The physical address argument is essentially ignored by every dumper method. In addition, the dump routines don't actually pass a real address; every call to dump_append() passes a value of zero for physical. Reviewed by: markj MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D35173
212 lines
5.5 KiB
C
212 lines
5.5 KiB
C
/*-
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* Copyright (c) 2021-2022 Juniper Networks
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*
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* This software was developed by Mitchell Horne <mhorne@FreeBSD.org>
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* under sponsorship from Juniper Networks and Klara Systems.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/caprights.h>
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#include <sys/disk.h>
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#include <sys/eventhandler.h>
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#include <sys/fcntl.h>
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#include <sys/file.h>
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#include <sys/kerneldump.h>
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#include <sys/limits.h>
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#include <sys/malloc.h>
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#include <sys/namei.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <sys/vnode.h>
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#include <machine/vmparam.h>
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static dumper_start_t vnode_dumper_start;
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static dumper_t vnode_dump;
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static dumper_hdr_t vnode_write_headers;
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static struct sx livedump_sx;
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SX_SYSINIT(livedump, &livedump_sx, "Livedump sx");
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/*
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* Invoke a live minidump on the system.
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*/
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int
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livedump_start(int fd, int flags, uint8_t compression)
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{
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#if MINIDUMP_PAGE_TRACKING == 1
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struct dumperinfo di, *livedi;
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struct diocskerneldump_arg kda;
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struct vnode *vp;
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struct file *fp;
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void *rl_cookie;
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int error;
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error = priv_check(curthread, PRIV_KMEM_READ);
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if (error != 0)
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return (error);
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if (flags != 0)
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return (EINVAL);
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error = getvnode(curthread, fd, &cap_write_rights, &fp);
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if (error != 0)
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return (error);
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vp = fp->f_vnode;
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if ((fp->f_flag & FWRITE) == 0) {
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error = EBADF;
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goto drop;
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}
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/* Set up a new dumper. */
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bzero(&di, sizeof(di));
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di.dumper_start = vnode_dumper_start;
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di.dumper = vnode_dump;
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di.dumper_hdr = vnode_write_headers;
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di.blocksize = PAGE_SIZE; /* Arbitrary. */
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di.maxiosize = MAXDUMPPGS * PAGE_SIZE;
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bzero(&kda, sizeof(kda));
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kda.kda_compression = compression;
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error = dumper_create(&di, "livedump", &kda, &livedi);
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if (error != 0)
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goto drop;
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/* Only allow one livedump to proceed at a time. */
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if (sx_try_xlock(&livedump_sx) == 0) {
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dumper_destroy(livedi);
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error = EBUSY;
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goto drop;
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}
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/* To be used by the callback functions. */
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livedi->priv = vp;
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/* Lock the entire file range and vnode. */
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rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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EVENTHANDLER_INVOKE(livedumper_start, &error);
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if (error != 0)
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goto out;
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dump_savectx();
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error = minidumpsys(livedi, true);
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EVENTHANDLER_INVOKE(livedumper_finish);
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out:
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VOP_UNLOCK(vp);
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vn_rangelock_unlock(vp, rl_cookie);
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sx_xunlock(&livedump_sx);
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dumper_destroy(livedi);
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drop:
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fdrop(fp, curthread);
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return (error);
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#else
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return (EOPNOTSUPP);
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#endif /* MINIDUMP_PAGE_TRACKING == 1 */
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}
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int
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vnode_dumper_start(struct dumperinfo *di, void *key, uint32_t keysize)
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{
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/* Always begin with an offset of zero. */
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di->dumpoff = 0;
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KASSERT(keysize == 0, ("encryption not supported for livedumps"));
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return (0);
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}
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/*
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* Callback from dumpsys() to dump a chunk of memory.
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*
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* Parameters:
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* arg Opaque private pointer to vnode
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* virtual Virtual address (where to read the data from)
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* offset Offset from start of core file
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* length Data length
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*
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* Return value:
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* 0 on success
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* errno on error
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*/
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int
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vnode_dump(void *arg, void *virtual, off_t offset, size_t length)
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{
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struct vnode *vp;
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int error = 0;
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vp = arg;
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MPASS(vp != NULL);
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ASSERT_VOP_LOCKED(vp, __func__);
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EVENTHANDLER_INVOKE(livedumper_dump, virtual, offset, length, &error);
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if (error != 0)
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return (error);
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/* Done? */
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if (virtual == NULL)
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return (0);
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error = vn_rdwr(UIO_WRITE, vp, virtual, length, offset, UIO_SYSSPACE,
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IO_NODELOCKED, curthread->td_ucred, NOCRED, NULL, curthread);
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if (error != 0)
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uprintf("%s: error writing livedump block at offset %jx: %d\n",
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__func__, (uintmax_t)offset, error);
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return (error);
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}
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/*
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* Callback from dumpsys() to write out the dump header, placed at the end.
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*/
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int
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vnode_write_headers(struct dumperinfo *di, struct kerneldumpheader *kdh)
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{
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struct vnode *vp;
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int error;
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off_t offset;
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vp = di->priv;
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MPASS(vp != NULL);
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ASSERT_VOP_LOCKED(vp, __func__);
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/* Compensate for compression/encryption adjustment of dumpoff. */
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offset = roundup2(di->dumpoff, di->blocksize);
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/* Write the kernel dump header to the end of the file. */
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error = vn_rdwr(UIO_WRITE, vp, kdh, sizeof(*kdh), offset,
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UIO_SYSSPACE, IO_NODELOCKED, curthread->td_ucred, NOCRED, NULL,
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curthread);
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if (error != 0)
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uprintf("%s: error writing livedump header: %d\n", __func__,
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error);
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return (error);
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}
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