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author | Kees Cook <keescook@chromium.org> | 2017-12-02 00:19:39 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-12-18 17:59:17 +0300 |
commit | 22ec1a2aea73b9dfe340dff7945bd85af4cc6280 (patch) | |
tree | 92c1a38f121417e5702fe1f41ef99ea1004273ae /scripts/Lindent | |
parent | d9cc5a0edb705ced4ce91b4c6ee73ec6f5bfa49a (diff) | |
download | linux-22ec1a2aea73b9dfe340dff7945bd85af4cc6280.tar.xz |
/dev/mem: Add bounce buffer for copy-out
As done for /proc/kcore in
commit df04abfd181a ("fs/proc/kcore.c: Add bounce buffer for ktext data")
this adds a bounce buffer when reading memory via /dev/mem. This
is needed to allow kernel text memory to be read out when built with
CONFIG_HARDENED_USERCOPY (which refuses to read out kernel text) and
without CONFIG_STRICT_DEVMEM (which would have refused to read any RAM
contents at all).
Since this build configuration isn't common (most systems with
CONFIG_HARDENED_USERCOPY also have CONFIG_STRICT_DEVMEM), this also tries
to inform Kconfig about the recommended settings.
This patch is modified from Brad Spengler/PaX Team's changes to /dev/mem
code in the last public patch of grsecurity/PaX based on my understanding
of the code. Changes or omissions from the original code are mine and
don't reflect the original grsecurity/PaX code.
Reported-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Fixes: f5509cc18daa ("mm: Hardened usercopy")
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'scripts/Lindent')
0 files changed, 0 insertions, 0 deletions