diff options
| -rw-r--r-- | arch/s390/include/asm/system.h | 2 | ||||
| -rw-r--r-- | arch/s390/mm/maccess.c | 56 | ||||
| -rw-r--r-- | drivers/s390/char/zcore.c | 20 |
3 files changed, 60 insertions, 18 deletions
diff --git a/arch/s390/include/asm/system.h b/arch/s390/include/asm/system.h index 6582f69f238..afb849e4bf4 100644 --- a/arch/s390/include/asm/system.h +++ b/arch/s390/include/asm/system.h @@ -114,6 +114,8 @@ extern void pfault_fini(void); extern void cmma_init(void); extern int memcpy_real(void *, void *, size_t); extern void copy_to_absolute_zero(void *dest, void *src, size_t count); +extern int copy_to_user_real(void __user *dest, void *src, size_t count); +extern int copy_from_user_real(void *dest, void __user *src, size_t count); #define finish_arch_switch(prev) do { \ set_fs(current->thread.mm_segment); \ diff --git a/arch/s390/mm/maccess.c b/arch/s390/mm/maccess.c index 5dbbaa6e594..1cb8427bedf 100644 --- a/arch/s390/mm/maccess.c +++ b/arch/s390/mm/maccess.c @@ -11,6 +11,7 @@ #include <linux/kernel.h> #include <linux/types.h> #include <linux/errno.h> +#include <linux/gfp.h> #include <asm/system.h> /* @@ -60,6 +61,9 @@ long probe_kernel_write(void *dst, const void *src, size_t size) return copied < 0 ? -EFAULT : 0; } +/* + * Copy memory in real mode (kernel to kernel) + */ int memcpy_real(void *dest, void *src, size_t count) { register unsigned long _dest asm("2") = (unsigned long) dest; @@ -101,3 +105,55 @@ void copy_to_absolute_zero(void *dest, void *src, size_t count) __ctl_load(cr0, 0, 0); preempt_enable(); } + +/* + * Copy memory from kernel (real) to user (virtual) + */ +int copy_to_user_real(void __user *dest, void *src, size_t count) +{ + int offs = 0, size, rc; + char *buf; + + buf = (char *) __get_free_page(GFP_KERNEL); + if (!buf) + return -ENOMEM; + rc = -EFAULT; + while (offs < count) { + size = min(PAGE_SIZE, count - offs); + if (memcpy_real(buf, src + offs, size)) + goto out; + if (copy_to_user(dest + offs, buf, size)) + goto out; + offs += size; + } + rc = 0; +out: + free_page((unsigned long) buf); + return rc; +} + +/* + * Copy memory from user (virtual) to kernel (real) + */ +int copy_from_user_real(void *dest, void __user *src, size_t count) +{ + int offs = 0, size, rc; + char *buf; + + buf = (char *) __get_free_page(GFP_KERNEL); + if (!buf) + return -ENOMEM; + rc = -EFAULT; + while (offs < count) { + size = min(PAGE_SIZE, count - offs); + if (copy_from_user(buf, src + offs, size)) + goto out; + if (memcpy_real(dest + offs, buf, size)) + goto out; + offs += size; + } + rc = 0; +out: + free_page((unsigned long) buf); + return rc; +} diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c index 3b94044027c..f4f1da213e2 100644 --- a/drivers/s390/char/zcore.c +++ b/drivers/s390/char/zcore.c @@ -142,22 +142,6 @@ static int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count) return memcpy_hsa(dest, src, count, TO_KERNEL); } -static int memcpy_real_user(void __user *dest, unsigned long src, size_t count) -{ - static char buf[4096]; - int offs = 0, size; - - while (offs < count) { - size = min(sizeof(buf), count - offs); - if (memcpy_real(buf, (void *) src + offs, size)) - return -EFAULT; - if (copy_to_user(dest + offs, buf, size)) - return -EFAULT; - offs += size; - } - return 0; -} - static int __init init_cpu_info(enum arch_id arch) { struct save_area *sa; @@ -346,8 +330,8 @@ static ssize_t zcore_read(struct file *file, char __user *buf, size_t count, /* Copy from real mem */ size = count - mem_offs - hdr_count; - rc = memcpy_real_user(buf + hdr_count + mem_offs, mem_start + mem_offs, - size); + rc = copy_to_user_real(buf + hdr_count + mem_offs, + (void *) mem_start + mem_offs, size); if (rc) goto fail; |