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LIN5-23850 : Security Advisory - linux - CVE-2017-1000253

Created: Oct 16, 2017    Updated: May 29, 2018
Resolved Date: Oct 27, 2017
Found In Version: 5.0.1.41
Fix Version: 5.0.1.42
Severity: Standard
Applicable for: Wind River Linux 5
Component/s: Kernel

Description

Linux distributions that have not patched their long-term kernels with https://git.kernel.org/linus/a87938b2e246b81b4fb713edb371a9fa3c5c3c86 (committed on April 14, 2015). This kernel vulnerability was fixed in April 2015 by commit a87938b2e246b81b4fb713edb371a9fa3c5c3c86 (backported to Linux 3.10.77 in May 2015), but it was not recognized as a security threat. With CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE enabled, and a normal top-down address allocation strategy, load_elf_binary() will attempt to map a PIE binary into an address range immediately below mm->mmap_base. Unfortunately, load_elf_ binary() does not take account of the need to allocate sufficient space for the entire binary which means that, while the first PT_LOAD segment is mapped below mm->mmap_base, the subsequent PT_LOAD segment(s) end up being mapped above mm->mmap_base into the are that is supposed to be the gap between the stack and the binary.

https://nvd.nist.gov/vuln/detail/CVE-2017-1000253

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