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powerpc/mm: Don't log user reads to 0xffffffff
Running vdsotest leaves many times the following log: [ 79.629901] vdsotest[396]: User access of kernel address (ffffffff) - exploit attempt? (uid: 0) A pointer set to (-1) is likely a programming error similar to a NULL pointer and is not worth logging as an exploit attempt. Don't log user accesses to 0xffffffff. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/0728849e826ba16f1fbd6fa7f5c6cc87bd64e097.1577087627.git.christophe.leroy@c-s.fr
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@ -350,6 +350,9 @@ static void sanity_check_fault(bool is_write, bool is_user,
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* Userspace trying to access kernel address, we get PROTFAULT for that.
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*/
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if (is_user && address >= TASK_SIZE) {
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if ((long)address == -1)
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return;
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pr_crit_ratelimited("%s[%d]: User access of kernel address (%lx) - exploit attempt? (uid: %d)\n",
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current->comm, current->pid, address,
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from_kuid(&init_user_ns, current_uid()));
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