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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/30643] New: Missing cache information on x86-64 under Intel TDX
Date: Mon, 17 Jul 2023 07:29:13 +0000 [thread overview]
Message-ID: <bug-30643-131@http.sourceware.org/bugzilla/> (raw)
https://sourceware.org/bugzilla/show_bug.cgi?id=30643
Bug ID: 30643
Summary: Missing cache information on x86-64 under Intel TDX
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: libc
Assignee: unassigned at sourceware dot org
Reporter: fweimer at redhat dot com
CC: drepper.fsp at gmail dot com
Target Milestone: ---
Flags: security-
Bug 30037 has further consequences. While the immediate crash was fixed fixed
via bug 29953, glibc still does not produce correct cache geometry information
this case:
# getconf -a | grep CACHE
LEVEL1_ICACHE_SIZE 0
LEVEL1_ICACHE_ASSOC
LEVEL1_ICACHE_LINESIZE 0
LEVEL1_DCACHE_SIZE 0
LEVEL1_DCACHE_ASSOC 0
LEVEL1_DCACHE_LINESIZE 0
LEVEL2_CACHE_SIZE 0
LEVEL2_CACHE_ASSOC 0
LEVEL2_CACHE_LINESIZE 0
LEVEL3_CACHE_SIZE 0
LEVEL3_CACHE_ASSOC 0
LEVEL3_CACHE_LINESIZE 0
LEVEL4_CACHE_SIZE 0
LEVEL4_CACHE_ASSOC
LEVEL4_CACHE_LINESIZE
Some of these values are used for splitting arrays for processing, so a value
of 0 can result in an endless loop or a division-by-zero trap.
The information is apparently available somewhere else via CPUID, but the EAX=2
query is commonly used directly by applications, so it's not really clear to me
that a glibc fix is sufficient.
The following data is from an Azure TDX instance, share with permission.
# /usr/bin/cpuid -1 -r
CPU:
0x00000000 0x00: eax=0x00000021 ebx=0x756e6547 ecx=0x6c65746e edx=0x49656e69
0x00000001 0x00: eax=0x000806f8 ebx=0x00020800 ecx=0xfffaba17 edx=0x1fabfbff
0x00000002 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x00000003 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x00000004 0x00: eax=0x00004121 ebx=0x02c0003f ecx=0x0000003f edx=0x00000000
0x00000004 0x01: eax=0x00004122 ebx=0x01c0003f ecx=0x0000003f edx=0x00000000
0x00000004 0x02: eax=0x00004143 ebx=0x03c0003f ecx=0x000007ff edx=0x00000000
0x00000004 0x03: eax=0x00004163 ebx=0x0380003f ecx=0x0001bfff edx=0x00000000
0x00000004 0x04: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x00000005 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x00000006 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x00000007 0x00: eax=0x00000001 ebx=0xf1bf2ff9 ecx=0x1b415fe6 edx=0xffd14410
0x00000007 0x01: eax=0x00001c30 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x00000008 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x00000009 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x0000000a 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x0000000b 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x0000000c 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x0000000d 0x00: eax=0x000600e7 ebx=0x00002b00 ecx=0x00002b00 edx=0x00000000
0x0000000d 0x01: eax=0x0000001f ebx=0x000029c0 ecx=0x00001800 edx=0x00000000
0x0000000d 0x02: eax=0x00000100 ebx=0x00000240 ecx=0x00000000 edx=0x00000000
0x0000000d 0x05: eax=0x00000040 ebx=0x00000440 ecx=0x00000000 edx=0x00000000
0x0000000d 0x06: eax=0x00000200 ebx=0x00000480 ecx=0x00000000 edx=0x00000000
0x0000000d 0x07: eax=0x00000400 ebx=0x00000680 ecx=0x00000000 edx=0x00000000
0x0000000d 0x0b: eax=0x00000010 ebx=0x00000000 ecx=0x00000001 edx=0x00000000
0x0000000d 0x0c: eax=0x00000018 ebx=0x00000000 ecx=0x00000001 edx=0x00000000
0x0000000d 0x11: eax=0x00000040 ebx=0x00000ac0 ecx=0x00000002 edx=0x00000000
0x0000000d 0x12: eax=0x00002000 ebx=0x00000b00 ecx=0x00000006 edx=0x00000000
0x0000000e 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x0000000f 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x00000010 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x00000011 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x00000012 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x00000012 0x01: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x00000012 0x02: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x00000013 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x00000014 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x00000015 0x00: eax=0x00000001 ebx=0x00000054 ecx=0x017d7840 edx=0x00000000
