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| author | Sami Tolvanen <samitolvanen@google.com> | 2022-05-31 19:59:10 +0200 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2022-06-13 18:18:46 +0200 |
| commit | 57cd6d157eb479f0a8e820fd36b7240845c8a937 (patch) | |
| tree | e19640e7508fe88f5ce7011fefa58a5d91025b6b /mm/usercopy.c | |
| parent | Linux 5.19-rc2 (diff) | |
| download | linux-57cd6d157eb479f0a8e820fd36b7240845c8a937.tar.xz linux-57cd6d157eb479f0a8e820fd36b7240845c8a937.zip | |
cfi: Fix __cfi_slowpath_diag RCU usage with cpuidle
RCU_NONIDLE usage during __cfi_slowpath_diag can result in an invalid
RCU state in the cpuidle code path:
WARNING: CPU: 1 PID: 0 at kernel/rcu/tree.c:613 rcu_eqs_enter+0xe4/0x138
...
Call trace:
rcu_eqs_enter+0xe4/0x138
rcu_idle_enter+0xa8/0x100
cpuidle_enter_state+0x154/0x3a8
cpuidle_enter+0x3c/0x58
do_idle.llvm.6590768638138871020+0x1f4/0x2ec
cpu_startup_entry+0x28/0x2c
secondary_start_kernel+0x1b8/0x220
__secondary_switched+0x94/0x98
Instead, call rcu_irq_enter/exit to wake up RCU only when needed and
disable interrupts for the entire CFI shadow/module check when we do.
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Link: https://lore.kernel.org/r/20220531175910.890307-1-samitolvanen@google.com
Fixes: cf68fffb66d6 ("add support for Clang CFI")
Cc: stable@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'mm/usercopy.c')
0 files changed, 0 insertions, 0 deletions