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Subject[PATCH v2] security: Restore passing final prot to ima_file_mmap()
Date
From: Roberto Sassu <roberto.sassu@huawei.com>

Commit 98de59bfe4b2f ("take calculation of final prot in
security_mmap_file() into a helper") moved the code to update prot with the
actual protection flags to be granted to the requestor by the kernel to a
helper called mmap_prot(). However, the patch didn't update the argument
passed to ima_file_mmap(), making it receive the requested prot instead of
the final computed prot.

A possible consequence is that files mmapped as executable might not be
measured/appraised if PROT_EXEC is not requested but subsequently added in
the final prot.

Replace prot with mmap_prot(file, prot) as the second argument of
ima_file_mmap() to restore the original behavior.

Cc: stable@vger.kernel.org
Fixes: 98de59bfe4b2 ("take calculation of final prot in security_mmap_file() into a helper")
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
---
security/security.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/security.c b/security/security.c
index d1571900a8c7..0d2359d588a1 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1666,7 +1666,7 @@ int security_mmap_file(struct file *file, unsigned long prot,
mmap_prot(file, prot), flags);
if (ret)
return ret;
- return ima_file_mmap(file, prot);
+ return ima_file_mmap(file, mmap_prot(file, prot));
}

int security_mmap_addr(unsigned long addr)
--
2.25.1
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