From: Andy Shevchenko Date: Thu, 26 Feb 2026 11:16:44 +0000 (+0100) Subject: bitmap: Add test for out-of-boundary modifications for scatter & gather X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6b5a4b68736798df1031404a2fad06d031253ef7;p=thirdparty%2Fkernel%2Flinux.git bitmap: Add test for out-of-boundary modifications for scatter & gather Make sure that bitmap_scatter() and bitmap_gather() do not modify the bits outside of the given nbits span. Signed-off-by: Andy Shevchenko Signed-off-by: Yury Norov --- diff --git a/lib/test_bitmap.c b/lib/test_bitmap.c index c83829ef557f5..2952a6147e81c 100644 --- a/lib/test_bitmap.c +++ b/lib/test_bitmap.c @@ -354,18 +354,22 @@ static void __init test_replace(void) static const unsigned long sg_mask[] __initconst = { BITMAP_FROM_U64(0x000000000000035aULL), + BITMAP_FROM_U64(0x0000000000000000ULL), }; static const unsigned long sg_src[] __initconst = { BITMAP_FROM_U64(0x0000000000000667ULL), + BITMAP_FROM_U64(0x0000000000000000ULL), }; static const unsigned long sg_gather_exp[] __initconst = { BITMAP_FROM_U64(0x0000000000000029ULL), + BITMAP_FROM_U64(0x0000000000000000ULL), }; static const unsigned long sg_scatter_exp[] __initconst = { BITMAP_FROM_U64(0x000000000000021aULL), + BITMAP_FROM_U64(0x0000000000000000ULL), }; static void __init test_bitmap_sg(void) @@ -379,18 +383,18 @@ static void __init test_bitmap_sg(void) /* Simple gather call */ bitmap_zero(bmap_gather, 100); bitmap_gather(bmap_gather, sg_src, sg_mask, nbits); - expect_eq_bitmap(sg_gather_exp, bmap_gather, nbits); + expect_eq_bitmap(sg_gather_exp, bmap_gather, 100); /* Simple scatter call */ bitmap_zero(bmap_scatter, 100); bitmap_scatter(bmap_scatter, sg_src, sg_mask, nbits); - expect_eq_bitmap(sg_scatter_exp, bmap_scatter, nbits); + expect_eq_bitmap(sg_scatter_exp, bmap_scatter, 100); /* Scatter/gather relationship */ bitmap_zero(bmap_tmp, 100); bitmap_gather(bmap_tmp, bmap_scatter, sg_mask, nbits); bitmap_scatter(bmap_res, bmap_tmp, sg_mask, nbits); - expect_eq_bitmap(bmap_scatter, bmap_res, nbits); + expect_eq_bitmap(bmap_scatter, bmap_res, 100); } #define PARSE_TIME 0x1