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Linux kernel source tree
a8c15954d6
If we make sure we grab a strong reference to each object as we dump it, we can reduce the locks outside of our iterators to an rcu_read_lock. This should prevent errors like: [ 2138.371911] BUG: KASAN: use-after-free in per_file_stats+0x43/0x380 [i915] [ 2138.371924] Read of size 8 at addr ffff888223651000 by task cat/8293 [ 2138.371947] CPU: 0 PID: 8293 Comm: cat Not tainted 5.3.0-rc6-CI-Custom_4352+ #1 [ 2138.371953] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./J4205-ITX, BIOS P1.40 07/14/2017 [ 2138.371959] Call Trace: [ 2138.371974] dump_stack+0x7c/0xbb [ 2138.372099] ? per_file_stats+0x43/0x380 [i915] [ 2138.372108] print_address_description+0x73/0x3a0 [ 2138.372231] ? per_file_stats+0x43/0x380 [i915] [ 2138.372352] ? per_file_stats+0x43/0x380 [i915] [ 2138.372362] __kasan_report+0x14e/0x192 [ 2138.372489] ? per_file_stats+0x43/0x380 [i915] [ 2138.372502] kasan_report+0xe/0x20 [ 2138.372625] per_file_stats+0x43/0x380 [i915] [ 2138.372751] ? i915_panel_show+0x110/0x110 [i915] [ 2138.372761] idr_for_each+0xa7/0x160 [ 2138.372773] ? idr_get_next_ul+0x110/0x110 [ 2138.372782] ? do_raw_spin_lock+0x10a/0x1d0 [ 2138.372923] print_context_stats+0x264/0x510 [i915] Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Tested-by: David Weinehall <david.weinehall@linux.intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190903062133.27360-1-chris@chris-wilson.co.uk |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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.