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If the kernel is configured with KASAN_EXTRA, the stack size is increased significantly due to setting the GCC -fstack-reuse option to "none" [1]. As a result, it can trigger a stack overrun quite often with 32k stack size compiled using GCC 8. For example, this reproducer https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/syscalls/madvise/madvise06.c can trigger a "corrupted stack end detected inside scheduler" very reliably with CONFIG_SCHED_STACK_END_CHECK enabled. There are other reports at: https://lore.kernel.org/lkml/1542144497.12945.29.camel@gmx.us/ https://lore.kernel.org/lkml/721E7B42-2D55-4866-9C1A-3E8D64F33F9C@gmx.us/ There are just too many functions that could have a large stack with KASAN_EXTRA due to large local variables that have been called over and over again without being able to reuse the stacks. Some noticiable ones are, size 7536 shrink_inactive_list 7440 shrink_page_list 6560 fscache_stats_show 3920 jbd2_journal_commit_transaction 3216 try_to_unmap_one 3072 migrate_page_move_mapping 3584 migrate_misplaced_transhuge_page 3920 ip_vs_lblcr_schedule 4304 lpfc_nvme_info_show 3888 lpfc_debugfs_nvmestat_data.constprop There are other 49 functions over 2k in size while compiling kernel with "-Wframe-larger-than=" on this machine. Hence, it is too much work to change Makefiles for each object to compile without -fsanitize-address-use-after-scope individually. [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81715#c23 Signed-off-by: Qian Cai <cai@lca.pw> Signed-off-by: Will Deacon <will.deacon@arm.com> |
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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.