linux-kernel - Re: [PATCH 05/11] test_bitmap: skip user bitmap tests for !CONFIG_SET

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Message-ID: <9e632937-9e9a-faed-bc0e-fcb7a6b4f54c@csgroup.eu>
Date:   Mon, 17 Aug 2020 09:50:05 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Christoph Hellwig <hch@....de>, Al Viro <viro@...iv.linux.org.uk>,
        Michael Ellerman <mpe@...erman.id.au>, x86@...nel.org
Cc:     linux-fsdevel@...r.kernel.org, linux-arch@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, Kees Cook <keescook@...omium.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/11] test_bitmap: skip user bitmap tests for
 !CONFIG_SET_FS



Le 17/08/2020 à 09:32, Christoph Hellwig a écrit :
> We can't run the tests for userspace bitmap parsing if set_fs() doesn't
> exist.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>   lib/test_bitmap.c | 10 ++++++++--
>   1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/lib/test_bitmap.c b/lib/test_bitmap.c
> index df903c53952bb9..49b1d25fbaf546 100644
> --- a/lib/test_bitmap.c
> +++ b/lib/test_bitmap.c
> @@ -365,6 +365,7 @@ static void __init __test_bitmap_parselist(int is_user)
>   	for (i = 0; i < ARRAY_SIZE(parselist_tests); i++) {
>   #define ptest parselist_tests[i]
>   
> +#ifdef CONFIG_SET_FS

get_fs() and set_fs() have stubs for when an arch doesn't define them, 
so I this it would be cleaner if you were using 'if 
(IS_ENABLED(CONFIG_SET_FS) && is_user)`instead of an ifdefery in the 
middle of the if/else.

Christophe


>   		if (is_user) {
>   			mm_segment_t orig_fs = get_fs();
>   			size_t len = strlen(ptest.in);
> @@ -375,7 +376,9 @@ static void __init __test_bitmap_parselist(int is_user)
>   						    bmap, ptest.nbits);
>   			time = ktime_get() - time;
>   			set_fs(orig_fs);
> -		} else {
> +		} else
> +#endif /* CONFIG_SET_FS */
> +		{
>   			time = ktime_get();
>   			err = bitmap_parselist(ptest.in, bmap, ptest.nbits);
>   			time = ktime_get() - time;
> @@ -454,6 +457,7 @@ static void __init __test_bitmap_parse(int is_user)
>   	for (i = 0; i < ARRAY_SIZE(parse_tests); i++) {
>   		struct test_bitmap_parselist test = parse_tests[i];
>   
> +#ifdef CONFIG_SET_FS
>   		if (is_user) {
>   			size_t len = strlen(test.in);
>   			mm_segment_t orig_fs = get_fs();
> @@ -464,7 +468,9 @@ static void __init __test_bitmap_parse(int is_user)
>   						bmap, test.nbits);
>   			time = ktime_get() - time;
>   			set_fs(orig_fs);
> -		} else {
> +		} else
> +#endif /* CONFIG_SET_FS */
> +		{
>   			size_t len = test.flags & NO_LEN ?
>   				UINT_MAX : strlen(test.in);
>   			time = ktime_get();
>