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Oliver Xymoron <oxymoron@waste.org> wrote: > > This patch adds locking for SMP. Apparently Willy never managed to > revive his laptop with his version so I revived mine. hrm. I'm a random ignoramus. I'll look it over... Are you really sure that all the decisions about where to use spin_lock() vs spin_lock_irq() vs spin_lock_irqsave() are correct? They are non-obvious. > @@ -1619,18 +1660,23 @@ > if (!capable(CAP_SYS_ADMIN)) > return -EPERM; > p = (int *) arg; > + spin_lock(&random_state->lock); > ent_count = random_state->entropy_count; > if (put_user(ent_count, p++) || > get_user(size, p) || > put_user(random_state->poolinfo.poolwords, p++)) Cannot perform userspace access while holding a lock - a pagefault could occur, perform IO, schedule away and the same CPU tries to take the same lock via a different process. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||
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