Peter Xu d28f319043 mm/smaps: don't access young/dirty bit if pte unpresent ... [ Upstream commit efd4149342 ] These bits should only be valid when the ptes are present. Introducing two booleans for it and set it to false when !pte_present() for both pte and pmd accountings. The bug is found during code reading and no real world issue reported, but logically such an error can cause incorrect readings for either smaps or smaps_rollup output on quite a few fields. For example, it could cause over-estimate on values like Shared_Dirty, Private_Dirty, Referenced. Or it could also cause under-estimate on values like LazyFree, Shared_Clean, Private_Clean. Link: https://lkml.kernel.org/r/20220805160003.58929-1-peterx@redhat.com Fixes: b1d4d9e0cb ("proc/smaps: carefully handle migration entries") Fixes: c94b6923fa ("/proc/PID/smaps: Add PMD migration entry parsing") Signed-off-by: Peter Xu <peterx@redhat.com> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Yang Shi <shy828301@gmail.com> Cc: Konstantin Khlebnikov <khlebnikov@openvz.org> Cc: Huang Ying <ying.huang@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-08-31 17:16:37 +02:00
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Kconfig	…
Makefile	…
array.c	…
base.c	proc: fix a dentry lock race between release_task and lookup	2022-08-17 14:24:08 +02:00
bootconfig.c	proc: bootconfig: Add null pointer check	2022-04-08 14:24:12 +02:00
cmdline.c	…
consoles.c	…
cpuinfo.c	…
devices.c	…
fd.c	procfs: prevent unprivileged processes accessing fdinfo dir	2022-05-18 10:26:50 +02:00
fd.h	…
generic.c	proc: fix dentry/inode overinstantiating under /proc/${pid}/net	2022-06-09 10:23:10 +02:00
inode.c	…
internal.h	…
interrupts.c	…
kcore.c	…
kmsg.c	…
loadavg.c	…
meminfo.c	…
namespaces.c	…
nommu.c	…
page.c	…
proc_net.c	proc: fix dentry/inode overinstantiating under /proc/${pid}/net	2022-06-09 10:23:10 +02:00
proc_sysctl.c	sysctl: move some boundary constants from sysctl.c to sysctl_vals	2022-07-29 17:25:11 +02:00
proc_tty.c	…
root.c	…
self.c	…
softirqs.c	…
stat.c	…
task_mmu.c	mm/smaps: don't access young/dirty bit if pte unpresent	2022-08-31 17:16:37 +02:00
task_nommu.c	…
thread_self.c	…
uptime.c	…
util.c	…
version.c	…
vmcore.c	proc/vmcore: fix clearing user buffer by properly using clear_user()	2021-12-01 09:04:44 +01:00