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Message-ID: <be546f62-6d0d-4e30-9565-ea8ebc891961@collabora.com>
Date: Wed, 17 Apr 2024 11:43:28 +0500
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Cc: Muhammad Usama Anjum <usama.anjum@collabora.com>, jeffxu@google.com,
 jorgelo@chromium.org, groeck@chromium.org, linux-kernel@vger.kernel.org,
 linux-kselftest@vger.kernel.org, linux-mm@kvack.org, jannh@google.com,
 sroettger@google.com, pedro.falcato@gmail.com, dave.hansen@intel.com,
 linux-hardening@vger.kernel.org, willy@infradead.org,
 gregkh@linuxfoundation.org, torvalds@linux-foundation.org,
 deraadt@openbsd.org, corbet@lwn.net, Liam.Howlett@oracle.com,
 surenb@google.com, merimus@google.com, rdunlap@infradead.org
Subject: Re: [PATCH 1/1] selftest mm/mseal: style change
To: jeffxu@chromium.org, akpm@linux-foundation.org, keescook@chromium.org
References: <20240416220944.2481203-1-jeffxu@chromium.org>
 <20240416220944.2481203-2-jeffxu@chromium.org>
Content-Language: en-US
From: Muhammad Usama Anjum <usama.anjum@collabora.com>
In-Reply-To: <20240416220944.2481203-2-jeffxu@chromium.org>
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On 4/17/24 3:09 AM, jeffxu@chromium.org wrote:
> From: Jeff Xu <jeffxu@chromium.org>
> 
> remove "assert" from testcase.
> remove "return 0"
Thanks

> 
> Signed-off-by: Jeff Xu <jeffxu@chromium.org>
> Suggested-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Reviewed-by: Muhammad Usama Anjum <usama.anjum@collabora.com>

> ---
>  tools/testing/selftests/mm/mseal_test.c | 124 +++++++++++++++++-------
>  tools/testing/selftests/mm/seal_elf.c   |   3 -
>  2 files changed, 91 insertions(+), 36 deletions(-)
> 
> diff --git a/tools/testing/selftests/mm/mseal_test.c b/tools/testing/selftests/mm/mseal_test.c
> index 06c780d1d8e5..4a326334726d 100644
> --- a/tools/testing/selftests/mm/mseal_test.c
> +++ b/tools/testing/selftests/mm/mseal_test.c
> @@ -12,9 +12,7 @@
>  #include <errno.h>
>  #include <stdio.h>
>  #include <stdlib.h>
> -#include <assert.h>
>  #include <fcntl.h>
> -#include <assert.h>
>  #include <sys/ioctl.h>
>  #include <sys/vfs.h>
>  #include <sys/stat.h>
> @@ -189,7 +187,6 @@ static void __write_pkey_reg(u64 pkey_reg)
>  
>  	asm volatile(".byte 0x0f,0x01,0xef\n\t"
>  			: : "a" (eax), "c" (ecx), "d" (edx));
> -	assert(pkey_reg == __read_pkey_reg());
>  #endif
>  }
>  
> @@ -214,7 +211,6 @@ static void set_pkey(int pkey, unsigned long pkey_value)
>  	unsigned long mask = (PKEY_DISABLE_ACCESS | PKEY_DISABLE_WRITE);
>  	u64 new_pkey_reg;
>  
> -	assert(!(pkey_value & ~mask));
>  	new_pkey_reg = set_pkey_bits(__read_pkey_reg(), pkey, pkey_value);
>  	__write_pkey_reg(new_pkey_reg);
>  }
> @@ -224,7 +220,6 @@ static void setup_single_address(int size, void **ptrOut)
>  	void *ptr;
>  
>  	ptr = sys_mmap(NULL, size, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
> -	assert(ptr != (void *)-1);
>  	*ptrOut = ptr;
>  }
>  
> @@ -234,24 +229,21 @@ static void setup_single_address_rw(int size, void **ptrOut)
>  	unsigned long mapflags = MAP_ANONYMOUS | MAP_PRIVATE;
>  
>  	ptr = sys_mmap(NULL, size, PROT_READ | PROT_WRITE, mapflags, -1, 0);
> -	assert(ptr != (void *)-1);
>  	*ptrOut = ptr;
>  }
>  
> -static void clean_single_address(void *ptr, int size)
