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um: Re-evaluate thread flags repeatedly

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[ Upstream commit b9e2f2246e ]

The thread flags may change during their processing.
For example a task_work can queue a new signal to be sent.
This signal should be delivered before returning to usespace again.

Evaluate the flags repeatedly similar to other architectures.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Nam Cao <namcao@linutronix.de>
Link: https://patch.msgid.link/20250704-uml-thread_flags-v1-1-0e293fd8d627@linutronix.de
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Thomas Weißschuh 2025-07-04 14:34:47 +02:00 committed by Greg Kroah-Hartman
parent dae6099edf
commit 6cd174be92
2 changed files with 15 additions and 7 deletions
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4
arch/um/include/asm/thread_info.h
View File

@ -68,7 +68,11 @@ static inline struct thread_info *current_thread_info(void)
#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL)
#define _TIF_MEMDIE (1 << TIF_MEMDIE)
#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
#define _TIF_SECCOMP (1 << TIF_SECCOMP)
#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL | \
_TIF_NOTIFY_RESUME)
#endif

18
arch/um/kernel/process.c
View File

@ -98,14 +98,18 @@ void *__switch_to(struct task_struct *from, struct task_struct *to)
void interrupt_end(void)
{
struct pt_regs *regs = &current->thread.regs;
unsigned long thread_flags;
if (need_resched())
schedule();
if (test_thread_flag(TIF_SIGPENDING) ||
test_thread_flag(TIF_NOTIFY_SIGNAL))
do_signal(regs);
if (test_thread_flag(TIF_NOTIFY_RESUME))
resume_user_mode_work(regs);
thread_flags = read_thread_flags();
while (thread_flags & _TIF_WORK_MASK) {
if (thread_flags & _TIF_NEED_RESCHED)
schedule();
if (thread_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL))
do_signal(regs);
if (thread_flags & _TIF_NOTIFY_RESUME)
resume_user_mode_work(regs);
thread_flags = read_thread_flags();
}
}
int get_current_pid(void)