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| author | Aaro Koskinen <[email protected]> | 2014-07-22 11:51:08 +0000 |
|---|---|---|
| committer | Ralf Baechle <[email protected]> | 2014-08-19 16:24:42 +0000 |
| commit | 608308682addfdc7b8e2aee88f0e028331d88e4d (patch) | |
| tree | dbf68401067b7d6582d55705afb23ab374c57329 /lib/assoc_array.c | |
| parent | MIPS: CPS: Initialize EVA before bringing up VPEs from secondary cores (diff) | |
| download | kernel-608308682addfdc7b8e2aee88f0e028331d88e4d.tar.gz kernel-608308682addfdc7b8e2aee88f0e028331d88e4d.zip | |
MIPS: OCTEON: make get_system_type() thread-safe
get_system_type() is not thread-safe on OCTEON. It uses static data,
also more dangerous issue is that it's calling cvmx_fuse_read_byte()
every time without any synchronization. Currently it's possible to get
processes stuck looping forever in kernel simply by launching multiple
readers of /proc/cpuinfo:
(while true; do cat /proc/cpuinfo > /dev/null; done) &
(while true; do cat /proc/cpuinfo > /dev/null; done) &
...
Fix by initializing the system type string only once during the early
boot.
Signed-off-by: Aaro Koskinen <[email protected]>
Cc: [email protected]
Reviewed-by: Markos Chandras <[email protected]>
Patchwork: http://patchwork.linux-mips.org/patch/7437/
Signed-off-by: James Hogan <[email protected]>
Diffstat (limited to 'lib/assoc_array.c')
0 files changed, 0 insertions, 0 deletions