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| author | Jann Horn <jannh@google.com> | 2018-06-25 18:34:10 +0200 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2018-08-11 09:05:53 +0200 |
| commit | 42a0cc3478584d4d63f68f2f5af021ddbea771fa (patch) | |
| tree | 8dc33625ea1c8488e01965f159ef3f597eba42cb /README | |
| parent | userns: move user access out of the mutex (diff) | |
| download | linux-42a0cc3478584d4d63f68f2f5af021ddbea771fa.tar.xz linux-42a0cc3478584d4d63f68f2f5af021ddbea771fa.zip | |
sys: don't hold uts_sem while accessing userspace memory
Holding uts_sem as a writer while accessing userspace memory allows a
namespace admin to stall all processes that attempt to take uts_sem.
Instead, move data through stack buffers and don't access userspace memory
while uts_sem is held.
Cc: stable@vger.kernel.org
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'README')
0 files changed, 0 insertions, 0 deletions