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| author |   Dmitry Safonov <dima@arista.com> | 2019-11-12 01:27:13 +0000 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2020-01-14 12:20:58 +0100 |
| commit | af34ebeb866fafc0a9a09dda51c52ccec007ace0 (patch) | |
| tree | c81dda29e5d7b2fde4e73568d1dd9b74fe87f3ff /mm/mmap.c | |
| parent | time: Allocate per-timens vvar page (diff) | |
| download | linux-dev-af34ebeb866fafc0a9a09dda51c52ccec007ace0.tar.xz linux-dev-af34ebeb866fafc0a9a09dda51c52ccec007ace0.zip | |
x86/vdso: Handle faults on timens page
If a task belongs to a time namespace then the VVAR page which contains
the system wide VDSO data is replaced with a namespace specific page
which has the same layout as the VVAR page.
Co-developed-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20191112012724.250792-25-dima@arista.com
Diffstat (limited to 'mm/mmap.c')
| -rw-r--r-- | mm/mmap.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 9c648524e4dc..60c17d3c8762 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -3342,6 +3342,8 @@ static const struct vm_operations_struct special_mapping_vmops = { .fault = special_mapping_fault, .mremap = special_mapping_mremap, .name = special_mapping_name, + /* vDSO code relies that VVAR can't be accessed remotely */ + .access = NULL, }; static const struct vm_operations_struct legacy_special_mapping_vmops = { |