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[Qemu-trivial] [PATCH] crypto/ivgen-essiv: Fix problem with address sani
From: |
Thomas Huth |
Subject: |
[Qemu-trivial] [PATCH] crypto/ivgen-essiv: Fix problem with address sanitizer of Clang |
Date: |
Tue, 2 Jan 2018 16:37:45 +0100 |
When compiling QEMU with clang and -fsanitize=address, I get the
following error:
==9185==ERROR: AddressSanitizer: stack-buffer-overflow on address
0x7ffc7e9adf2f at pc 0x564cba001d88 bp 0x7ffc7e9adeb0 sp 0x7ffc7e9adea8
READ of size 16 at 0x7ffc7e9adf2f thread T0
#0 0x564cba001d87 in qcrypto_ivgen_essiv_calculate
.../crypto/ivgen-essiv.c:83
#1 0x564cba001367 in qcrypto_ivgen_calculate .../crypto/ivgen.c:72
#2 0x564cb9fec630 in test_ivgen .../tests/test-crypto-ivgen.c:148
#3 0x7f98f4224b39 (/lib64/libglib-2.0.so.0+0x6fb39)
#4 0x7f98f4224d02 (/lib64/libglib-2.0.so.0+0x6fd02)
#5 0x7f98f4224d02 (/lib64/libglib-2.0.so.0+0x6fd02)
#6 0x7f98f4224d02 (/lib64/libglib-2.0.so.0+0x6fd02)
#7 0x7f98f4224f0d (/lib64/libglib-2.0.so.0+0x6ff0d)
#8 0x7f98f4224f30 (/lib64/libglib-2.0.so.0+0x6ff30)
#9 0x564cb9fec446 in main .../tests/test-crypto-ivgen.c:173
#10 0x7f98f294fc04 in __libc_start_main (/lib64/libc.so.6+0x21c04)
#11 0x564cb9fec1ac in _start (.../tests/test-crypto-ivgen+0xdb1ac)
Address 0x7ffc7e9adf2f is located in stack of thread T0 at offset 47 in frame
#0 0x564cba00192f in qcrypto_ivgen_essiv_calculate
.../crypto/ivgen-essiv.c:76
And indeed, the code is doing a "memcpy(data, (uint8_t *)§or, ndata)"
here with "sector" being a uint64_t variable and ndata = 16.
Fix it by limiting the size of the memcpy correctly.
Signed-off-by: Thomas Huth <address@hidden>
---
crypto/ivgen-essiv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/crypto/ivgen-essiv.c b/crypto/ivgen-essiv.c
index cba20bd..8944609 100644
--- a/crypto/ivgen-essiv.c
+++ b/crypto/ivgen-essiv.c
@@ -79,7 +79,7 @@ static int qcrypto_ivgen_essiv_calculate(QCryptoIVGen *ivgen,
uint8_t *data = g_new(uint8_t, ndata);
sector = cpu_to_le64(sector);
- memcpy(data, (uint8_t *)§or, ndata);
+ memcpy(data, (uint8_t *)§or, MIN(ndata, sizeof(sector)));
if (sizeof(sector) < ndata) {
memset(data + sizeof(sector), 0, ndata - sizeof(sector));
}
--
1.8.3.1
- [Qemu-trivial] [PATCH] crypto/ivgen-essiv: Fix problem with address sanitizer of Clang,
Thomas Huth <=