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faf3c92352
If we get a signal, we need to restore the vm_refcnt. We don't think that the refcount can actually be decremented to zero here as it requires the VMA to be detached, and the vma_mark_detached() uses TASK_UNINTERRUPTIBLE. However, that's a bit subtle, so handle it as if the refcount was zero at the start of this function. Link: https://lkml.kernel.org/r/20251128040100.3022561-1-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reported-by: syzbot+5b19bad23ac7f44bf8b8@syzkaller.appspotmail.com Fixes: 2197bb60f890 ("mm: add vma_start_write_killable()") Reviewed-by: Suren Baghdasaryan <surenb@google.com> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.