Messages in this thread | | | Date | Fri, 9 Sep 2022 21:06:11 +0100 | From | Matthew Wilcox <> | Subject | Re: [PATCH] mm/slub: fix to return errno if kmalloc() fails |
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On Thu, Sep 08, 2022 at 11:25:08PM +0200, Vlastimil Babka (SUSE) wrote: > > I tend to agree with you. A mount operation shouldn’t panic the > > kernel. > > Hmm kmalloc(64) shouldn't normally due that due to the the underlying page > allocation falling into the "too small to fail" category, wonder if > syzkaller was doing anything special here?
Here's the repro:
https://syzkaller.appspot.com/x/repro.c?x=17cd7fa3080000
you can see it does:
fd = open("/proc/thread-self/fail-nth", O_RDWR); if (fd == -1) exit(1); char buf[16]; sprintf(buf, "%d", nth); if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
so this is the kind of stupid nitpicky bug that we shouldn't be reporting, let alone fixing, IMO.
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