Re: [dpdk-dev] [PATCH v3] Enable AddressSanitizer feature on DPDK

["Burakov, Anatoly" <anatoly.burakov@intel.com>]

On 18-Sep-21 8:41 AM, zhihongx.peng@intel.com wrote:
> From: Zhihong Peng <zhihongx.peng@intel.com>
> 
> AddressSanitizer (ASan) is a google memory error detect
> standard tool. It could help to detect use-after-free and
> {heap,stack,global}-buffer overflow bugs in C/C++ programs,
> print detailed error information when error happens, large
> improve debug efficiency.
> 
> By referring to its implementation algorithm
> (https://github.com/google/sanitizers/wiki/AddressSanitizerAlgorithm),
> enable heap-buffer-overflow and use-after-free functions on dpdk.
> DPDK ASAN function currently only supports on Linux x86_64.
> 
> Here is an example of heap-buffer-overflow bug:
>          ......
>          char *p = rte_zmalloc(NULL, 7, 0);
>          p[7] = 'a';
>          ......
> 
> Here is an example of use-after-free bug:
>          ......
>          char *p = rte_zmalloc(NULL, 7, 0);
>          rte_free(p);
>          *p = 'a';
>          ......
> 
> If you want to use this feature,
> you need to add below compilation options when compiling code:
> -Dbuildtype=debug -Db_lundef=false -Db_sanitize=address
> "-Dbuildtype=debug": Display code information when coredump occurs
> in the program.
> "-Db_lundef=false": It is enabled by default, and needs to be
> disabled when using asan.
> 
> Signed-off-by: Xueqin Lin <xueqin.lin@intel.com>
> Signed-off-by: Zhihong Peng <zhihongx.peng@intel.com>
> ---
>   doc/guides/prog_guide/asan.rst  | 130 ++++++++++++++++++++++
>   doc/guides/prog_guide/index.rst |   1 +
>   lib/eal/common/malloc_elem.c    |  26 ++++-
>   lib/eal/common/malloc_elem.h    | 184 +++++++++++++++++++++++++++++++-
>   lib/eal/common/malloc_heap.c    |  12 +++
>   lib/eal/common/rte_malloc.c     |   9 +-
>   lib/pipeline/rte_swx_pipeline.c |   4 +-
>   7 files changed, 359 insertions(+), 7 deletions(-)
>   create mode 100644 doc/guides/prog_guide/asan.rst
> 
> diff --git a/doc/guides/prog_guide/asan.rst b/doc/guides/prog_guide/asan.rst
> new file mode 100644
> index 0000000000..a0589d9b8a
> --- /dev/null
> +++ b/doc/guides/prog_guide/asan.rst
> @@ -0,0 +1,130 @@
> +.. Copyright (c) <2021>, Intel Corporation
> +   All rights reserved.
> +
> +Memory error detect standard tool - AddressSanitizer(Asan)
> +==========================================================
> +
> +AddressSanitizer (ASan) is a google memory error detect
> +standard tool. It could help to detect use-after-free and
> +{heap,stack,global}-buffer overflow bugs in C/C++ programs,
> +print detailed error information when error happens, large
> +improve debug efficiency.
> +
> +By referring to its implementation algorithm
> +(https://github.com/google/sanitizers/wiki/AddressSanitizerAlgorithm),
> +enabled heap-buffer-overflow and use-after-free functions on dpdk.
> +DPDK ASAN function currently only supports on Linux x86_64.

I think the description is a little to wordy and unnecessarily redundant 
(pun intended!) in places. Suggested rewording:

`AddressSanitizer 
<https://github.com/google/sanitizers/wiki/AddressSanitizer>` (ASan) is 
a widely-used debugging tool to detect memory access errors. It helps 
detect issues like use-after-free, various kinds of buffer overruns in 
C/C++ programs, and other similar errors, as well as printing out 
detailed debug information whenever an error is detected.

DPDK ASan functionality is currently only supported Linux x86_64.

