Re: [PATCH RFC v3 30/35] arm64: mte: ptrace: Handle pages with missing tag storage

2024-02-01 Thread Alexandru Elisei
Hi, On Thu, Feb 01, 2024 at 02:51:39PM +0530, Anshuman Khandual wrote: > > > On 1/25/24 22:12, Alexandru Elisei wrote: > > A page can end up mapped in a MTE enabled VMA without the corresponding tag > > storage block reserved. Tag accesses made by ptrace in this case can lead > > to the wrong ta

Re: [PATCH RFC v3 30/35] arm64: mte: ptrace: Handle pages with missing tag storage

2024-02-01 Thread Anshuman Khandual
On 1/25/24 22:12, Alexandru Elisei wrote: > A page can end up mapped in a MTE enabled VMA without the corresponding tag > storage block reserved. Tag accesses made by ptrace in this case can lead > to the wrong tags being read or memory corruption for the process that is > using the tag storage

[PATCH RFC v3 30/35] arm64: mte: ptrace: Handle pages with missing tag storage

2024-01-25 Thread Alexandru Elisei
A page can end up mapped in a MTE enabled VMA without the corresponding tag storage block reserved. Tag accesses made by ptrace in this case can lead to the wrong tags being read or memory corruption for the process that is using the tag storage memory as data. Reserve tag storage by treating ptra