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| author | Greg Kurz <gkurz@linux.vnet.ibm.com> | 2014-10-31 07:50:11 +0100 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2014-11-06 23:10:22 +0800 |
| commit | 24c65bc7037e7d0f362c0df70d17dd72ee64b8b9 (patch) | |
| tree | a1194d334760f049164a46ceac026e5628f1a2b0 /tools/perf/scripts/python/syscall-counts-by-pid.py | |
| parent | 738459e3f88538f2ece263424dafe5d91799e46b (diff) | |
hwrng: pseries - port to new read API and fix stack corruption
The add_early_randomness() function in drivers/char/hw_random/core.c passes
a 16-byte buffer to pseries_rng_data_read(). Unfortunately, plpar_hcall()
returns four 64-bit values and trashes 16 bytes on the stack.
This bug has been lying around for a long time. It got unveiled by:
commit d3cc7996473a7bdd33256029988ea690754e4e2a
Author: Amit Shah <amit.shah@redhat.com>
Date: Thu Jul 10 15:42:34 2014 +0530
hwrng: fetch randomness only after device init
It may trig a oops while loading or unloading the pseries-rng module for both
PowerVM and PowerKVM guests.
This patch does two things:
- pass an intermediate well sized buffer to plpar_hcall(). This is acceptalbe
since we're not on a hot path.
- move to the new read API so that we know the return buffer size for sure.
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'tools/perf/scripts/python/syscall-counts-by-pid.py')
0 files changed, 0 insertions, 0 deletions