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author | Ben Wolsieffer <ben.wolsieffer@hefring.com> | 2023-10-19 23:45:49 +0300 |
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committer | Ingo Molnar <mingo@kernel.org> | 2023-10-27 12:53:42 +0300 |
commit | c73801ae4f22b390228ebf471d55668e824198b6 (patch) | |
tree | 3ff2d2f1871b78a9f626c9457a421e3ea4343fe4 /arch/x86 | |
parent | 184fdf9fc7ae6ae7155768faa48fc609d1a24b7e (diff) | |
download | linux-c73801ae4f22b390228ebf471d55668e824198b6.tar.xz |
futex: Don't include process MM in futex key on no-MMU
On no-MMU, all futexes are treated as private because there is no need
to map a virtual address to physical to match the futex across
processes. This doesn't quite work though, because private futexes
include the current process's mm_struct as part of their key. This makes
it impossible for one process to wake up a shared futex being waited on
in another process.
Fix this bug by excluding the mm_struct from the key. With
a single address space, the futex address is already a unique key.
Fixes: 784bdf3bb694 ("futex: Assume all mappings are private on !MMU systems")
Signed-off-by: Ben Wolsieffer <ben.wolsieffer@hefring.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Darren Hart <dvhart@infradead.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: André Almeida <andrealmeid@igalia.com>
Link: https://lore.kernel.org/r/20231019204548.1236437-2-ben.wolsieffer@hefring.com
Diffstat (limited to 'arch/x86')
0 files changed, 0 insertions, 0 deletions