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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2020-01-31 11:34:54 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-02-19 22:46:08 +1100 |
| commit | 9e27086292aa880921a0f2b8501e5189d5efcf03 (patch) | |
| tree | 79b9c6c21074e5da094dce9cf912ad3b7bd313b3 /kernel | |
| parent | 030e347430957f6f7f29db9099368f8b86c0bf76 (diff) | |
| download | linux-9e27086292aa880921a0f2b8501e5189d5efcf03.tar.bz2 | |
powerpc/32: Warn and return ENOSYS on syscalls from kernel
Since commit b86fb88855ea ("powerpc/32: implement fast entry for
syscalls on non BOOKE") and commit 1a4b739bbb4f ("powerpc/32:
implement fast entry for syscalls on BOOKE"), syscalls from
kernel are unexpected and can have catastrophic consequences
as it will destroy the kernel stack.
Test MSR_PR on syscall entry. In case syscall is from kernel,
emit a warning and return ENOSYS error.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/8ee3bdbbdfdfc64ca7001e90c43b2aee6f333578.1580470482.git.christophe.leroy@c-s.fr
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions