From: Vitaly Chikunov <vt@altlinux.org>
To: Mimi Zohar <zohar@linux.vnet.ibm.com>,
Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
linux-integrity@vger.kernel.org
Subject: [PATCH v2 1/5] ima-evm-utils: Fix null dereference from file2bin to memcpy
Date: Mon, 15 Jul 2019 23:05:49 +0300 [thread overview]
Message-ID: <20190715200553.22403-1-vt@altlinux.org> (raw)
file2bin() may return NULL, which is set to tmp, which is passed to
memcpy. Add explicit check for it.
Fixes: CID 229904.
---
src/evmctl.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/src/evmctl.c b/src/evmctl.c
index a6d07c9..d6e0b2c 100644
--- a/src/evmctl.c
+++ b/src/evmctl.c
@@ -821,7 +821,15 @@ static int verify_ima(const char *file)
if (sigfile) {
void *tmp = file2bin(file, "sig", &len);
- assert(len <= sizeof(sig));
+ if (!tmp) {
+ log_err("Failed reading: %s\n", file);
+ return -1;
+ }
+ if (len > sizeof(sig)) {
+ log_err("Signature file is too big: %s\n", file);
+ free(tmp);
+ return -1;
+ }
memcpy(sig, tmp, len);
free(tmp);
} else {
--
2.11.0
next reply other threads:[~2019-07-15 20:06 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-15 20:05 Vitaly Chikunov [this message]
2019-07-15 20:05 ` [PATCH v2 2/5] ima-evm-utils: Fix possible xattr_value overflows in calc_evm_hash Vitaly Chikunov
2019-07-15 20:05 ` [PATCH v2 3/5] ima-evm-utils: Fix memory leak in get_password Vitaly Chikunov
2019-07-15 20:05 ` [PATCH v2 4/5] ima-evm-utils: Fix file2bin stat and fopen relations Vitaly Chikunov
2019-07-15 20:05 ` [PATCH v2 5/5] ima-evm-utils: Add more error checking in add_file_hash Vitaly Chikunov
2019-07-16 14:46 ` [PATCH v2 1/5] ima-evm-utils: Fix null dereference from file2bin to memcpy Mimi Zohar
2019-07-16 14:59 ` Vitaly Chikunov
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