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(parent: f40ddce) | patch
Take mmap lock in cacheflush syscall
authorJann Horn <jannh@google.com>
Fri, 19 Feb 2021 06:59:35 +0000 (14:59 +0800)
committerLey Foon Tan <ley.foon.tan@intel.com>
Fri, 19 Feb 2021 07:01:59 +0000 (15:01 +0800)
commitc26958cb5a0d9053d1358258827638773f3d36ed
tree26c85414097e72c6a4462d50f7fe23a5044a134ftree | snapshot
parentf40ddce88593482919761f74910f42f4b84c004bcommit | diff
Take mmap lock in cacheflush syscall

We need to take the mmap lock around find_vma() and subsequent use of the
VMA. Otherwise, we can race with concurrent operations like munmap(), which
can lead to use-after-free accesses to freed VMAs.

Fixes: 1000197d8013 ("nios2: System calls handling")
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
arch/nios2/kernel/sys_nios2.c diff | blob | history
Domain: System / Kernel;