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For the init task's first execve, this >> causes a problem: >> >> 1. current->mm is NULL (kernel threads don't have an mm) >> 2. sched_mm_cid_before_execve() exits early because mm is NULL >> 3. exec_binprm() fails (e.g., ENOENT for missing script interpreter) >> 4. sched_mm_cid_after_execve() is called with mm still NULL >> 5. sched_mm_cid_fork() is called unconditionally, triggering WARN_ON >> >> This is easily reproduced by booting with an init that is a shell script >> (#!/bin/sh) where the interpreter doesn't exist in the initramfs. >> >> Fix this by checking if t->mm is NULL before calling sched_mm_cid_fork(), >> matching the behavior of sched_mm_cid_before_execve() which already >> handles this case via sched_mm_cid_exit()'s early return. >> >> Fixes: b0c3d51b54f8 ("sched/mmcid: Provide precomputed maximal value") >> Cc: Thomas Gleixner >> Signed-off-by: Cong Wang >> --- >> kernel/sched/core.c | 5 +++-- >> 1 file changed, 3 insertions(+), 2 deletions(-) >> >> diff --git a/kernel/sched/core.c b/kernel/sched/core.c >> index 41ba0be16911..60afadb6eede 100644 >> --- a/kernel/sched/core.c >> +++ b/kernel/sched/core.c >> @@ -10694,10 +10694,11 @@ void sched_mm_cid_before_execve(struct task_struct *t) >> sched_mm_cid_exit(t); >> } >> >> -/* Reactivate MM CID after successful execve() */ >> +/* Reactivate MM CID after execve() */ >> void sched_mm_cid_after_execve(struct task_struct *t) >> { >> - sched_mm_cid_fork(t); >> + if (t->mm) >> + sched_mm_cid_fork(t); >> } >> >> static void mm_cid_work_fn(struct work_struct *work) > > This addresses a panic reported on arm64 when trying to execute x86 > binaries using TCG on an Apple device: > > https://lore.kernel.org/all/20251226192506.88593-1-za4emsu@gmail.com/ > > so: > > Acked-by: Will Deacon > > Please can we land this for 6.19? Yes, please. I gave my Reviewed-by already 2 weeks ago: https://lore.kernel.org/lkml/d6ac8fe9-5fc0-4042-9592-cde3db82b65e@efficios.com/ I guess the relevant maintainers are gradually coming back from the holiday break. I will ask it again here: can we fast-track this fix for upstream ? Thanks, Mathieu > > Cheers, > > Will -- Mathieu Desnoyers EfficiOS Inc. https://www.efficios.com