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Date: Wed, 11 Jul 2018 10:15:34 +0800
From: <zrlw@...a.com>
To: "Greg KH" <greg@...ah.com>, "oss-security" <oss-security@...ts.openwall.com>,
Cc: "Solar Designer" <solar@...nwall.com>
Subject: Re: mmap vulnerability in motion eye video4linux driver for Sony Vaio PictureBook
i think commit be83bbf80682 maybe has a problem: if file_mmap_size_max return 0 (not regular, not block, fmode & FMODE_UNSIGNED_OFFSET == true) , maxsize will be set to -len, correct?
+static inline bool file_mmap_ok(struct file *file, struct inode *inode,
+ unsigned long pgoff, unsigned long len)
+{
+ u64 maxsize = file_mmap_size_max(file, inode);
+
+ if (maxsize && len > maxsize)
+ return false;
+ maxsize -= len; <== maxsize = -len when file_mmap_size_max return 0
+ if (pgoff > maxsize >> PAGE_SHIFT)
+ return false;
+ return true;
+}
+
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