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| author | Michael Neuling <mikey@neuling.org> | 2017-10-12 21:17:19 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-10-21 09:36:28 +1100 |
| commit | 92fb8690bd04cb421d987d246deac60eef85d272 (patch) | |
| tree | 22a6b0e98a096b34dd91adb60f505106a97078f5 /drivers/misc/cxl/cxl.h | |
| parent | 54820530c5faa9fd78e1c08cb6449100b1a19157 (diff) | |
| download | linux-92fb8690bd04cb421d987d246deac60eef85d272.tar.gz | |
powerpc/tm: P9 disable transactionally suspended sigcontexts
Unfortunately userspace can construct a sigcontext which enables suspend. Thus userspace can force Linux into a path where trechkpt is executed. This patch blocks this from happening on POWER9 by sanity checking sigcontexts passed in. ptrace doesn't have this problem as only MSR SE and BE can be changed via ptrace. This patch also adds a number of WARN_ON()s in case we ever enter suspend when we shouldn't. This should not happen, but if it does the symptoms are soft lockup warnings which are not obviously TM related, so the WARN_ON()s should make it obvious what's happening. Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Cyril Bur <cyrilbur@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/misc/cxl/cxl.h')
0 files changed, 0 insertions, 0 deletions