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authorNaoya Horiguchi <nao.horiguchi@gmail.com>2020-06-11 17:34:48 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-11 18:17:47 -0700
commit03151c6e0b66c63c3e9980edf78c3a7a99801764 (patch)
tree5a9de246dbf075ad962aef289ac59a14e3b3d9be
parent4e018b450ad34b0edc865e91ec5e957d677e2c4e (diff)
downloadlinux-03151c6e0b66c63c3e9980edf78c3a7a99801764.tar.bz2
mm/memory-failure: send SIGBUS(BUS_MCEERR_AR) only to current thread
Action Required memory error should happen only when a processor is about to access to a corrupted memory, so it's synchronous and only affects current process/thread. Recently commit 872e9a205c84 ("mm, memory_failure: don't send BUS_MCEERR_AO for action required error") fixed the issue that Action Required memory could unnecessarily send SIGBUS to the processes which share the error memory. But we still have another issue that we could send SIGBUS to a wrong thread. This is because collect_procs() and task_early_kill() fails to add the current process to "to-kill" list. So this patch is suggesting to fix it. With this fix, SIGBUS(BUS_MCEERR_AR) is never sent to non-current process/thread. Signed-off-by: Naoya Horiguchi <naoya.horiguchi@nec.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Tony Luck <tony.luck@intel.com> Acked-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com> Link: http://lkml.kernel.org/r/1591321039-22141-3-git-send-email-naoya.horiguchi@nec.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/memory-failure.c23
1 files changed, 16 insertions, 7 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 848de82cd547..47b8ccb1fb9b 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -212,15 +212,13 @@ static int kill_proc(struct to_kill *tk, unsigned long pfn, int flags)
short addr_lsb = tk->size_shift;
int ret = 0;
- if ((t->mm == current->mm) || !(flags & MF_ACTION_REQUIRED))
- pr_err("Memory failure: %#lx: Sending SIGBUS to %s:%d due to hardware memory corruption\n",
+ pr_err("Memory failure: %#lx: Sending SIGBUS to %s:%d due to hardware memory corruption\n",
pfn, t->comm, t->pid);
if (flags & MF_ACTION_REQUIRED) {
- if (t->mm == current->mm)
- ret = force_sig_mceerr(BUS_MCEERR_AR,
+ WARN_ON_ONCE(t != current);
+ ret = force_sig_mceerr(BUS_MCEERR_AR,
(void __user *)tk->addr, addr_lsb);
- /* send no signal to non-current processes */
} else {
/*
* Don't use force here, it's convenient if the signal
@@ -419,14 +417,25 @@ static struct task_struct *find_early_kill_thread(struct task_struct *tsk)
* to be signaled when some page under the process is hwpoisoned.
* Return task_struct of the dedicated thread (main thread unless explicitly
* specified) if the process is "early kill," and otherwise returns NULL.
+ *
+ * Note that the above is true for Action Optional case, but not for Action
+ * Required case where SIGBUS should sent only to the current thread.
*/
static struct task_struct *task_early_kill(struct task_struct *tsk,
int force_early)
{
if (!tsk->mm)
return NULL;
- if (force_early)
- return tsk;
+ if (force_early) {
+ /*
+ * Comparing ->mm here because current task might represent
+ * a subthread, while tsk always points to the main thread.
+ */
+ if (tsk->mm == current->mm)
+ return current;
+ else
+ return NULL;
+ }
return find_early_kill_thread(tsk);
}