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Description: mm: Avoid creating virtual address aliases in brk()/mmap()/mremap()
References:
https://bugzilla.redhat.com/show_bug.cgi?id=1797052
https://www.openwall.com/lists/oss-security/2020/02/25/6
Notes:
carnil> Introduced in ce18d171cb73 ("mm: untag user pointers in
carnil> mmap/munmap/mremap/brk") in 5.4-rc1.
Bugs:
upstream: released (5.6-rc3) [dcde237319e626d1ec3c9d8b7613032f0fd4663a]
4.19-upstream-stable: N/A "Vulnerable code not present"
4.9-upstream-stable: N/A "Vulnerable code not present"
3.16-upstream-stable: N/A "Vulnerable code not present"
sid: pending (5.5.13-1)
4.19-buster-security: N/A "Vulnerable code not present"
4.9-stretch-security: N/A "Vulnerable code not present"
3.16-jessie-security: N/A "Vulnerable code not present"
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