> +
> +AddressSanitizer is a part of LLVM(3.1+)and GCC(4.8+).
> +
> +Example heap-buffer-overflow error
> +----------------------------------
> +
> +Following error was reported when Asan was enabled::
> +
> +    Applied 9 bytes of memory, but accessed the 10th byte of memory,
> +    so heap-buffer-overflow appeared.
> +
> +Below code results in this error::
> +
> +    char *p = rte_zmalloc(NULL, 9, 0);
> +    if (!p) {
> +        printf("rte_zmalloc error.");
> +        return -1;
> +    }
> +    p[9] = 'a';
> +
> +The error log::
> +
> +    ==49433==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x7f773fafa249 at pc 0x5556b13bdae4 bp 0x7ffeb4965e40 sp 0x7ffeb4965e30 WRITE of size 1 at 0x7f773fafa249 thread T0
> +    #0 0x5556b13bdae3 in asan_heap_buffer_overflow ../app/test/test_asan_heap_buffer_overflow.c:25
> +    #1 0x5556b043e9d4 in cmd_autotest_parsed ../app/test/commands.c:71
> +    #2 0x5556b1cdd4b0 in cmdline_parse ../lib/cmdline/cmdline_parse.c:290
> +    #3 0x5556b1cd8987 in cmdline_valid_buffer ../lib/cmdline/cmdline.c:26
> +    #4 0x5556b1ce477a in rdline_char_in ../lib/cmdline/cmdline_rdline.c:421
> +    #5 0x5556b1cd923e in cmdline_in ../lib/cmdline/cmdline.c:149
> +    #6 0x5556b1cd9769 in cmdline_interact ../lib/cmdline/cmdline.c:223
> +    #7 0x5556b045f53b in main ../app/test/test.c:234
> +    #8 0x7f7f1eba90b2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
> +    #9 0x5556b043e70d in _start (/home/pzh/yyy/x86_64-native-linuxapp-gcc/app/test/dpdk-test+0x7ce70d)
> +
> +    Address 0x7f773fafa249 is a wild pointer.
> +    SUMMARY: AddressSanitizer: heap-buffer-overflow ../app/test/test_asan_heap_buffer_overflow.c:25 in asan_heap_buffer_overflow
> +    Shadow bytes around the buggy address:
> +    0x0fef67f573f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +    0x0fef67f57400: fa fa 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +    0x0fef67f57410: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +    0x0fef67f57420: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +    0x0fef67f57430: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +    =>0x0fef67f57440: 00 00 00 00 00 00 fa fa 00[01]fa 00 00 00 00 00
> +    0x0fef67f57450: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +    0x0fef67f57460: 00 00 00 00 00 00 fa fa 00 00 00 00 00 00 00 00
> +    0x0fef67f57470: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +    0x0fef67f57480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +
> +Example use-after-free error
> +----------------------------
> +
> +Following error was reported when Asan was enabled::
> +
> +    Applied for 9 bytes of memory, and accessed the first byte after
> +    released, so heap-use-after-free appeared.
> +
> +Below code results in this error::
> +
> +    char *p = rte_zmalloc(NULL, 9, 0);
> +    if (!p) {
> +        printf("rte_zmalloc error.");
> +        return -1;
> +    }
> +    rte_free(p);
> +    *p = 'a';
> +
> +The error log::
> +
> +    ==49478==ERROR: AddressSanitizer: heap-use-after-free on address 0x7fe2ffafa240 at pc 0x56409b084bc8 bp 0x7ffef62c57d0 sp 0x7ffef62c57c0 WRITE of size 1 at 0x7fe2ffafa240 thread T0
> +    #0 0x56409b084bc7 in asan_use_after_free ../app/test/test_asan_use_after_free.c:26
> +    #1 0x56409a1059d4 in cmd_autotest_parsed ../app/test/commands.c:71
> +    #2 0x56409b9a44b0 in cmdline_parse ../lib/cmdline/cmdline_parse.c:290
> +    #3 0x56409b99f987 in cmdline_valid_buffer ../lib/cmdline/cmdline.c:26
> +    #4 0x56409b9ab77a in rdline_char_in ../lib/cmdline/cmdline_rdline.c:421
> +    #5 0x56409b9a023e in cmdline_in ../lib/cmdline/cmdline.c:149
> +    #6 0x56409b9a0769 in cmdline_interact ../lib/cmdline/cmdline.c:223
> +    #7 0x56409a12653b in main ../app/test/test.c:234
> +    #8 0x7feafafc20b2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
> +    #9 0x56409a10570d in _start (/home/pzh/yyy/x86_64-native-linuxapp-gcc/app/test/dpdk-test+0x7ce70d)
> +
> +    Address 0x7fe2ffafa240 is a wild pointer.
> +    SUMMARY: AddressSanitizer: heap-use-after-free ../app/test/test_asan_use_after_free.c:26 in asan_use_after_free
> +    Shadow bytes around the buggy address:
> +    0x0ffcdff573f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +    0x0ffcdff57400: fa fa 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +    0x0ffcdff57410: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +    0x0ffcdff57420: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +    0x0ffcdff57430: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +    =>0x0ffcdff57440: 00 00 00 00 00 00 00 00[fd]fd fd fd fd fd fd fd
> +    0x0ffcdff57450: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +    0x0ffcdff57460: 00 00 00 00 00 00 fa fa 00 00 00 00 00 00 00 00
> +    0x0ffcdff57470: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +    0x0ffcdff57480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +    0x0ffcdff57490: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +
> +Usage
> +-----
> +
> +meson build
> +^^^^^^^^^^^
> +
> +To enable Asan in meson build system, use following meson build command:
> +
> +Example usage::
> +
> + meson build -Dbuildtype=debug -Db_lundef=false -Db_sanitize=address
> + ninja -C build
> +
> +.. Note::
> +
> +  a) The issue of asan wild pointer is that dpdk asan tool is not fully adapted to google asan.
> +     For example: Address 0x7fe2ffafa240 is a wild pointer.
> +  b) Centos8 needs to install libasan separately.
> +  c) If the program uses cmdline, when a memory bug occurs, need to execute the "stty echo" command.

