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kcore: register module area in generic way

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Some archs define MODULED_VADDR/MODULES_END which is not in VMALLOC area.
This is handled only in x86-64.  This patch make it more generic.  And we
can use vread/vwrite to access the area.  Fix it.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KAMEZAWA Hiroyuki 2009-09-22 16:45:49 -07:00 committed by Linus Torvalds
parent 26562c59fa
commit 81ac3ad906
4 changed files with 28 additions and 5 deletions
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4
arch/x86/mm/init_64.c
View file

@ -647,7 +647,7 @@ EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
#endif /* CONFIG_MEMORY_HOTPLUG */
static struct kcore_list kcore_modules, kcore_vsyscall;
static struct kcore_list kcore_vsyscall;
void __init mem_init(void)
{
@ -676,8 +676,6 @@ void __init mem_init(void)
initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
/* Register memory areas for /proc/kcore */
kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN,
KCORE_OTHER);
kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START,
VSYSCALL_END - VSYSCALL_START, KCORE_OTHER);

19
fs/proc/kcore.c
View file

@ -490,7 +490,7 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
if (m == NULL) {
if (clear_user(buffer, tsz))
return -EFAULT;
} else if (is_vmalloc_addr((void *)start)) {
} else if (is_vmalloc_or_module_addr((void *)start)) {
char * elf_buf;
elf_buf = kzalloc(tsz, GFP_KERNEL);
@ -586,6 +586,22 @@ static void __init proc_kcore_text_init(void)
}
#endif
#if defined(CONFIG_MODULES) && defined(MODULES_VADDR)
/*
* MODULES_VADDR has no intersection with VMALLOC_ADDR.
*/
struct kcore_list kcore_modules;
static void __init add_modules_range(void)
{
kclist_add(&kcore_modules, (void *)MODULES_VADDR,
MODULES_END - MODULES_VADDR, KCORE_VMALLOC);
}
#else
static void __init add_modules_range(void)
{
}
#endif
static int __init proc_kcore_init(void)
{
proc_root_kcore = proc_create("kcore", S_IRUSR, NULL,
@ -595,6 +611,7 @@ static int __init proc_kcore_init(void)
/* Store vmalloc area */
kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
VMALLOC_END - VMALLOC_START, KCORE_VMALLOC);
add_modules_range();
/* Store direct-map area from physical memory map */
kcore_update_ram();
hotplug_memory_notifier(kcore_callback, 0);

8
include/linux/mm.h
View file

@ -285,6 +285,14 @@ static inline int is_vmalloc_addr(const void *x)
return 0;
#endif
}
#ifdef CONFIG_MMU
extern int is_vmalloc_or_module_addr(const void *x);
#else
static int is_vmalloc_or_module_addr(const void *x)
{
return 0;
}
#endif
static inline struct page *compound_head(struct page *page)
{

2
mm/vmalloc.c
View file

@ -184,7 +184,7 @@ static int vmap_page_range(unsigned long start, unsigned long end,
return ret;
}
static inline int is_vmalloc_or_module_addr(const void *x)
int is_vmalloc_or_module_addr(const void *x)
{
/*
* ARM, x86-64 and sparc64 put modules in a special place,