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openSUSE:Leap:15.4:ARM
grub2.27714
0021-normal-charset-Fix-array-out-of-bounds-for...
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File 0021-normal-charset-Fix-array-out-of-bounds-formatting-un.patch of Package grub2.27714
From f3c0abfc30c4917970ffbd3890a4dbf2ae816397 Mon Sep 17 00:00:00 2001 From: Daniel Axtens <dja@axtens.net> Date: Tue, 13 Jul 2021 13:24:38 +1000 Subject: [PATCH 21/37] normal/charset: Fix array out-of-bounds formatting unicode for display In some cases attempting to display arbitrary binary strings leads to ASAN splats reading the widthspec array out of bounds. Check the index. If it would be out of bounds, return a width of 1. I don't know if that's strictly correct, but we're not really expecting great display of arbitrary binary data, and it's certainly not worse than an OOB read. Signed-off-by: Daniel Axtens <dja@axtens.net> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com> --- grub-core/normal/charset.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/grub-core/normal/charset.c b/grub-core/normal/charset.c index 4dfcc31078..7a5a7c153c 100644 --- a/grub-core/normal/charset.c +++ b/grub-core/normal/charset.c @@ -395,6 +395,8 @@ grub_unicode_estimate_width (const struct grub_unicode_glyph *c) { if (grub_unicode_get_comb_type (c->base)) return 0; + if (((unsigned long) (c->base >> 3)) >= ARRAY_SIZE (widthspec)) + return 1; if (widthspec[c->base >> 3] & (1 << (c->base & 7))) return 2; else -- 2.34.1
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