diff options
Diffstat (limited to 'target/linux/xburst/patches-3.8/0009-dev-mem-Add-kernel-config-option-to-omit-this-device.patch')
| -rw-r--r-- | target/linux/xburst/patches-3.8/0009-dev-mem-Add-kernel-config-option-to-omit-this-device.patch | 124 |
1 files changed, 0 insertions, 124 deletions
diff --git a/target/linux/xburst/patches-3.8/0009-dev-mem-Add-kernel-config-option-to-omit-this-device.patch b/target/linux/xburst/patches-3.8/0009-dev-mem-Add-kernel-config-option-to-omit-this-device.patch deleted file mode 100644 index 4ccaec5090..0000000000 --- a/target/linux/xburst/patches-3.8/0009-dev-mem-Add-kernel-config-option-to-omit-this-device.patch +++ /dev/null @@ -1,124 +0,0 @@ -From 4003b9a2c05f4d0d37535c3dffbf4a7b47d5c36c Mon Sep 17 00:00:00 2001 -From: Maarten ter Huurne <maarten@treewalker.org> -Date: Wed, 8 Sep 2010 02:31:19 +0200 -Subject: [PATCH 09/21] /dev/mem: Add kernel config option to omit this - device. - -Omitting this device prevents software from accessing the hardware directly, which can cause trouble if the kernel accesses the same hardware. -It also saves some space on embedded systems. ---- - arch/x86/Kconfig.debug | 1 + - drivers/char/Kconfig | 10 ++++++++++ - drivers/char/mem.c | 17 +++++++++++++++++ - 3 files changed, 28 insertions(+), 0 deletions(-) - ---- a/arch/x86/Kconfig.debug -+++ b/arch/x86/Kconfig.debug -@@ -7,6 +7,7 @@ source "lib/Kconfig.debug" - - config STRICT_DEVMEM - bool "Filter access to /dev/mem" -+ depends on DEVMEM - ---help--- - If this option is disabled, you allow userspace (root) access to all - of memory, including kernel and userspace memory. Accidental ---- a/drivers/char/Kconfig -+++ b/drivers/char/Kconfig -@@ -6,6 +6,16 @@ menu "Character devices" - - source "drivers/tty/Kconfig" - -+config DEVMEM -+ bool "/dev/mem virtual device support" -+ default y -+ help -+ Say Y here if you want to support the /dev/mem device. -+ Some X server drivers access the video hardware using this device. -+ Accessing hardware directly from user space can be useful in some -+ cases, but it is not without risks. -+ When in doubt, say "N". -+ - config DEVKMEM - bool "/dev/kmem virtual device support" - default y ---- a/drivers/char/mem.c -+++ b/drivers/char/mem.c -@@ -89,6 +89,8 @@ void __weak unxlate_dev_mem_ptr(unsigned - { - } - -+#ifdef CONFIG_DEVMEM -+ - /* - * This funcion reads the *physical* memory. The f_pos points directly to the - * memory location. -@@ -212,6 +214,10 @@ static ssize_t write_mem(struct file *fi - return written; - } - -+#endif -+ -+#if defined(CONFIG_DEVMEM) || defined(CONFIG_DEVKMEM) -+ - int __weak phys_mem_access_prot_allowed(struct file *file, - unsigned long pfn, unsigned long size, pgprot_t *vma_prot) - { -@@ -333,6 +339,8 @@ static int mmap_mem(struct file *file, s - return 0; - } - -+#endif -+ - #ifdef CONFIG_DEVKMEM - static int mmap_kmem(struct file *file, struct vm_area_struct *vma) - { -@@ -696,6 +704,7 @@ static loff_t null_lseek(struct file *fi - return file->f_pos = 0; - } - -+#if defined(CONFIG_DEVMEM) || defined(CONFIG_DEVKMEM) || defined(CONFIG_DEVPORT) - /* - * The memory devices use the full 32/64 bits of the offset, and so we cannot - * check against negative addresses: they are ok. The return value is weird, -@@ -728,11 +737,15 @@ static loff_t memory_lseek(struct file * - mutex_unlock(&file->f_path.dentry->d_inode->i_mutex); - return ret; - } -+#endif - -+#if defined(CONFIG_DEVMEM) || defined(CONFIG_DEVKMEM) || \ -+ defined(CONFIG_DEVPORT) || defined(CONFIG_CRASH_DUMP) - static int open_port(struct inode * inode, struct file * filp) - { - return capable(CAP_SYS_RAWIO) ? 0 : -EPERM; - } -+#endif - - #define zero_lseek null_lseek - #define full_lseek null_lseek -@@ -742,6 +755,7 @@ static int open_port(struct inode * inod - #define open_kmem open_mem - #define open_oldmem open_mem - -+#ifdef CONFIG_DEVMEM - static const struct file_operations mem_fops = { - .llseek = memory_lseek, - .read = read_mem, -@@ -750,6 +764,7 @@ static const struct file_operations mem_ - .open = open_mem, - .get_unmapped_area = get_unmapped_area_mem, - }; -+#endif - - #ifdef CONFIG_DEVKMEM - static const struct file_operations kmem_fops = { -@@ -815,7 +830,9 @@ static const struct memdev { - const struct file_operations *fops; - struct backing_dev_info *dev_info; - } devlist[] = { -+#ifdef CONFIG_DEVMEM - [1] = { "mem", 0, &mem_fops, &directly_mappable_cdev_bdi }, -+#endif - #ifdef CONFIG_DEVKMEM - [2] = { "kmem", 0, &kmem_fops, &directly_mappable_cdev_bdi }, - #endif |