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linux/arch/um
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Linus Torvalds e6bbad7571 mm: always expand the stack with the mmap write lock held 
commit 8d7071af89 upstream

This finishes the job of always holding the mmap write lock when
extending the user stack vma, and removes the 'write_locked' argument
from the vm helper functions again.

For some cases, we just avoid expanding the stack at all: drivers and
page pinning really shouldn't be extending any stacks.  Let's see if any
strange users really wanted that.

It's worth noting that architectures that weren't converted to the new
lock_mm_and_find_vma() helper function are left using the legacy
"expand_stack()" function, but it has been changed to drop the mmap_lock
and take it for writing while expanding the vma.  This makes it fairly
straightforward to convert the remaining architectures.

As a result of dropping and re-taking the lock, the calling conventions
for this function have also changed, since the old vma may no longer be
valid.  So it will now return the new vma if successful, and NULL - and
the lock dropped - if the area could not be extended.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[6.1: Patch drivers/iommu/io-pgfault.c instead]
Signed-off-by: Samuel Mendoza-Jonas <samjonas@amazon.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2023-07-01 13:16:25 +02:00
..
configs treewide: defconfig: address renamed CONFIG_DEBUG_INFO=y 2022-09-11 21:55:05 -07:00
drivers um: harddog: fix modular build 2023-06-09 10:34:10 +02:00
include kernel: exit: cleanup release_thread() 2022-09-11 21:55:07 -07:00
kernel mm: always expand the stack with the mmap write lock held 2023-07-01 13:16:25 +02:00
os-Linux um: Enable FORTIFY_SOURCE 2022-09-07 16:37:27 -07:00
scripts License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
.gitignore um: gitignore: Add kernel/capflags.c 2021-12-21 21:22:43 +01:00
Kbuild kbuild: require all architectures to have arch/$(SRCARCH)/Kbuild 2021-05-26 23:10:37 +09:00
Kconfig um: Enable FORTIFY_SOURCE 2022-09-07 16:37:27 -07:00
Kconfig.debug um: Disable CONFIG_GCOV with MODULES 2021-04-15 23:10:33 +02:00
Makefile arch: um: Mark the stack non-executable to fix a binutils warning 2022-09-21 09:11:42 +02:00
Makefile-os-Linux x86, um: get rid of arch/um/os symlink 2008-10-22 22:55:22 -07:00
Makefile-skas [PATCH] uml makefiles sanitized 2005-09-29 08:46:26 -07:00