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ima: Fix a potential integer overflow in ima_appraise_measurement

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[ Upstream commit d2ee2cfc4aa85ff6a2a3b198a3a524ec54e3d999 ]

When the ima-modsig is enabled, the rc passed to evm_verifyxattr() may be
negative, which may cause the integer overflow problem.

Fixes: 39b0709636 ("ima: Implement support for module-style appended signatures")
Signed-off-by: Huaxin Lu <luhuaxin1@huawei.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Huaxin Lu 2022-07-05 13:14:17 +08:00 • committed by Greg Kroah-Hartman
commit 388f3df7c3
1 changed files with 2 additions and 1 deletions
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3
security/integrity/ima/ima_appraise.c
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@ -352,7 +352,8 @@ int ima_appraise_measurement(enum ima_hooks func,
goto out;
}
status = evm_verifyxattr(dentry, XATTR_NAME_IMA, xattr_value, rc, iint);
status = evm_verifyxattr(dentry, XATTR_NAME_IMA, xattr_value,
rc < 0 ? 0 : rc, iint);
switch (status) {
case INTEGRITY_PASS:
case INTEGRITY_PASS_IMMUTABLE: