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usercopy: Include offset in hardened usercopy report

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This refactors the hardened usercopy code so that failure reporting can
happen within the checking functions instead of at the top level. This
simplifies the return value handling and allows more details and offsets
to be included in the report. Having the offset can be much more helpful
in understanding hardened usercopy bugs.

Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook 2018-01-10 14:48:22 -08:00
parent b394d468e7
commit f4e6e289cb
4 changed files with 57 additions and 72 deletions
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12
include/linux/slab.h
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@ -167,15 +167,11 @@ 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);
void __check_heap_object(const void *ptr, unsigned long n, struct page *page,
bool to_user);
#else
static inline const char *__check_heap_object(const void *ptr,
unsigned long n,
struct page *page)
{
return NULL;
}
static inline void __check_heap_object(const void *ptr, unsigned long n,
struct page *page, bool to_user) { }
#endif
/*