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| author | Kees Cook <[email protected]> | 2017-12-01 21:19:39 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2017-12-18 14:59:17 +0000 |
| commit | 22ec1a2aea73b9dfe340dff7945bd85af4cc6280 (patch) | |
| tree | 92c1a38f121417e5702fe1f41ef99ea1004273ae /drivers/android/binder_alloc.h | |
| parent | fpga: socfpga-a10: disable clk on error in socfpga_a10_fpga_probe() (diff) | |
| download | kernel-22ec1a2aea73b9dfe340dff7945bd85af4cc6280.tar.gz kernel-22ec1a2aea73b9dfe340dff7945bd85af4cc6280.zip | |
/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 <[email protected]>
Fixes: f5509cc18daa ("mm: Hardened usercopy")
Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Diffstat (limited to 'drivers/android/binder_alloc.h')
0 files changed, 0 insertions, 0 deletions