From: Arjan van de Ven Make /dev/kmem a config option; /dev/kmem is VERY rarely used, and when used, it's generally for no good (rootkits tend to be the most common users). With this config option, users have the choice to disable /dev/kmem, saving some size as well. A patch to disable /dev/kmem has been in the Fedora and RHEL kernels for 4+ years now without any known problems or legit users of /dev/kmem. Signed-off-by: Arjan van de Ven Signed-off-by: Andrew Morton --- drivers/char/Kconfig | 8 ++++++++ drivers/char/mem.c | 10 ++++++++++ 2 files changed, 18 insertions(+) diff -puN drivers/char/Kconfig~make-dev-kmem-a-config-option drivers/char/Kconfig --- a/drivers/char/Kconfig~make-dev-kmem-a-config-option +++ a/drivers/char/Kconfig @@ -80,6 +80,14 @@ config VT_HW_CONSOLE_BINDING information. For framebuffer console users, please refer to . +config DEVKMEM + bool "/dev/kmem virtual device support" + help + Say Y here if you want to support the /dev/kmem device. The + /dev/kmem device is rarely used, but can be used for certain + kind of kernel debugging operations. + When in doubt, say "N". + config SERIAL_NONSTANDARD bool "Non-standard serial port support" depends on HAS_IOMEM diff -puN drivers/char/mem.c~make-dev-kmem-a-config-option drivers/char/mem.c --- a/drivers/char/mem.c~make-dev-kmem-a-config-option +++ a/drivers/char/mem.c @@ -295,6 +295,7 @@ static int mmap_mem(struct file * file, return 0; } +#ifdef CONFIG_DEVKMEM static int mmap_kmem(struct file * file, struct vm_area_struct * vma) { unsigned long pfn; @@ -315,6 +316,7 @@ static int mmap_kmem(struct file * file, vma->vm_pgoff = pfn; return mmap_mem(file, vma); } +#endif #ifdef CONFIG_CRASH_DUMP /* @@ -353,6 +355,7 @@ static ssize_t read_oldmem(struct file * extern long vread(char *buf, char *addr, unsigned long count); extern long vwrite(char *buf, char *addr, unsigned long count); +#ifdef CONFIG_DEVKMEM /* * This function reads the *virtual* memory as seen by the kernel. */ @@ -557,6 +560,7 @@ static ssize_t write_kmem(struct file * *ppos = p; return virtr + wrote; } +#endif #ifdef CONFIG_DEVPORT static ssize_t read_port(struct file * file, char __user * buf, @@ -734,6 +738,7 @@ static const struct file_operations mem_ .get_unmapped_area = get_unmapped_area_mem, }; +#ifdef CONFIG_DEVKMEM static const struct file_operations kmem_fops = { .llseek = memory_lseek, .read = read_kmem, @@ -742,6 +747,7 @@ static const struct file_operations kmem .open = open_kmem, .get_unmapped_area = get_unmapped_area_mem, }; +#endif static const struct file_operations null_fops = { .llseek = null_lseek, @@ -820,11 +826,13 @@ static int memory_open(struct inode * in filp->f_mapping->backing_dev_info = &directly_mappable_cdev_bdi; break; +#ifdef CONFIG_DEVKMEM case 2: filp->f_op = &kmem_fops; filp->f_mapping->backing_dev_info = &directly_mappable_cdev_bdi; break; +#endif case 3: filp->f_op = &null_fops; break; @@ -873,7 +881,9 @@ static const struct { const struct file_operations *fops; } devlist[] = { /* list of minor devices */ {1, "mem", S_IRUSR | S_IWUSR | S_IRGRP, &mem_fops}, +#ifdef CONFIG_DEVKMEM {2, "kmem", S_IRUSR | S_IWUSR | S_IRGRP, &kmem_fops}, +#endif {3, "null", S_IRUGO | S_IWUGO, &null_fops}, #ifdef CONFIG_DEVPORT {4, "port", S_IRUSR | S_IWUSR | S_IRGRP, &port_fops}, _