4.16-stable review patch. If anyone has any objections, please let me know.
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From: Linus Torvalds torvalds@linux-foundation.org
commit 423913ad4ae5b3e8fb8983f70969fb522261ba26 upstream.
Commit be83bbf80682 ("mmap: introduce sane default mmap limits") was introduced to catch problems in various ad-hoc character device drivers doing mmap and getting the size limits wrong. In the process, it used "known good" limits for the normal cases of mapping regular files and block device drivers.
It turns out that the "s_maxbytes" limit was less "known good" than I thought. In particular, /proc doesn't set it, but exposes one regular file to mmap: /proc/vmcore. As a result, that file got limited to the default MAX_INT s_maxbytes value.
This went unnoticed for a while, because apparently the only thing that needs it is the s390 kernel zfcpdump, but there might be other tools that use this too.
Vasily suggested just changing s_maxbytes for all of /proc, which isn't wrong, but makes me nervous at this stage. So instead, just make the new mmap limit always be MAX_LFS_FILESIZE for regular files, which won't affect anything else. It wasn't the regular file case I was worried about.
I'd really prefer for maxsize to have been per-inode, but that is not how things are today.
Fixes: be83bbf80682 ("mmap: introduce sane default mmap limits") Reported-by: Vasily Gorbik gor@linux.ibm.com Cc: Al Viro viro@zeniv.linux.org.uk Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- mm/mmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/mmap.c +++ b/mm/mmap.c @@ -1318,7 +1318,7 @@ static inline int mlock_future_check(str static inline u64 file_mmap_size_max(struct file *file, struct inode *inode) { if (S_ISREG(inode->i_mode)) - return inode->i_sb->s_maxbytes; + return MAX_LFS_FILESIZE;
if (S_ISBLK(inode->i_mode)) return MAX_LFS_FILESIZE;