> +static int clean_single_address(void *ptr, int size)
>  {
>  	int ret;
> -
>  	ret = munmap(ptr, size);
> -	assert(!ret);
> +	return ret;
>  }
>  
> -static void seal_single_address(void *ptr, int size)
> +static int seal_single_address(void *ptr, int size)
>  {
>  	int ret;
> -
>  	ret = sys_mseal(ptr, size);
> -	assert(!ret);
> +	return ret;
>  }
>  
>  bool seal_support(void)
> @@ -290,6 +282,7 @@ static void test_seal_addseal(void)
>  	unsigned long size = 4 * page_size;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	ret = sys_mseal(ptr, size);
>  	FAIL_TEST_IF_FALSE(!ret);
> @@ -305,6 +298,7 @@ static void test_seal_unmapped_start(void)
>  	unsigned long size = 4 * page_size;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	/* munmap 2 pages from ptr. */
>  	ret = sys_munmap(ptr, 2 * page_size);
> @@ -332,6 +326,7 @@ static void test_seal_unmapped_middle(void)
>  	unsigned long size = 4 * page_size;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	/* munmap 2 pages from ptr + page. */
>  	ret = sys_munmap(ptr + page_size, 2 * page_size);
> @@ -363,6 +358,7 @@ static void test_seal_unmapped_end(void)
>  	unsigned long size = 4 * page_size;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	/* unmap last 2 pages. */
>  	ret = sys_munmap(ptr + 2 * page_size, 2 * page_size);
> @@ -391,6 +387,7 @@ static void test_seal_multiple_vmas(void)
>  	unsigned long size = 4 * page_size;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	/* use mprotect to split the vma into 3. */
>  	ret = sys_mprotect(ptr + page_size, 2 * page_size,
> @@ -421,6 +418,7 @@ static void test_seal_split_start(void)
>  	unsigned long size = 4 * page_size;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	/* use mprotect to split at middle */
>  	ret = sys_mprotect(ptr, 2 * page_size, PROT_READ | PROT_WRITE);
> @@ -445,6 +443,7 @@ static void test_seal_split_end(void)
>  	unsigned long size = 4 * page_size;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	/* use mprotect to split at middle */
>  	ret = sys_mprotect(ptr, 2 * page_size, PROT_READ | PROT_WRITE);
> @@ -469,7 +468,9 @@ static void test_seal_invalid_input(void)
>  	int ret;
>  
>  	setup_single_address(8 * page_size, &ptr);
> -	clean_single_address(ptr + 4 * page_size, 4 * page_size);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
> +	ret = clean_single_address(ptr + 4 * page_size, 4 * page_size);
> +	FAIL_TEST_IF_FALSE(!ret);
>  
>  	/* invalid flag */
>  	ret = syscall(__NR_mseal, ptr, size, 0x20);
> @@ -502,6 +503,7 @@ static void test_seal_zero_length(void)
>  	int ret;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	ret = sys_mprotect(ptr, 0, PROT_READ | PROT_WRITE);
>  	FAIL_TEST_IF_FALSE(!ret);
> @@ -551,6 +553,7 @@ static void test_seal_twice(void)
>  	unsigned long size = 4 * page_size;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	ret = sys_mseal(ptr, size);
>  	FAIL_TEST_IF_FALSE(!ret);
> @@ -570,9 +573,12 @@ static void test_seal_mprotect(bool seal)
>  	int ret;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
> -	if (seal)
> -		seal_single_address(ptr, size);
> +	if (seal) {
> +		ret = seal_single_address(ptr, size);
> +		FAIL_TEST_IF_FALSE(!ret);
> +	}
>  
>  	ret = sys_mprotect(ptr, size, PROT_READ | PROT_WRITE);
