diff options
| author | Eric Chan <ericchancf@google.com> | 2023-05-31 12:09:09 +0300 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2023-06-06 19:35:52 +0300 |
| commit | ab1e29acdb33c971e1af8ed8ec427bd1deff5f32 (patch) | |
| tree | 381ccec6cf78fd5b92b7cf27dfd637566c59cdff /arch/arm64/kernel/entry-common.c | |
| parent | 56b77ba112d48becc3e41c9fe2b1533ba220b7c3 (diff) | |
| download | linux-ab1e29acdb33c971e1af8ed8ec427bd1deff5f32.tar.xz | |
arm64: lockdep: enable checks for held locks when returning to userspace
Currently arm64 doesn't use CONFIG_GENERIC_ENTRY and doesn't call
lockdep_sys_exit() when returning to userspace.
This means that lockdep won't check for held locks when
returning to userspace, which would be useful to detect kernel bugs.
Call lockdep_sys_exit() when returning to userspace,
enabling checking for held locks.
At the same time, rename arm64's prepare_exit_to_user_mode() to
exit_to_user_mode_prepare() to more clearly align with the naming
in the generic entry code.
Signed-off-by: Eric Chan <ericchancf@google.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20230531090909.357047-1-ericchancf@google.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/kernel/entry-common.c')
| -rw-r--r-- | arch/arm64/kernel/entry-common.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c index 3af3c01c93a6..9d6827201b6c 100644 --- a/arch/arm64/kernel/entry-common.c +++ b/arch/arm64/kernel/entry-common.c @@ -126,7 +126,7 @@ static __always_inline void __exit_to_user_mode(void) lockdep_hardirqs_on(CALLER_ADDR0); } -static __always_inline void prepare_exit_to_user_mode(struct pt_regs *regs) +static __always_inline void exit_to_user_mode_prepare(struct pt_regs *regs) { unsigned long flags; @@ -135,11 +135,13 @@ static __always_inline void prepare_exit_to_user_mode(struct pt_regs *regs) flags = read_thread_flags(); if (unlikely(flags & _TIF_WORK_MASK)) do_notify_resume(regs, flags); + + lockdep_sys_exit(); } static __always_inline void exit_to_user_mode(struct pt_regs *regs) { - prepare_exit_to_user_mode(regs); + exit_to_user_mode_prepare(regs); mte_check_tfsr_exit(); __exit_to_user_mode(); } |