I think all of the terms used here should be properly capitalized, e.g. 
"ASan" instead of "asan", "DPDK" instead of "dpdk", etc.

Also, i don't quite follow the 'a)' section - what exactly is a wild 
pointer? What makes a pointer 'wild', and why do we care? If the point 
is that DPDK's ASan implementation does not support all ASan features, 
then maybe this could be worded better, e.g. like so:

a) Some of the features of ASan (for example, 'wild pointers') are not 
currently supported by DPDK's implementation

> diff --git a/doc/guides/prog_guide/index.rst b/doc/guides/prog_guide/index.rst
> index 2dce507f46..df8a4b93e1 100644
> --- a/doc/guides/prog_guide/index.rst
> +++ b/doc/guides/prog_guide/index.rst
> @@ -71,3 +71,4 @@ Programmer's Guide
>       lto
>       profile_app
>       glossary
> +    asan
> diff --git a/lib/eal/common/malloc_elem.c b/lib/eal/common/malloc_elem.c
> index c2c9461f1d..bdd20a162e 100644
> --- a/lib/eal/common/malloc_elem.c
> +++ b/lib/eal/common/malloc_elem.c
> @@ -446,6 +446,8 @@ malloc_elem_alloc(struct malloc_elem *elem, size_t size, unsigned align,
>   		struct malloc_elem *new_free_elem =
>   				RTE_PTR_ADD(new_elem, size + MALLOC_ELEM_OVERHEAD);
>   
> +		asan_clear_split_alloczone(new_free_elem);
> +
>   		split_elem(elem, new_free_elem);
>   		malloc_elem_free_list_insert(new_free_elem);
>   
> @@ -458,6 +460,8 @@ malloc_elem_alloc(struct malloc_elem *elem, size_t size, unsigned align,
>   		elem->state = ELEM_BUSY;
>   		elem->pad = old_elem_size;
>   
> +		asan_clear_alloczone(elem);
> +
>   		/* put a dummy header in padding, to point to real element header */
>   		if (elem->pad > 0) { /* pad will be at least 64-bytes, as everything
>   		                     * is cache-line aligned */
> @@ -470,12 +474,18 @@ malloc_elem_alloc(struct malloc_elem *elem, size_t size, unsigned align,
>   		return new_elem;
>   	}
>   
> +	asan_clear_split_alloczone(new_elem);
> +
>   	/* we are going to split the element in two. The original element
>   	 * remains free, and the new element is the one allocated.
>   	 * Re-insert original element, in case its new size makes it
>   	 * belong on a different list.
>   	 */
> +
>   	split_elem(elem, new_elem);
> +
> +	asan_clear_alloczone(new_elem);
> +
>   	new_elem->state = ELEM_BUSY;
>   	malloc_elem_free_list_insert(elem);
>   
> @@ -601,6 +611,8 @@ malloc_elem_hide_region(struct malloc_elem *elem, void *start, size_t len)
>   	if (next && next_elem_is_adjacent(elem)) {
>   		len_after = RTE_PTR_DIFF(next, hide_end);
>   		if (len_after >= MALLOC_ELEM_OVERHEAD + MIN_DATA_SIZE) {
> +			asan_clear_split_alloczone(hide_end);
> +
>   			/* split after */
>   			split_elem(elem, hide_end);
>   
> @@ -615,6 +627,8 @@ malloc_elem_hide_region(struct malloc_elem *elem, void *start, size_t len)
>   	if (prev && prev_elem_is_adjacent(elem)) {
>   		len_before = RTE_PTR_DIFF(hide_start, elem);
