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Jann Horn 8eb52a1ee3 binder: Fix race between mmap() and binder_alloc_print_pages()
binder_alloc_print_pages() iterates over
alloc->pages[0..alloc->buffer_size-1] under alloc->mutex.
binder_alloc_mmap_handler() writes alloc->pages and alloc->buffer_size
without holding that lock, and even writes them before the last bailout
point.

Unfortunately we can't take the alloc->mutex in the ->mmap() handler
because mmap_sem can be taken while alloc->mutex is held.
So instead, we have to locklessly check whether the binder_alloc has been
fully initialized with binder_alloc_get_vma(), like in
binder_alloc_new_buf_locked().

Fixes: 8ef4665aa1 ("android: binder: Add page usage in binder stats")
Cc: stable@vger.kernel.org
Signed-off-by: Jann Horn <jannh@google.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Link: https://lore.kernel.org/r/20191018205631.248274-1-jannh@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-14 11:44:46 +08:00
arch ARM: SoC fixes 2019-11-10 13:41:59 -08:00
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Documentation Merge 5.4-rc7 into char-misc-next 2019-11-11 06:24:30 +01:00
drivers binder: Fix race between mmap() and binder_alloc_print_pages() 2019-11-14 11:44:46 +08:00
fs configfs regression fix for 5.4-rc 2019-11-10 12:59:34 -08:00
include parport: daisy: avoid hardcoded name 2019-11-13 19:09:47 +08:00
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net Merge 5.4-rc7 into char-misc-next 2019-11-11 06:24:30 +01:00
samples Merge 5.4-rc7 into char-misc-next 2019-11-11 06:24:30 +01:00
scripts
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.mailmap ARM: SoC fixes 2019-11-10 13:41:59 -08:00
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MAINTAINERS ARM: SoC fixes 2019-11-10 13:41:59 -08:00
Makefile Linux 5.4-rc7 2019-11-10 16:17:15 -08:00
README

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 Restructured Text 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.