From 836b2fe544a5e9b5ce116622cb36fba33838c6fd Mon Sep 17 00:00:00 2001 From: Eduard Zingerman Date: Fri, 4 Sep 2026 01:33:23 -0700 Subject: selftests/bpf: Check that JMP32 pointer vs zero jumps are not predicted Add jmp32_ptr_vs_zero_jne: the fall-through of the 32-bit compare, which the verifier used to skip, contains an out of bounds map value access, hence w/o the previous patch the program is accepted. See previous patch for detailed description. Reported-by: Nicholas Carlini Suggested-by: Nicholas Carlini Signed-off-by: Eduard Zingerman Link: https://lore.kernel.org/bpf/20260904083325.2083493-6-eddyz87@gmail.com Signed-off-by: Kumar Kartikeya Dwivedi --- drivers/accessibility/speakup/thread.c | 62 ++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 drivers/accessibility/speakup/thread.c (limited to 'drivers/accessibility/speakup/thread.c') diff --git a/drivers/accessibility/speakup/thread.c b/drivers/accessibility/speakup/thread.c new file mode 100644 index 000000000..2fc75e60f --- /dev/null +++ b/drivers/accessibility/speakup/thread.c @@ -0,0 +1,62 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include + +#include "spk_types.h" +#include "speakup.h" +#include "spk_priv.h" + +DECLARE_WAIT_QUEUE_HEAD(speakup_event); +EXPORT_SYMBOL_GPL(speakup_event); + +int speakup_thread(void *data) +{ + unsigned long flags; + int should_break; + struct bleep our_sound; + + our_sound.active = 0; + our_sound.freq = 0; + our_sound.jiffies = 0; + + mutex_lock(&spk_mutex); + while (1) { + DEFINE_WAIT(wait); + + while (1) { + spin_lock_irqsave(&speakup_info.spinlock, flags); + our_sound = spk_unprocessed_sound; + spk_unprocessed_sound.active = 0; + prepare_to_wait(&speakup_event, &wait, + TASK_INTERRUPTIBLE); + should_break = kthread_should_stop() || + our_sound.active || + (synth && synth->catch_up && synth->alive && + (speakup_info.flushing || + !synth_buffer_empty())); + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + if (should_break) + break; + mutex_unlock(&spk_mutex); + schedule(); + mutex_lock(&spk_mutex); + } + finish_wait(&speakup_event, &wait); + if (kthread_should_stop()) + break; + + if (our_sound.active) + kd_mksound(our_sound.freq, our_sound.jiffies); + if (synth && synth->catch_up && synth->alive) { + /* + * It is up to the callee to take the lock, so that it + * can sleep whenever it likes + */ + synth->catch_up(synth); + } + + speakup_start_ttys(); + } + mutex_unlock(&spk_mutex); + return 0; +} -- cgit v1.3.1