>   		if (len_before >= MALLOC_ELEM_OVERHEAD + MIN_DATA_SIZE) {
> +			asan_clear_split_alloczone(hide_start);
> +
>   			/* split before */
>   			split_elem(elem, hide_start);
>   
> @@ -628,6 +642,8 @@ malloc_elem_hide_region(struct malloc_elem *elem, void *start, size_t len)
>   		}
>   	}
>   
> +	asan_clear_alloczone(elem);
> +
>   	remove_elem(elem);
>   }
>   
> @@ -641,8 +657,10 @@ malloc_elem_resize(struct malloc_elem *elem, size_t size)
>   	const size_t new_size = size + elem->pad + MALLOC_ELEM_OVERHEAD;
>   
>   	/* if we request a smaller size, then always return ok */
> -	if (elem->size >= new_size)
> +	if (elem->size >= new_size) {
> +		asan_clear_alloczone(elem);
>   		return 0;
> +	}
>   
>   	/* check if there is a next element, it's free and adjacent */
>   	if (!elem->next || elem->next->state != ELEM_FREE ||
> @@ -661,9 +679,15 @@ malloc_elem_resize(struct malloc_elem *elem, size_t size)
>   		/* now we have a big block together. Lets cut it down a bit, by splitting */
>   		struct malloc_elem *split_pt = RTE_PTR_ADD(elem, new_size);
>   		split_pt = RTE_PTR_ALIGN_CEIL(split_pt, RTE_CACHE_LINE_SIZE);
> +
> +		asan_clear_split_alloczone(split_pt);
> +
>   		split_elem(elem, split_pt);
>   		malloc_elem_free_list_insert(split_pt);
>   	}
> +
> +	asan_clear_alloczone(elem);
> +
>   	return 0;
>   }
>   
> diff --git a/lib/eal/common/malloc_elem.h b/lib/eal/common/malloc_elem.h
> index a1e5f7f02c..01a739f2ea 100644
> --- a/lib/eal/common/malloc_elem.h
> +++ b/lib/eal/common/malloc_elem.h
> @@ -7,6 +7,14 @@
>   
>   #include <stdbool.h>
>   
> +#ifdef __SANITIZE_ADDRESS__
> +#define RTE_MALLOC_ASAN
> +#elif defined(__has_feature)
> +# if __has_feature(address_sanitizer)
> +#define RTE_MALLOC_ASAN
> +# endif
> +#endif
> +
>   #define MIN_DATA_SIZE (RTE_CACHE_LINE_SIZE)
>   
>   /* dummy definition of struct so we can use pointers to it in malloc_elem struct */
> @@ -36,10 +44,20 @@ struct malloc_elem {
>   	uint64_t header_cookie;         /* Cookie marking start of data */
>   	                                /* trailer cookie at start + size */
>   #endif
> +#ifdef RTE_MALLOC_ASAN
> +	size_t user_size;
> +	uint64_t asan_cookie[2]; /*must be next to header_cookie*/
> +#endif
>   } __rte_cache_aligned;
>   
> +static const unsigned int MALLOC_ELEM_HEADER_LEN = sizeof(struct malloc_elem);
> +
>   #ifndef RTE_MALLOC_DEBUG
> -static const unsigned MALLOC_ELEM_TRAILER_LEN = 0;
> +#ifdef RTE_MALLOC_ASAN
> +static const unsigned int MALLOC_ELEM_TRAILER_LEN = RTE_CACHE_LINE_SIZE;
> +#else
> +static const unsigned int MALLOC_ELEM_TRAILER_LEN;
> +#endif
>   
>   /* dummy function - just check if pointer is non-null */
>   static inline int
> @@ -55,7 +73,7 @@ set_trailer(struct malloc_elem *elem __rte_unused){ }
>   
>   
>   #else
> -static const unsigned MALLOC_ELEM_TRAILER_LEN = RTE_CACHE_LINE_SIZE;
> +static const unsigned int MALLOC_ELEM_TRAILER_LEN = RTE_CACHE_LINE_SIZE;

