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Alice has reported the following UBSAN splat: UBSAN: Undefined behaviour in mm/memcontrol.c:661:17 signed integer overflow: -2147483644 - 2147483525 cannot be represented in type 'long int' CPU: 1 PID: 11758 Comm: mybibtex2filena Tainted: P O 4.9.25-gentoo #4 Hardware name: XXXXXX, BIOS YYYYYY Call Trace: dump_stack+0x59/0x87 ubsan_epilogue+0xe/0x40 handle_overflow+0xbb/0xf0 __ubsan_handle_sub_overflow+0x12/0x20 memcg_check_events.isra.36+0x223/0x360 mem_cgroup_commit_charge+0x55/0x140 wp_page_copy+0x34e/0xb80 do_wp_page+0x1e6/0x1300 handle_mm_fault+0x88b/0x1990 __do_page_fault+0x2de/0x8a0 do_page_fault+0x1a/0x20 error_code+0x67/0x6c The reason is that we subtract two signed types. Let's fix this by truly mimicing time_after and cast the result of the subtraction. Link: http://lkml.kernel.org/r/20170616150057.GQ30580@dhcp22.suse.cz Signed-off-by: Michal Hocko <mhocko@suse.com> Reported-by: Alice Ferrazzi <alicef@gentoo.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.