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Message-ID: <20230128063229.989058-1-mawupeng1@huawei.com> Date: Sat, 28 Jan 2023 14:32:25 +0800 From: Wupeng Ma <mawupeng1@...wei.com> To: <akpm@...ux-foundation.org> CC: <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>, <mawupeng1@...wei.com>, <kuleshovmail@...il.com>, <aneesh.kumar@...ux.ibm.com> Subject: [PATCH v3 0/4] Add overflow checks for several syscalls From: Ma Wupeng <mawupeng1@...wei.com> While testing mlock, we have a problem if the len of mlock is ULONG_MAX. The return value of mlock is zero. But nothing will be locked since the len in do_mlock overflows to zero due to the following code in mlock: len = PAGE_ALIGN(len + (offset_in_page(start))); The same problem happens in munlock. Add new check and return -EINVAL to fix this overflowing scenarios since they are absolutely wrong. Similar logic is used to fix problems with multiple syscalls. Changelog since v2[2]: - modified the way of checking overflows based on Andrew's comments Changelog since v1[1]: - only check overflow rather than access_ok to keep backward-compatibility [1]: https://lore.kernel.org/lkml/20221228141701.c64add46c4b09aa17f605baf@linux-foundation.org/T/ [2]: https://lore.kernel.org/linux-mm/20230116115813.2956935-5-mawupeng1@huawei.com/T/ Ma Wupeng (4): mm/mlock: return EINVAL if len overflows for mlock/munlock mm/mempolicy: return EINVAL for if len overflows for set_mempolicy_home_node mm/mempolicy: return EINVAL if len overflows for mbind mm/msync: return ENOMEM if len overflows for msync mm/mempolicy.c | 18 ++++++++++++------ mm/mlock.c | 14 ++++++++++++-- mm/msync.c | 9 ++++++--- 3 files changed, 30 insertions(+), 11 deletions(-) -- 2.25.1
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