This doesn't look like it's changing anything - maybe drop this 
particular hun from the patch?

>   
>   #define MALLOC_HEADER_COOKIE   0xbadbadbadadd2e55ULL /**< Header cookie. */
>   #define MALLOC_TRAILER_COOKIE  0xadd2e55badbadbadULL /**< Trailer cookie.*/
> @@ -90,9 +108,169 @@ malloc_elem_cookies_ok(const struct malloc_elem *elem)
>   
>   #endif
>   
> -static const unsigned MALLOC_ELEM_HEADER_LEN = sizeof(struct malloc_elem);
>   #define MALLOC_ELEM_OVERHEAD (MALLOC_ELEM_HEADER_LEN + MALLOC_ELEM_TRAILER_LEN)
>   
> +#ifdef RTE_MALLOC_ASAN
> +
> +#define ASAN_SHADOW_GRAIN_SIZE	8
> +#define ASAN_MEM_FREE_FLAG	0xfd
> +#define ASAN_MEM_REDZONE_FLAG	0xfa
> +#define ASAN_MEM_TO_SHADOW(mem) (((mem) >> 3) + 0x00007fff8000)

Maybe make it more pointer-safe, like so?

#define ASAN_MEM_SHIFT(mem) ((void*)((uintptr_t)mem >> 3))
#define ASAN_BASE_ADDR 0x00007fff8000
#define ASAN_MEM_TO_SHADOW(mem) RTE_PTR_ADD(ASAN_MEM_SHIFT(mem), 
ASAN_BASE_ADDR)

We could even add a new rte_common.h macros for RTE_PTR_LSHIFT/RSHIFT. 
The advantage of this suggestion is that you won't need to make so many 
typecasts any more.

> +
> +#if defined(__clang__)
> +__attribute__((no_sanitize("address", "hwaddress")))
> +#else
> +__attribute__((no_sanitize_address))
> +#endif
> +static inline void
> +asan_set_shadow(void *addr, char val)
> +{
> +	*(char *)addr = val;
> +}
> +
> +static inline void
> +asan_set_zone(void *ptr, size_t len, uint32_t val)
> +{
> +	size_t offset;
> +	char *shadow;
> +	size_t zone_len = len / ASAN_SHADOW_GRAIN_SIZE;
> +	if (len % ASAN_SHADOW_GRAIN_SIZE != 0)
> +		zone_len += 1;
> +
> +	for (size_t i = 0; i < zone_len; i++) {
> +		offset = i * ASAN_SHADOW_GRAIN_SIZE;
> +		shadow = (char *)ASAN_MEM_TO_SHADOW(((int64_t)ptr + offset));

How about

	shadow = ASAN_MEM_TO_SHADOW(RTE_PTR_ADD(ptr, offset));

? The 'shadow' variable can be void*, so you can drop the cast here too.

