/* * Copyright (C) 2010 IBM Corporation * * Authors: * Mimi Zohar * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, version 2 of the License. * * File: evm_secfs.c * - Used to signal when key is on keyring * - Get the key and enable EVM */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include "evm.h" static struct dentry *evm_init_tpm; /** * evm_read_key - read() for /evm * * @filp: file pointer, not actually used * @buf: where to put the result * @count: maximum to send along * @ppos: where to start * * Returns number of bytes read or error code, as appropriate */ static ssize_t evm_read_key(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { char temp[80]; ssize_t rc; if (*ppos != 0) return 0; sprintf(temp, "%d", evm_initialized); rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); return rc; } /** * evm_write_key - write() for /evm * @file: file pointer, not actually used * @buf: where to get the data from * @count: bytes sent * @ppos: where to start * * Used to signal that key is on the kernel key ring. * - get the integrity hmac key from the kernel key ring * - create list of hmac protected extended attributes * Returns number of bytes written or error code, as appropriate */ static ssize_t evm_write_key(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { char temp[80]; int i; if (!capable(CAP_SYS_ADMIN) || (evm_initialized & EVM_INIT_HMAC)) return -EPERM; if (count >= sizeof(temp) || count == 0) return -EINVAL; if (copy_from_user(temp, buf, count) != 0) return -EFAULT; temp[count] = '\0'; if ((sscanf(temp, "%d", &i) != 1) || (i != 1)) return -EINVAL; evm_init_key(); return count; } static const struct file_operations evm_key_ops = { .read = evm_read_key, .write = evm_write_key, }; int __init evm_init_secfs(void) { int error = 0; evm_init_tpm = securityfs_create_file("evm", S_IRUSR | S_IRGRP, NULL, NULL, &evm_key_ops); if (!evm_init_tpm || IS_ERR(evm_init_tpm)) error = -EFAULT; return error; } tion='/cgit.cgi/linux/net-next.git/log/include/net/ip6_tunnel.h'>
path: root/include/net/ip6_tunnel.h
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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2017-02-03 17:10:28 +1100
committerMichael Ellerman <mpe@ellerman.id.au>2017-02-08 23:36:29 +1100
commitd7df2443cd5f67fc6ee7c05a88e4996e8177f91b (patch)
tree098a7c0ca4fceb8a65cb1f693c9d71990388933d /sound/soc/codecs/rt5514.c
parenta0615a16f7d0ceb5804d295203c302d496d8ee91 (diff)
powerpc/mm: Fix spurrious segfaults on radix with autonuma
When autonuma (Automatic NUMA balancing) marks a PTE inaccessible it clears all the protection bits but leave the PTE valid. With the Radix MMU, an attempt at executing from such a PTE will take a fault with bit 35 of SRR1 set "SRR1_ISI_N_OR_G". It is thus incorrect to treat all such faults as errors. We should pass them to handle_mm_fault() for autonuma to deal with. The case of pages that are really not executable is handled by the existing test for VM_EXEC further down. That leaves us with catching the kernel attempts at executing user pages. We can catch that earlier, even before we do find_vma. It is never valid on powerpc for the kernel to take an exec fault to begin with. So fold that test with the existing test for the kernel faulting on kernel addresses to bail out early. Fixes: 1d18ad026844 ("powerpc/mm: Detect instruction fetch denied and report") Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by: Balbir Singh <bsingharora@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'sound/soc/codecs/rt5514.c')