %08lx\n", path_fault, start, end, offset); printk(KERN_ERR "PAX: terminating task: %s(%s):%d, uid/euid: %u/%u, " "PC: %p, SP: %p\n", path_exec, tsk->comm, task_pid_nr(tsk), @@ -1823,10 +1825,12 @@ #ifdef CONFIG_PAX_REFCOUNT void pax_report_refcount_overflow(struct pt_regs *regs) { +#ifdef CONFIG_GRKERNSEC if (current->signal->curr_ip) printk(KERN_ERR "PAX: From %pI4: refcount overflow detected in: %s:%d, uid/euid: %u/%u\n", ¤t->signal->curr_ip, current->comm, task_pid_nr(current), current_uid(), current_euid()); else +#endif printk(KERN_ERR "PAX: refcount overflow detected in: %s:%d, uid/euid: %u/%u\n", current->comm, task_pid_nr(current), current_uid(), current_euid()); print_symbol(KERN_ERR "PAX: refcount overflow occured at: %s\n", instruction_pointer(regs)); @@ -1886,10 +1890,12 @@ void pax_report_leak_to_user(const void *ptr, unsigned long len) { +#ifdef CONFIG_GRKERNSEC if (current->signal->curr_ip) printk(KERN_ERR "PAX: From %pI4: kernel memory leak attempt detected from %p (%lu bytes)\n", ¤t->signal->curr_ip, ptr, len); else +#endif printk(KERN_ERR "PAX: kernel memory leak attempt detected from %p (%lu bytes)\n", ptr, len); dump_stack(); do_group_exit(SIGKILL); @@ -1897,10 +1903,12 @@ void pax_report_overflow_from_user(const void *ptr, unsigned long len) { +#ifdef CONFIG_GRKERNSEC if (current->signal->curr_ip) printk(KERN_ERR "PAX: From %pI4: kernel memory overflow attempt detected to %p (%lu bytes)\n", ¤t->signal->curr_ip, ptr, len); else +#endif printk(KERN_ERR "PAX: kernel memory overflow attempt detected to %p (%lu bytes)\n", ptr, len); dump_stack(); do_group_exit(SIGKILL); --- a/security/Kconfig +++ b/security/Kconfig @@ -26,7 +26,7 @@ config PAX bool "Enable various PaX features" - depends on GRKERNSEC && (ALPHA || ARM || AVR32 || IA64 || MIPS || PARISC || PPC || SPARC || X86) + depends on (ALPHA || ARM || AVR32 || IA64 || MIPS || PARISC || PPC || SPARC || X86) help This allows you to enable various PaX features. PaX adds intrusion prevention mechanisms to the kernel that reduce