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| author | Stuart MENEFY <stuart.menefy@st.com> | 2008-10-10 19:49:30 +0100 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2008-11-13 17:40:30 +0900 |
| commit | 5d52013cbb3d39bde9f5a6023193058eeb112e98 (patch) | |
| tree | e941d9e884132d72c002536955014a938d740906 /arch/sh/kernel/early_printk.c | |
| parent | 2cd0ebc83d771220eeddec91fd6d4cfefc2cc46e (diff) | |
| download | blackbird-op-linux-5d52013cbb3d39bde9f5a6023193058eeb112e98.tar.gz blackbird-op-linux-5d52013cbb3d39bde9f5a6023193058eeb112e98.zip | |
sh: __copy_user function can corrupt the stack in case of exception
The __copy_user function can corrupt the stack in the case of a
non-trivial length of data, and either of the first two move instructions
cause an exception. This is because the fixup for these two instructions
is mapped to the no_pop case, but these instructions execute after the
stack is pushed.
This change creates an explicit NO_POP exception mapping macro, and uses
it for the two instructions executed in the trivial case where no stack
pushes occur.
More information at ST Linux bugzilla:
https://bugzilla.stlinux.com/show_bug.cgi?id=4824
Signed-off-by: Dylan Reid <dylan_reid@bose.com>
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel/early_printk.c')
0 files changed, 0 insertions, 0 deletions
