35 lines
1.2 KiB
Diff
35 lines
1.2 KiB
Diff
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From 2e978dc652969f6a7089713d8f726dda23a98205 Mon Sep 17 00:00:00 2001
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From: Bruce Rogers <brogers@suse.com>
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Date: Fri, 27 Mar 2015 18:03:36 -0600
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Subject: [PATCH] smbios: avoid having an arbitrary _SM_ string located in F
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segment
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The way the SMBIOS table is located is to search the F segment for
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the byte sequence _SM_ located at the beginning of a paragragh.
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It was found that SeaBIOS has a "_SM_" string contained within
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the image which is not part of the SMBIOS table, and it was located
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ahead of the actual SMBIOS table, causing obvious problems.
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Signed-off-by: Bruce Rogers <brogers@suse.com>
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---
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src/fw/biostables.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/src/fw/biostables.c b/src/fw/biostables.c
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index 50a891b..568f404 100644
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--- a/src/fw/biostables.c
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+++ b/src/fw/biostables.c
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@@ -271,7 +271,8 @@ copy_smbios(void *pos)
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if (SMBiosAddr)
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return;
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struct smbios_entry_point *p = pos;
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- if (memcmp(p->anchor_string, "_SM_", 4))
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+ // avoid storing the _SM_ string - it's problematic!
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+ if (memcmp(p->anchor_string, "_SM", 3) || p->anchor_string[3] != '_' )
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return;
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if (checksum(pos, 0x10) != 0)
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return;
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--
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1.9.0
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