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| author | Michael Schmitz <schmitzmic@gmail.com> | 2017-04-30 19:49:21 +1200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2017-05-24 17:41:26 -0400 |
| commit | 9dfa7bba35ac08a63565d58c454dccb7e1bb0a08 (patch) | |
| tree | dc3c409bbdc76c8eef5da5e7c37eb311c76bc92d /.cocciconfig | |
| parent | 08332893e37af6ae779367e78e444f8f9571511d (diff) | |
| download | linux-9dfa7bba35ac08a63565d58c454dccb7e1bb0a08.tar.gz linux-9dfa7bba35ac08a63565d58c454dccb7e1bb0a08.tar.bz2 linux-9dfa7bba35ac08a63565d58c454dccb7e1bb0a08.zip | |
fix race in drivers/char/random.c:get_reg()
get_reg() can be reentered on architectures with prioritized interrupts
(m68k in this case), causing f->reg_index to be incremented after the
range check. Out of bounds memory access past the pt_regs struct results.
This will go mostly undetected unless access is beyond end of memory.
Prevent the race by disabling interrupts in get_reg().
Tested on m68k (Atari Falcon, and ARAnyM emulator).
Kudos to Geert Uytterhoeven for helping to trace this race.
Signed-off-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to '.cocciconfig')
0 files changed, 0 insertions, 0 deletions