>  	if (seal)
> @@ -591,9 +597,12 @@ static void test_seal_start_mprotect(bool seal)
>  	int ret;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
> -	if (seal)
> -		seal_single_address(ptr, page_size);
> +	if (seal) {
> +		ret = seal_single_address(ptr, page_size);
> +		FAIL_TEST_IF_FALSE(!ret);
> +	}
>  
>  	/* the first page is sealed. */
>  	ret = sys_mprotect(ptr, page_size, PROT_READ | PROT_WRITE);
> @@ -618,9 +627,12 @@ static void test_seal_end_mprotect(bool seal)
>  	int ret;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
> -	if (seal)
> -		seal_single_address(ptr + page_size, 3 * page_size);
> +	if (seal) {
> +		ret = seal_single_address(ptr + page_size, 3 * page_size);
> +		FAIL_TEST_IF_FALSE(!ret);
> +	}
>  
>  	/* first page is not sealed */
>  	ret = sys_mprotect(ptr, page_size, PROT_READ | PROT_WRITE);
> @@ -645,9 +657,12 @@ static void test_seal_mprotect_unalign_len(bool seal)
>  	int ret;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
> -	if (seal)
> -		seal_single_address(ptr, page_size * 2 - 1);
> +	if (seal) {
> +		ret = seal_single_address(ptr, page_size * 2 - 1);
> +		FAIL_TEST_IF_FALSE(!ret);
> +	}
>  
>  	/* 2 pages are sealed. */
>  	ret = sys_mprotect(ptr, page_size * 2, PROT_READ | PROT_WRITE);
> @@ -671,8 +686,11 @@ static void test_seal_mprotect_unalign_len_variant_2(bool seal)
>  	int ret;
>  
>  	setup_single_address(size, &ptr);
> -	if (seal)
> -		seal_single_address(ptr, page_size * 2 + 1);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
> +	if (seal) {
> +		ret =  seal_single_address(ptr, page_size * 2 + 1);
> +		FAIL_TEST_IF_FALSE(!ret);
> +	}
>  
>  	/* 3 pages are sealed. */
>  	ret = sys_mprotect(ptr, page_size * 3, PROT_READ | PROT_WRITE);
> @@ -696,13 +714,16 @@ static void test_seal_mprotect_two_vma(bool seal)
>  	int ret;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	/* use mprotect to split */
>  	ret = sys_mprotect(ptr, page_size * 2, PROT_READ | PROT_WRITE);
>  	FAIL_TEST_IF_FALSE(!ret);
>  
> -	if (seal)
> -		seal_single_address(ptr, page_size * 4);
> +	if (seal) {
> +		ret = seal_single_address(ptr, page_size * 4);
> +		FAIL_TEST_IF_FALSE(!ret);
> +	}
>  
>  	ret = sys_mprotect(ptr, page_size * 2, PROT_READ | PROT_WRITE);
>  	if (seal)
> @@ -728,14 +749,17 @@ static void test_seal_mprotect_two_vma_with_split(bool seal)
>  	int ret;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	/* use mprotect to split as two vma. */
>  	ret = sys_mprotect(ptr, page_size * 2, PROT_READ | PROT_WRITE);
>  	FAIL_TEST_IF_FALSE(!ret);
>  
>  	/* mseal can apply across 2 vma, also split them. */
> -	if (seal)
> -		seal_single_address(ptr + page_size, page_size * 2);
> +	if (seal) {
> +		ret = seal_single_address(ptr + page_size, page_size * 2);
> +		FAIL_TEST_IF_FALSE(!ret);
> +	}
>  
>  	/* the first page is not sealed. */
>  	ret = sys_mprotect(ptr, page_size, PROT_READ | PROT_WRITE);
> @@ -772,10 +796,13 @@ static void test_seal_mprotect_partial_mprotect(bool seal)
>  	int ret;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	/* seal one page. */
> -	if (seal)
> -		seal_single_address(ptr, page_size);
> +	if (seal) {
> +		ret = seal_single_address(ptr, page_size);
> +		FAIL_TEST_IF_FALSE(!ret);
> +	}
>  
