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Dianzhang Chen authored
commit 993773d1 upstream. The index to access the threads tls array is controlled by userspace via syscall: sys_ptrace(), hence leading to a potential exploitation of the Spectre variant 1 vulnerability. The index can be controlled from: ptrace -> arch_ptrace -> do_get_thread_area. Fix this by sanitizing the user supplied index before using it to access the p->thread.tls_array. Signed-off-by:
Dianzhang Chen <dianzhangchen0@gmail.com> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Cc: bp@alien8.de Cc: hpa@zytor.com Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/1561524630-3642-1-git-send-email-dianzhangchen0@gmail.comSigned-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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