> +		asan_set_shadow(shadow, val);
> +	}
> +}
> +
> +/*
> + * When the memory is released, the release mark is
> + * set in the corresponding range of the shadow area.
> + */
> +static inline void
> +asan_set_freezone(void *ptr, size_t size)
> +{
> +	asan_set_zone(ptr, size, ASAN_MEM_FREE_FLAG);
> +}
> +
> +/*
> + * When the memory is allocated, memory state must set as accessible.
> + */
> +static inline void
> +asan_clear_alloczone(struct malloc_elem *elem)
> +{
> +	asan_set_zone((void *)elem, elem->size, 0x0);
> +}
> +
> +static inline void
> +asan_clear_split_alloczone(struct malloc_elem *elem)
> +{
> +	void *ptr = RTE_PTR_SUB(elem, MALLOC_ELEM_TRAILER_LEN);
> +	asan_set_zone(ptr, MALLOC_ELEM_OVERHEAD, 0x0);
> +}
> +
> +/*
> + * When the memory is allocated, the memory boundary is
> + * marked in the corresponding range of the shadow area.
> + */
> +static inline void
> +asan_set_redzone(struct malloc_elem *elem, size_t user_size)
> +{
> +	uint64_t ptr;
> +	char *shadow;
> +	if (elem != NULL) {
> +		if (elem->state != ELEM_PAD)
> +			elem = RTE_PTR_ADD(elem, elem->pad);
> +
> +		elem->user_size = user_size;
> +
> +		/* Set mark before the start of the allocated memory */
> +		ptr = (uint64_t)RTE_PTR_ADD(elem, MALLOC_ELEM_HEADER_LEN)
> +			- ASAN_SHADOW_GRAIN_SIZE;
> +		shadow = (char *)ASAN_MEM_TO_SHADOW(ptr);
> +		asan_set_shadow(shadow, ASAN_MEM_REDZONE_FLAG);
> +		shadow = (char *)ASAN_MEM_TO_SHADOW(ptr
> +				- ASAN_SHADOW_GRAIN_SIZE);
> +		asan_set_shadow(shadow, ASAN_MEM_REDZONE_FLAG);
> +
> +		/* Set mark after the end of the allocated memory */
> +		ptr = (uint64_t)RTE_PTR_ADD(elem, MALLOC_ELEM_HEADER_LEN
> +				+ elem->user_size);
> +		shadow = (char *)ASAN_MEM_TO_SHADOW(ptr);
> +		uint32_t val = (ptr % ASAN_SHADOW_GRAIN_SIZE);

I think DPDK code style is to declare all variables at the beginning of 
the block.

> +		val = (val == 0) ? ASAN_MEM_REDZONE_FLAG : val;
> +		asan_set_shadow(shadow, val);
> +		shadow = (char *)ASAN_MEM_TO_SHADOW(ptr
> +				+ ASAN_SHADOW_GRAIN_SIZE);
> +		asan_set_shadow(shadow, ASAN_MEM_REDZONE_FLAG);

It seems to me that the code can be rewritten to be more understandable. 
For example, you could opt for more meaningful variable names and not 
reuse 'ptr' for everything. Ex.:

	elem_start = RTE_PTR_ADD(elem, MALLOC_ELEM_HEADER_LEN);
	start_ptr = RTE_PTR_SUB(elem_start, ASAN_SHADOW_GRAIN_SIZE);
	start_shadow = ASAN_MEM_TO_SHADOW(start_ptr);
	// just following your code here, but why are we doing it twice?
	start_redzone = RTE_PTR_SUB(start_shadow, ASAN_SHADOW_GRAIN_SIZE);

	asan_set_shadow(start_shadow, ASAN_MEM_REDZONE_FLAG);
	asan_set_shadow(start_redzone, ASAN_MEM_REDZONE_FLAG);

	...

And similar for the rest of the code: more meaningful variable names, 
more intermediate variables, less raw bit/ptr manipulation please :)

> +	}
> +}
> +
> +/*
> + * When the memory is released, the mark of the memory boundary
> + * in the corresponding range of the shadow area is cleared.
> + */
> +static inline void
> +asan_clear_redzone(struct malloc_elem *elem)
> +{
> +	uint64_t ptr;
> +	char *shadow;
> +	if (elem != NULL) {
> +		elem = RTE_PTR_ADD(elem, elem->pad);
> +
> +		/* Clear mark before the start of the allocated memory */
> +		ptr = (uint64_t)RTE_PTR_ADD(elem, MALLOC_ELEM_HEADER_LEN)
> +			- ASAN_SHADOW_GRAIN_SIZE;
> +		shadow = (char *)ASAN_MEM_TO_SHADOW(ptr);
> +		asan_set_shadow(shadow, 0x00);
> +		shadow = (char *)ASAN_MEM_TO_SHADOW(ptr
> +				- ASAN_SHADOW_GRAIN_SIZE);
> +		asan_set_shadow(shadow, 0x00);
> +
> +		/* Clear mark after the end of the allocated memory */
> +		ptr = (uint64_t)RTE_PTR_ADD(elem, MALLOC_ELEM_HEADER_LEN
> +				+ elem->user_size);
> +		shadow = (char *)ASAN_MEM_TO_SHADOW(ptr);
> +		asan_set_shadow(shadow, 0x00);
> +		shadow = (char *)ASAN_MEM_TO_SHADOW(ptr
> +				+ ASAN_SHADOW_GRAIN_SIZE);
> +		asan_set_shadow(shadow, 0x00);

