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authorChristoph Hellwig <hch@lst.de>2020-09-03 16:22:34 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2020-09-08 22:21:32 -0400
commit36e2c7421f02a22f71c9283e55fdb672a9eb58e7 (patch)
tree43b45747ad654e093c8d4a7dd9a90456590c2321 /arch/Kconfig
parent4d03e3cc59828c82ee89ea6e27a2f3cdf95aaadf (diff)
fs: don't allow splice read/write without explicit ops
default_file_splice_write is the last piece of generic code that uses set_fs to make the uaccess routines operate on kernel pointers. It implements a "fallback loop" for splicing from files that do not actually provide a proper splice_read method. The usual file systems and other high bandwidth instances all provide a ->splice_read, so this just removes support for various device drivers and procfs/debugfs files. If splice support for any of those turns out to be important it can be added back by switching them to the iter ops and using generic_file_splice_read. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/Kconfig')
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