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authorLinus Torvalds <torvalds@linux-foundation.org>2016-08-09 00:48:14 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-08-09 00:48:14 +0300
commit1eccfa090eaea22558570054bbdc147817e1df5e (patch)
treea0adfdb87319abef88f575ee34314649193b7e92 /include
parent1bd4403d86a1c06cb6cc9ac87664a0c9d3413d51 (diff)
parented18adc1cdd00a5c55a20fbdaed4804660772281 (diff)
downloadlinux-1eccfa090eaea22558570054bbdc147817e1df5e.tar.xz
Merge tag 'usercopy-v4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
Pull usercopy protection from Kees Cook: "Tbhis implements HARDENED_USERCOPY verification of copy_to_user and copy_from_user bounds checking for most architectures on SLAB and SLUB" * tag 'usercopy-v4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: mm: SLUB hardened usercopy support mm: SLAB hardened usercopy support s390/uaccess: Enable hardened usercopy sparc/uaccess: Enable hardened usercopy powerpc/uaccess: Enable hardened usercopy ia64/uaccess: Enable hardened usercopy arm64/uaccess: Enable hardened usercopy ARM: uaccess: Enable hardened usercopy x86/uaccess: Enable hardened usercopy mm: Hardened usercopy mm: Implement stack frame object validation mm: Add is_migrate_cma_page
Diffstat (limited to 'include')
-rw-r--r--include/linux/mmzone.h2
-rw-r--r--include/linux/slab.h12
-rw-r--r--include/linux/thread_info.h24
3 files changed, 38 insertions, 0 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index f2e4e90621ec..d572b78b65e1 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -68,8 +68,10 @@ extern char * const migratetype_names[MIGRATE_TYPES];
#ifdef CONFIG_CMA
# define is_migrate_cma(migratetype) unlikely((migratetype) == MIGRATE_CMA)
+# define is_migrate_cma_page(_page) (get_pageblock_migratetype(_page) == MIGRATE_CMA)
#else
# define is_migrate_cma(migratetype) false
+# define is_migrate_cma_page(_page) false
#endif
#define for_each_migratetype_order(order, type) \
diff --git a/include/linux/slab.h b/include/linux/slab.h
index 1a4ea551aae5..4293808d8cfb 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -155,6 +155,18 @@ void kfree(const void *);
void kzfree(const void *);
size_t ksize(const void *);
+#ifdef CONFIG_HAVE_HARDENED_USERCOPY_ALLOCATOR
+const char *__check_heap_object(const void *ptr, unsigned long n,
+ struct page *page);
+#else
+static inline const char *__check_heap_object(const void *ptr,
+ unsigned long n,
+ struct page *page)
+{
+ return NULL;
+}
+#endif
+
/*
* Some archs want to perform DMA into kmalloc caches and need a guaranteed
* alignment larger than the alignment of a 64-bit integer.
diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
index 352b1542f5cc..cbd8990e2e77 100644
--- a/include/linux/thread_info.h
+++ b/include/linux/thread_info.h
@@ -105,6 +105,30 @@ static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
+#ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES
+static inline int arch_within_stack_frames(const void * const stack,
+ const void * const stackend,
+ const void *obj, unsigned long len)
+{
+ return 0;
+}
+#endif
+
+#ifdef CONFIG_HARDENED_USERCOPY
+extern void __check_object_size(const void *ptr, unsigned long n,
+ bool to_user);
+
+static inline void check_object_size(const void *ptr, unsigned long n,
+ bool to_user)
+{
+ __check_object_size(ptr, n, to_user);
+}
+#else
+static inline void check_object_size(const void *ptr, unsigned long n,
+ bool to_user)
+{ }
+#endif /* CONFIG_HARDENED_USERCOPY */
+
#endif /* __KERNEL__ */
#endif /* _LINUX_THREAD_INFO_H */