Revision 78c56e53821a7ec3462ce448c1fe6a8d44358831 authored by Linus Torvalds on 30 September 2021, 19:00:46 UTC, committed by Linus Torvalds on 30 September 2021, 19:00:46 UTC
Pull rdma fixes from Jason Gunthorpe: "Not much too exciting here, although two syzkaller bugs that seem to have 9 lives may have finally been squashed. Several core bugs and a batch of driver bug fixes: - Fix compilation problems in qib and hfi1 - Do not corrupt the joined multicast group state when using SEND_ONLY - Several CMA bugs, a reference leak for listening and two syzkaller crashers - Various bug fixes for irdma - Fix a Sleeping while atomic bug in usnic - Properly sanitize kernel pointers in dmesg - Two bugs in the 64b CQE support for hns" * tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma: RDMA/hns: Add the check of the CQE size of the user space RDMA/hns: Fix the size setting error when copying CQE in clean_cq() RDMA/hfi1: Fix kernel pointer leak RDMA/usnic: Lock VF with mutex instead of spinlock RDMA/hns: Work around broken constant propagation in gcc 8 RDMA/cma: Ensure rdma_addr_cancel() happens before issuing more requests RDMA/cma: Do not change route.addr.src_addr.ss_family RDMA/irdma: Report correct WC error when there are MW bind errors RDMA/irdma: Report correct WC error when transport retry counter is exceeded RDMA/irdma: Validate number of CQ entries on create CQ RDMA/irdma: Skip CQP ring during a reset MAINTAINERS: Update Broadcom RDMA maintainers RDMA/cma: Fix listener leak in rdma_cma_listen_on_all() failure IB/cma: Do not send IGMP leaves for sendonly Multicast groups IB/qib: Fix clang confusion of NULL pointer comparison
hwpoison-inject.c
// SPDX-License-Identifier: GPL-2.0-only
/* Inject a hwpoison memory failure on a arbitrary pfn */
#include <linux/module.h>
#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/pagemap.h>
#include <linux/hugetlb.h>
#include "internal.h"
static struct dentry *hwpoison_dir;
static int hwpoison_inject(void *data, u64 val)
{
unsigned long pfn = val;
struct page *p;
struct page *hpage;
int err;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!pfn_valid(pfn))
return -ENXIO;
p = pfn_to_page(pfn);
hpage = compound_head(p);
if (!hwpoison_filter_enable)
goto inject;
shake_page(hpage);
/*
* This implies unable to support non-LRU pages.
*/
if (!PageLRU(hpage) && !PageHuge(p))
return 0;
/*
* do a racy check to make sure PG_hwpoison will only be set for
* the targeted owner (or on a free page).
* memory_failure() will redo the check reliably inside page lock.
*/
err = hwpoison_filter(hpage);
if (err)
return 0;
inject:
pr_info("Injecting memory failure at pfn %#lx\n", pfn);
return memory_failure(pfn, 0);
}
static int hwpoison_unpoison(void *data, u64 val)
{
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
return unpoison_memory(val);
}
DEFINE_DEBUGFS_ATTRIBUTE(hwpoison_fops, NULL, hwpoison_inject, "%lli\n");
DEFINE_DEBUGFS_ATTRIBUTE(unpoison_fops, NULL, hwpoison_unpoison, "%lli\n");
static void pfn_inject_exit(void)
{
debugfs_remove_recursive(hwpoison_dir);
}
static int pfn_inject_init(void)
{
hwpoison_dir = debugfs_create_dir("hwpoison", NULL);
/*
* Note that the below poison/unpoison interfaces do not involve
* hardware status change, hence do not require hardware support.
* They are mainly for testing hwpoison in software level.
*/
debugfs_create_file("corrupt-pfn", 0200, hwpoison_dir, NULL,
&hwpoison_fops);
debugfs_create_file("unpoison-pfn", 0200, hwpoison_dir, NULL,
&unpoison_fops);
debugfs_create_u32("corrupt-filter-enable", 0600, hwpoison_dir,
&hwpoison_filter_enable);
debugfs_create_u32("corrupt-filter-dev-major", 0600, hwpoison_dir,
&hwpoison_filter_dev_major);
debugfs_create_u32("corrupt-filter-dev-minor", 0600, hwpoison_dir,
&hwpoison_filter_dev_minor);
debugfs_create_u64("corrupt-filter-flags-mask", 0600, hwpoison_dir,
&hwpoison_filter_flags_mask);
debugfs_create_u64("corrupt-filter-flags-value", 0600, hwpoison_dir,
&hwpoison_filter_flags_value);
#ifdef CONFIG_MEMCG
debugfs_create_u64("corrupt-filter-memcg", 0600, hwpoison_dir,
&hwpoison_filter_memcg);
#endif
return 0;
}
module_init(pfn_inject_init);
module_exit(pfn_inject_exit);
MODULE_LICENSE("GPL");
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