It seems to me that you're repeating a lot of code here that you already 
have in `asan_set_redzone()` - maybe factor common bits out into a 
function? For example,

static inlind void ptr_set_shadow(void *ptr, int shadow_flags) {
	startptr = RTE_PTR_SUB(ptr, ASAN_SHADOW_GRAIN_SIZE);
	shadow = ASAN_MEM_TO_SHADOW(startptr);
	asan_set_shadow(shadow, shadow_flags);
	shadow = RTE_PTR_SUB(shadow, ASAN_SHADOW_GRAIN_SIZE);
	asan_set_shadow(shadow, shadow_flags);
}

...

and then call this from wherever you like? Because this pattern seems to 
be repeating everywhere, the only difference being the ptr value and the 
set_shadow flags.

> +	}
> +}
> +
> +static inline size_t
> +old_malloc_size(struct malloc_elem *elem)
> +{
> +	if (elem->state != ELEM_PAD)
> +		elem = RTE_PTR_ADD(elem, elem->pad);
> +
> +	return elem->user_size;
> +}
> +#else
> +static inline void
> +asan_set_freezone(void *ptr __rte_unused, size_t size __rte_unused) { }
> +
> +static inline void
> +asan_clear_alloczone(struct malloc_elem *elem __rte_unused) { }
> +
> +static inline void
> +asan_clear_split_alloczone(struct malloc_elem *elem __rte_unused) { }
> +
> +static inline void
> +asan_set_redzone(struct malloc_elem *elem __rte_unused,
> +					size_t user_size __rte_unused) { }
> +
> +static inline void
> +asan_clear_redzone(struct malloc_elem *elem __rte_unused) { }
> +
> +static inline size_t
> +old_malloc_size(struct malloc_elem *elem)
> +{
> +	return elem->size - elem->pad - MALLOC_ELEM_OVERHEAD;
> +}
> +#endif
> +
>   /*
>    * Given a pointer to the start of a memory block returned by malloc, get
>    * the actual malloc_elem header for that block.
> diff --git a/lib/eal/common/malloc_heap.c b/lib/eal/common/malloc_heap.c
> index ee400f38ec..775d6789df 100644
> --- a/lib/eal/common/malloc_heap.c
> +++ b/lib/eal/common/malloc_heap.c
> @@ -237,6 +237,7 @@ heap_alloc(struct malloc_heap *heap, const char *type __rte_unused, size_t size,
>   		unsigned int flags, size_t align, size_t bound, bool contig)
>   {
>   	struct malloc_elem *elem;
> +	size_t user_size = size;
>   
>   	size = RTE_CACHE_LINE_ROUNDUP(size);
>   	align = RTE_CACHE_LINE_ROUNDUP(align);
> @@ -250,6 +251,8 @@ heap_alloc(struct malloc_heap *heap, const char *type __rte_unused, size_t size,
>   
>   		/* increase heap's count of allocated elements */
>   		heap->alloc_count++;
> +
> +		asan_set_redzone(elem, user_size);
>   	}
>   
>   	return elem == NULL ? NULL : (void *)(&elem[1]);
> @@ -270,6 +273,8 @@ heap_alloc_biggest(struct malloc_heap *heap, const char *type __rte_unused,
>   
>   		/* increase heap's count of allocated elements */
>   		heap->alloc_count++;
> +
> +		asan_set_redzone(elem, size);
>   	}
>   
>   	return elem == NULL ? NULL : (void *)(&elem[1]);
> @@ -841,6 +846,8 @@ malloc_heap_free(struct malloc_elem *elem)
>   	if (!malloc_elem_cookies_ok(elem) || elem->state != ELEM_BUSY)
>   		return -1;
>   
> +	asan_clear_redzone(elem);
