https://github.com/torvalds/linux
Revision 41ac42f137080bc230b5882e3c88c392ab7f2d32 authored by Gerald Schaefer on 17 August 2022, 13:26:03 UTC, committed by Vasily Gorbik on 25 August 2022, 13:12:32 UTC
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 92f842eac7ee3 ("[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: 92f842eac7ee3 ("[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>
1 parent 13cccaf
Tip revision: 41ac42f137080bc230b5882e3c88c392ab7f2d32 authored by Gerald Schaefer on 17 August 2022, 13:26:03 UTC
s390/mm: do not trigger write fault when vma does not allow VM_WRITE
s390/mm: do not trigger write fault when vma does not allow VM_WRITE
Tip revision: 41ac42f
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| .cocciconfig | -rw-r--r-- | 59 bytes |
| .get_maintainer.ignore | -rw-r--r-- | 71 bytes |
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| COPYING | -rw-r--r-- | 496 bytes |
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| Kconfig | -rw-r--r-- | 555 bytes |
| MAINTAINERS | -rw-r--r-- | 663.5 KB |
| Makefile | -rw-r--r-- | 64.5 KB |
| README | -rw-r--r-- | 727 bytes |
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