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Filename Latest commit message Latest commit date
Gerald Schaefer 09602177d8 s390/mm: do not trigger write fault when vma does not allow VM_WRITE 
commit 41ac42f137080bc230b5882e3c88c392ab7f2d32 upstream.

For non-protection pXd_none() page faults in do_dat_exception(), we
call do_exception() with access == (VM_READ | VM_WRITE | VM_EXEC).
In do_exception(), vma->vm_flags is checked against that before
calling handle_mm_fault().

Since commit 92f842eac7 ("[S390] store indication fault optimization"),
we call handle_mm_fault() with FAULT_FLAG_WRITE, when recognizing that
it was a write access. However, the vma flags check is still only
checking against (VM_READ | VM_WRITE | VM_EXEC), and therefore also
calling handle_mm_fault() with FAULT_FLAG_WRITE in cases where the vma
does not allow VM_WRITE.

Fix this by changing access check in do_exception() to VM_WRITE only,
when recognizing write access.

Link: https://lkml.kernel.org/r/20220811103435.188481-3-david@redhat.com
Fixes: 92f842eac7 ("[S390] store indication fault optimization")
Cc: <stable@vger.kernel.org>
Reported-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-09-05 10:27:44 +02:00
arch s390/mm: do not trigger write fault when vma does not allow VM_WRITE 2022-09-05 10:27:44 +02:00
block
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drivers scsi: storvsc: Remove WQ_MEM_RECLAIM from storvsc_error_wq 2022-09-05 10:27:44 +02:00
fs btrfs: check if root is readonly while setting security xattr 2022-09-05 10:27:43 +02:00
include asm-generic: sections: refactor memory_intersects 2022-09-05 10:27:43 +02:00
init
ipc
kernel sched/deadline: Fix priority inheritance with multiple scheduling classes 2022-09-05 10:27:39 +02:00
lib ratelimit: Fix data-races in ___ratelimit(). 2022-09-05 10:27:42 +02:00
LICENSES
mm mm: Force TLB flush for PFNMAP mappings before unlink_file_vma() 2022-09-05 10:27:44 +02:00
net net: Fix a data-race around sysctl_somaxconn. 2022-09-05 10:27:42 +02:00
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README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.