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#ifndef _included_clib_sanitizer_h
#define _included_clib_sanitizer_h
#ifdef CLIB_SANITIZE_ADDR
#include <sanitizer/asan_interface.h>
#include <vppinfra/clib.h>
#include <vppinfra/error_bootstrap.h>
typedef struct
{
size_t shadow_scale;
size_t shadow_offset;
} clib_sanitizer_main_t;
extern clib_sanitizer_main_t sanitizer_main;
#define CLIB_NOSANITIZE_ADDR __attribute__((no_sanitize_address))
#define CLIB_MEM_POISON(a, s) ASAN_POISON_MEMORY_REGION((a), (s))
#define CLIB_MEM_UNPOISON(a, s) ASAN_UNPOISON_MEMORY_REGION((a), (s))
#define CLIB_MEM_OVERFLOW_MAX 64
static_always_inline void
sanitizer_unpoison__ (u64 *restrict *shadow_ptr, size_t *shadow_len,
const void *ptr, size_t len)
{
size_t scale, off;
if (PREDICT_FALSE (~0 == sanitizer_main.shadow_scale))
__asan_get_shadow_mapping (&sanitizer_main.shadow_scale,
&sanitizer_main.shadow_offset);
scale = sanitizer_main.shadow_scale;
off = sanitizer_main.shadow_offset;
/* compute the shadow address and length */
*shadow_len = len >> scale;
ASSERT (*shadow_len <= CLIB_MEM_OVERFLOW_MAX);
*shadow_ptr = (void *) (((clib_address_t) ptr >> scale) + off);
}
static_always_inline CLIB_NOSANITIZE_ADDR void
sanitizer_unpoison_push__ (u64 *restrict shadow, const void *ptr, size_t len)
{
u64 *restrict shadow_ptr;
size_t shadow_len;
int i;
sanitizer_unpoison__ (&shadow_ptr, &shadow_len, ptr, len);
/* save the shadow area */
for (i = 0; i < shadow_len; i++)
shadow[i] = shadow_ptr[i];
/* unpoison */
for (i = 0; i < shadow_len; i++)
shadow_ptr[i] = 0;
}
static_always_inline CLIB_NOSANITIZE_ADDR void
sanitizer_unpoison_pop__ (const u64 *restrict shadow, const void *ptr,
size_t len)
{
u64 *restrict shadow_ptr;
size_t shadow_len;
int i;
sanitizer_unpoison__ (&shadow_ptr, &shadow_len, ptr, len);
/* restore the shadow area */
for (i = 0; i < shadow_len; i++)
{
ASSERT (0 == shadow_ptr[i]);
shadow_ptr[i] = shadow[i];
}
}
#define CLIB_MEM_OVERFLOW(f, src, n) \
({ \
typeof (f) clib_mem_overflow_ret__; \
const void *clib_mem_overflow_src__ = (src); \
size_t clib_mem_overflow_n__ = (n); \
u64 clib_mem_overflow_shadow__[CLIB_MEM_OVERFLOW_MAX]; \
sanitizer_unpoison_push__ (clib_mem_overflow_shadow__, \
clib_mem_overflow_src__, \
clib_mem_overflow_n__); \
clib_mem_overflow_ret__ = f; \
sanitizer_unpoison_pop__ (clib_mem_overflow_shadow__, \
clib_mem_overflow_src__, \
clib_mem_overflow_n__); \
clib_mem_overflow_ret__; \
})
#define CLIB_MEM_OVERFLOW_LOAD(f, src) \
({ \
typeof(src) clib_mem_overflow_load_src__ = (src); \
CLIB_MEM_OVERFLOW(f(clib_mem_overflow_load_src__), clib_mem_overflow_load_src__, sizeof(typeof(f(clib_mem_overflow_load_src__)))); \
})
static_always_inline void
CLIB_MEM_POISON_LEN (void *src, size_t oldlen, size_t newlen)
{
if (oldlen > newlen)
CLIB_MEM_POISON (src + newlen, oldlen - newlen);
else if (newlen > oldlen)
CLIB_MEM_UNPOISON (src + oldlen, newlen - oldlen);
}
#else /* CLIB_SANITIZE_ADDR */
#define CLIB_NOSANITIZE_ADDR
#define CLIB_MEM_POISON(a, s) (void)(a)
#define CLIB_MEM_UNPOISON(a, s) (void)(a)
#define CLIB_MEM_OVERFLOW(a, b, c) a
#define CLIB_MEM_OVERFLOW_LOAD(f, src) f(src)
#define CLIB_MEM_POISON_LEN(a, b, c)
#endif /* CLIB_SANITIZE_ADDR */
/*
* clang tends to force alignment of all sections when compiling for address
* sanitizer. This confuse VPP plugin infra, prevent clang to do that
* On the contrary, GCC does not support this kind of attribute on sections
* sigh.
*/
#ifdef __clang__
#define CLIB_NOSANITIZE_PLUGIN_REG_SECTION CLIB_NOSANITIZE_ADDR
#else
#define CLIB_NOSANITIZE_PLUGIN_REG_SECTION
#endif
#endif /* _included_clib_sanitizer_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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