> +
>   	/* elem may be merged with previous element, so keep heap address */
>   	heap = elem->heap;
>   	msl = elem->msl;
> @@ -848,6 +855,9 @@ malloc_heap_free(struct malloc_elem *elem)
>   
>   	rte_spinlock_lock(&(heap->lock));
>   
> +	void *asan_ptr = RTE_PTR_ADD(elem, MALLOC_ELEM_HEADER_LEN + elem->pad);
> +	size_t asan_data_len = elem->size - MALLOC_ELEM_OVERHEAD - elem->pad;
> +
>   	/* mark element as free */
>   	elem->state = ELEM_FREE;
>   
> @@ -1001,6 +1011,8 @@ malloc_heap_free(struct malloc_elem *elem)
>   
>   	rte_mcfg_mem_write_unlock();
>   free_unlock:
> +	asan_set_freezone(asan_ptr, asan_data_len);
> +
>   	rte_spinlock_unlock(&(heap->lock));
>   	return ret;
>   }
> diff --git a/lib/eal/common/rte_malloc.c b/lib/eal/common/rte_malloc.c
> index 9d39e58c08..d0bec26920 100644
> --- a/lib/eal/common/rte_malloc.c
> +++ b/lib/eal/common/rte_malloc.c
> @@ -162,6 +162,8 @@ rte_calloc(const char *type, size_t num, size_t size, unsigned align)
>   void *
>   rte_realloc_socket(void *ptr, size_t size, unsigned int align, int socket)
>   {
> +	size_t user_size;
> +
>   	if (ptr == NULL)
>   		return rte_malloc_socket(NULL, size, align, socket);
>   
> @@ -171,6 +173,8 @@ rte_realloc_socket(void *ptr, size_t size, unsigned int align, int socket)
>   		return NULL;
>   	}
>   
> +	user_size = size;
> +
>   	size = RTE_CACHE_LINE_ROUNDUP(size), align = RTE_CACHE_LINE_ROUNDUP(align);
>   
>   	/* check requested socket id and alignment matches first, and if ok,
> @@ -181,6 +185,9 @@ rte_realloc_socket(void *ptr, size_t size, unsigned int align, int socket)
>   			RTE_PTR_ALIGN(ptr, align) == ptr &&
>   			malloc_heap_resize(elem, size) == 0) {
>   		rte_eal_trace_mem_realloc(size, align, socket, ptr);
> +
> +		asan_set_redzone(elem, user_size);
> +
>   		return ptr;
>   	}
>   
> @@ -192,7 +199,7 @@ rte_realloc_socket(void *ptr, size_t size, unsigned int align, int socket)
>   	if (new_ptr == NULL)
>   		return NULL;
>   	/* elem: |pad|data_elem|data|trailer| */
> -	const size_t old_size = elem->size - elem->pad - MALLOC_ELEM_OVERHEAD;
> +	const size_t old_size = old_malloc_size(elem);
>   	rte_memcpy(new_ptr, ptr, old_size < size ? old_size : size);
>   	rte_free(ptr);
>   
> diff --git a/lib/pipeline/rte_swx_pipeline.c b/lib/pipeline/rte_swx_pipeline.c
> index 8eb978a30c..aaa0107d02 100644
> --- a/lib/pipeline/rte_swx_pipeline.c
> +++ b/lib/pipeline/rte_swx_pipeline.c
> @@ -6340,7 +6340,7 @@ instr_meter_translate(struct rte_swx_pipeline *p,
>   		return 0;
>   	}
>   
> -	CHECK(0, EINVAL);
> +	return -EINVAL;

Why is this here? Accidental change?

>   }
>   
>   static inline struct meter *
> @@ -8025,7 +8025,7 @@ instr_translate(struct rte_swx_pipeline *p,
>   					      instr,
>   					      data);
>   
> -	CHECK(0, EINVAL);
> +	return -EINVAL;

Same as above - accidental change?

>   }
>   
>   static struct instruction_data *
> 

-- 
Thanks,
Anatoly