>  	/* mprotect first 2 page will fail, since the first page are sealed. */
>  	ret = sys_mprotect(ptr, 2 * page_size, PROT_READ | PROT_WRITE);
> @@ -795,6 +822,7 @@ static void test_seal_mprotect_two_vma_with_gap(bool seal)
>  	int ret;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	/* use mprotect to split. */
>  	ret = sys_mprotect(ptr, page_size, PROT_READ | PROT_WRITE);
> @@ -837,6 +865,7 @@ static void test_seal_mprotect_split(bool seal)
>  	int ret;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	/* use mprotect to split. */
>  	ret = sys_mprotect(ptr, page_size, PROT_READ | PROT_WRITE);
> @@ -873,6 +902,7 @@ static void test_seal_mprotect_merge(bool seal)
>  	int ret;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	/* use mprotect to split one page. */
>  	ret = sys_mprotect(ptr, page_size, PROT_READ | PROT_WRITE);
> @@ -906,6 +936,7 @@ static void test_seal_munmap(bool seal)
>  	int ret;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	if (seal) {
>  		ret = sys_mseal(ptr, size);
> @@ -936,6 +967,7 @@ static void test_seal_munmap_two_vma(bool seal)
>  	int ret;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	/* use mprotect to split */
>  	ret = sys_mprotect(ptr, page_size * 2, PROT_READ | PROT_WRITE);
> @@ -976,6 +1008,7 @@ static void test_seal_munmap_vma_with_gap(bool seal)
>  	int ret;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	ret = sys_munmap(ptr + page_size, page_size * 2);
>  	FAIL_TEST_IF_FALSE(!ret);
> @@ -1007,6 +1040,7 @@ static void test_munmap_start_freed(bool seal)
>  	int prot;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	/* unmap the first page. */
>  	ret = sys_munmap(ptr, page_size);
> @@ -1045,6 +1079,8 @@ static void test_munmap_end_freed(bool seal)
>  	int ret;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
> +
>  	/* unmap last page. */
>  	ret = sys_munmap(ptr + page_size * 3, page_size);
>  	FAIL_TEST_IF_FALSE(!ret);
> @@ -1074,6 +1110,8 @@ static void test_munmap_middle_freed(bool seal)
>  	int prot;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
> +
>  	/* unmap 2 pages in the middle. */
>  	ret = sys_munmap(ptr + page_size, page_size * 2);
>  	FAIL_TEST_IF_FALSE(!ret);
> @@ -1116,6 +1154,7 @@ static void test_seal_mremap_shrink(bool seal)
>  	void *ret2;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	if (seal) {
>  		ret = sys_mseal(ptr, size);
> @@ -1144,6 +1183,7 @@ static void test_seal_mremap_expand(bool seal)
>  	void *ret2;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  	/* ummap last 2 pages. */
>  	ret = sys_munmap(ptr + 2 * page_size, 2 * page_size);
>  	FAIL_TEST_IF_FALSE(!ret);
> @@ -1175,8 +1215,11 @@ static void test_seal_mremap_move(bool seal)
>  	void *ret2;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  	setup_single_address(size, &newPtr);
> -	clean_single_address(newPtr, size);
> +	FAIL_TEST_IF_FALSE(newPtr != (void *)-1);
> +	ret = clean_single_address(newPtr, size);
> +	FAIL_TEST_IF_FALSE(!ret);
>  
>  	if (seal) {
>  		ret = sys_mseal(ptr, size);
> @@ -1205,6 +1248,7 @@ static void test_seal_mmap_overwrite_prot(bool seal)
>  	void *ret2;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	if (seal) {
>  		ret = sys_mseal(ptr, size);
> @@ -1232,6 +1276,7 @@ static void test_seal_mmap_expand(bool seal)
