Will Deacon 61a1f0ad45 mm: proc: Invalidate TLB after clearing soft-dirty page state ... [ Upstream commit 912efa17e5121693dfbadae29768f4144a3f9e62 ] Since commit 0758cd8304 ("asm-generic/tlb: avoid potential double flush"), TLB invalidation is elided in tlb_finish_mmu() if no entries were batched via the tlb_remove_*() functions. Consequently, the page-table modifications performed by clear_refs_write() in response to a write to /proc/<pid>/clear_refs do not perform TLB invalidation. Although this is fine when simply aging the ptes, in the case of clearing the "soft-dirty" state we can end up with entries where pte_write() is false, yet a writable mapping remains in the TLB. Fix this by avoiding the mmu_gather API altogether: managing both the 'tlb_flush_pending' flag on the 'mm_struct' and explicit TLB invalidation for the sort-dirty path, much like mprotect() does already. Fixes: 0758cd8304 ("asm-generic/tlb: avoid potential double flush”) Signed-off-by: Will Deacon <will@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Yu Zhao <yuzhao@google.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lkml.kernel.org/r/20210127235347.1402-2-will@kernel.org Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-03-04 11:37:45 +01:00
..
array.c	seccomp: Report number of loaded filters in /proc/$pid/status	2020-07-10 16:01:51 -07:00
base.c	exec: Transform exec_update_mutex into a rw_semaphore	2021-01-09 13:46:24 +01:00
bootconfig.c
cmdline.c
consoles.c
cpuinfo.c	proc/cpuinfo: switch to ->read_iter	2020-11-06 10:05:18 -08:00
devices.c
fd.c
fd.h
generic.c	proc: fix lookup in /proc/net subdirectories after setns(2)	2020-12-30 11:53:56 +01:00
inode.c	proc: wire up generic_file_splice_read for iter ops	2020-11-06 10:05:18 -08:00
internal.h	proc: fix lookup in /proc/net subdirectories after setns(2)	2020-12-30 11:53:56 +01:00
interrupts.c
Kconfig
kcore.c
kmsg.c
loadavg.c
Makefile
meminfo.c	proc/meminfo: avoid open coded reading of vm_committed_as	2020-08-07 11:33:26 -07:00
namespaces.c
nommu.c
page.c	mm: Add PG_arch_2 page flag	2020-09-04 12:46:06 +01:00
proc_net.c	proc: fix lookup in /proc/net subdirectories after setns(2)	2020-12-30 11:53:56 +01:00
proc_sysctl.c	proc_sysctl: fix oops caused by incorrect command parameters	2021-01-27 11:55:14 +01:00
proc_tty.c
root.c
self.c	proc: don't allow async path resolution of /proc/self components	2020-11-13 16:47:52 -07:00
softirqs.c
stat.c	proc/stat: switch to ->read_iter	2020-11-06 10:05:18 -08:00
task_mmu.c	mm: proc: Invalidate TLB after clearing soft-dirty page state	2021-03-04 11:37:45 +01:00
task_nommu.c
thread_self.c
uptime.c
util.c
version.c
vmcore.c