0x00000016 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x00000017 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x00000018 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x00000019 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x0000001a 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x0000001b 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x0000001b 0x01: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x0000001c 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x0000001d 0x00: eax=0x00000001 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x0000001d 0x01: eax=0x04002000 ebx=0x00080040 ecx=0x00000010 edx=0x00000000
0x0000001e 0x00: eax=0x00000000 ebx=0x00004010 ecx=0x00000000 edx=0x00000000
0x0000001f 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x0000001f 0x01: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x00000020 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x00000021 0x00: eax=0x00000000 ebx=0x65746e49 ecx=0x20202020 edx=0x5844546c
0x20000000 0x00: eax=0x00000000 ebx=0x65746e49 ecx=0x20202020 edx=0x5844546c
0x40000000 0x00: eax=0x4000000c ebx=0x7263694d ecx=0x666f736f edx=0x76482074
0x40000001 0x00: eax=0x31237648 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x40000002 0x00: eax=0x0000585d ebx=0x000a0000 ecx=0x00000001 edx=0x00000447
0x40000003 0x00: eax=0x0000ae7f ebx=0x00628030 ecx=0x00000002 edx=0xe0be47a2
0x40000004 0x00: eax=0x00360e24 ebx=0x00000fff ecx=0x00000034 edx=0x00000000
0x40000005 0x00: eax=0x00000800 ebx=0x00000800 ecx=0x00009720 edx=0x00000000
0x40000006 0x00: eax=0x0000000f ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x40000007 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x40000008 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x40000009 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x4000000a 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x4000000b 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x4000000c 0x00: eax=0x00000000 ebx=0x00000003 ecx=0x00000000 edx=0x00000000
0x40000100 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x80000000 0x00: eax=0x80000008 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x80000001 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000121 edx=0x2c100800
0x80000002 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x80000003 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x80000004 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x80000005 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x80000006 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x80000007 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
0x80000008 0x00: eax=0x00003934 ebx=0x00000200 ecx=0x00000000 edx=0x00000000
0x80860000 0x00: eax=0x00000000 ebx=0x65746e49 ecx=0x20202020 edx=0x5844546c
0xc0000000 0x00: eax=0x00000000 ebx=0x65746e49 ecx=0x20202020 edx=0x5844546c
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next reply other threads:[~2023-07-17 7:29 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-17 7:29 fweimer at redhat dot com [this message]
2023-07-17 8:46 ` [Bug libc/30643] " fweimer at redhat dot com
2023-07-17 13:49 ` decui at microsoft dot com
2023-07-18 8:41 ` fweimer at redhat dot com
2023-07-18 8:42 ` fweimer at redhat dot com
2023-07-20 22:33 ` hjl.tools at gmail dot com
2023-08-25 16:20 ` hjl.tools at gmail dot com
2023-08-28 5:20 ` fweimer at redhat dot com
2023-08-28 17:05 ` decui at microsoft dot com
2023-08-28 17:46 ` hjl.tools at gmail dot com
2023-08-28 18:24 ` decui at microsoft dot com
2023-08-28 18:29 ` decui at microsoft dot com
2023-08-28 18:33 ` fweimer at redhat dot com
2023-08-28 18:48 ` decui at microsoft dot com
2023-08-28 19:00 ` fweimer at redhat dot com
2023-08-28 19:04 ` hjl.tools at gmail dot com
2023-08-29 19:58 ` cvs-commit at gcc dot gnu.org
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