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| author | Johannes Berg <johannes.berg@intel.com> | 2021-01-14 00:08:02 +0300 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2021-02-12 23:31:08 +0300 |
| commit | 47da29763ec9a153b9b685bff9db659e4e09e494 (patch) | |
| tree | 05481f2a307bd8f7b5ded345b24c196dbf883302 /arch/um/os-Linux/signal.c | |
| parent | e1e22d0d9183aaaf65acf0cb529cb51ddbc12e08 (diff) | |
| download | linux-47da29763ec9a153b9b685bff9db659e4e09e494.tar.xz | |
um: mm: check more comprehensively for stub changes
If userspace tries to change the stub, we need to kill it,
because otherwise it can escape the virtual machine. In a
few cases the stub checks weren't good, e.g. if userspace
just tries to
mmap(0x100000 - 0x1000, 0x3000, ...)
it could succeed to get a new private/anonymous mapping
replacing the stubs. Fix this by checking everywhere, and
checking for _overlap_, not just direct changes.
Cc: stable@vger.kernel.org
Fixes: 3963333fe676 ("uml: cover stubs with a VMA")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um/os-Linux/signal.c')
0 files changed, 0 insertions, 0 deletions