>  	void *ret2;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  	/* ummap last 4 pages. */
>  	ret = sys_munmap(ptr + 8 * page_size, 4 * page_size);
>  	FAIL_TEST_IF_FALSE(!ret);
> @@ -1262,6 +1307,7 @@ static void test_seal_mmap_shrink(bool seal)
>  	void *ret2;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	if (seal) {
>  		ret = sys_mseal(ptr, size);
> @@ -1290,7 +1336,9 @@ static void test_seal_mremap_shrink_fixed(bool seal)
>  	void *ret2;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  	setup_single_address(size, &newAddr);
> +	FAIL_TEST_IF_FALSE(newAddr != (void *)-1);
>  
>  	if (seal) {
>  		ret = sys_mseal(ptr, size);
> @@ -1319,7 +1367,9 @@ static void test_seal_mremap_expand_fixed(bool seal)
>  	void *ret2;
>  
>  	setup_single_address(page_size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  	setup_single_address(size, &newAddr);
> +	FAIL_TEST_IF_FALSE(newAddr != (void *)-1);
>  
>  	if (seal) {
>  		ret = sys_mseal(newAddr, size);
> @@ -1348,7 +1398,9 @@ static void test_seal_mremap_move_fixed(bool seal)
>  	void *ret2;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  	setup_single_address(size, &newAddr);
> +	FAIL_TEST_IF_FALSE(newAddr != (void *)-1);
>  
>  	if (seal) {
>  		ret = sys_mseal(newAddr, size);
> @@ -1375,6 +1427,7 @@ static void test_seal_mremap_move_fixed_zero(bool seal)
>  	void *ret2;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	if (seal) {
>  		ret = sys_mseal(ptr, size);
> @@ -1406,6 +1459,7 @@ static void test_seal_mremap_move_dontunmap(bool seal)
>  	void *ret2;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	if (seal) {
>  		ret = sys_mseal(ptr, size);
> @@ -1434,6 +1488,7 @@ static void test_seal_mremap_move_dontunmap_anyaddr(bool seal)
>  	void *ret2;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	if (seal) {
>  		ret = sys_mseal(ptr, size);
> @@ -1469,6 +1524,7 @@ static void test_seal_merge_and_split(void)
>  
>  	/* (24 RO) */
>  	setup_single_address(24 * page_size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
>  	/* use mprotect(NONE) to set out boundary */
>  	/* (1 NONE) (22 RO) (1 NONE) */
> @@ -1700,9 +1756,12 @@ static void test_seal_discard_ro_anon(bool seal)
>  	int ret;
>  
>  	setup_single_address(size, &ptr);
> +	FAIL_TEST_IF_FALSE(ptr != (void *)-1);
>  
> -	if (seal)
> -		seal_single_address(ptr, size);
> +	if (seal) {
> +		ret = seal_single_address(ptr, size);
> +		FAIL_TEST_IF_FALSE(!ret);
> +	}
>  
>  	ret = sys_madvise(ptr, size, MADV_DONTNEED);
>  	if (seal)
> @@ -1832,5 +1891,4 @@ int main(int argc, char **argv)
>  	test_seal_discard_ro_anon_on_pkey(true);
>  
>  	ksft_finished();
> -	return 0;
>  }
> diff --git a/tools/testing/selftests/mm/seal_elf.c b/tools/testing/selftests/mm/seal_elf.c
> index 61a2f1c94e02..7143dc4f1b10 100644
> --- a/tools/testing/selftests/mm/seal_elf.c
> +++ b/tools/testing/selftests/mm/seal_elf.c
> @@ -12,9 +12,7 @@
>  #include <errno.h>
>  #include <stdio.h>
>  #include <stdlib.h>
> -#include <assert.h>
>  #include <fcntl.h>
> -#include <assert.h>
>  #include <sys/ioctl.h>
>  #include <sys/vfs.h>
>  #include <sys/stat.h>
> @@ -179,5 +177,4 @@ int main(int argc, char **argv)
>  	test_seal_elf();
>  
>  	ksft_finished();
> -	return 0;
>  }

-- 
BR,
Muhammad Usama Anjum