3da1cf1e88
there is an environment variable which shall initialize the SYSCTL during early boot. This works for all SYSCTL types both statically and dynamically created ones, except for the SYSCTL NODE type and SYSCTLs which belong to VNETs. A new flag, CTLFLAG_NOFETCH, has been added to be used in the case a tunable sysctl has a custom initialisation function allowing the sysctl to still be marked as a tunable. The kernel SYSCTL API is mostly the same, with a few exceptions for some special operations like iterating childrens of a static/extern SYSCTL node. This operation should probably be made into a factored out common macro, hence some device drivers use this. The reason for changing the SYSCTL API was the need for a SYSCTL parent OID pointer and not only the SYSCTL parent OID list pointer in order to quickly generate the sysctl path. The motivation behind this patch is to avoid parameter loading cludges inside the OFED driver subsystem. Instead of adding special code to the OFED driver subsystem to post-load tunables into dynamically created sysctls, we generalize this in the kernel. Other changes: - Corrected a possibly incorrect sysctl name from "hw.cbb.intr_mask" to "hw.pcic.intr_mask". - Removed redundant TUNABLE statements throughout the kernel. - Some minor code rewrites in connection to removing not needed TUNABLE statements. - Added a missing SYSCTL_DECL(). - Wrapped two very long lines. - Avoid malloc()/free() inside sysctl string handling, in case it is called to initialize a sysctl from a tunable, hence malloc()/free() is not ready when sysctls from the sysctl dataset are registered. - Bumped FreeBSD version to indicate SYSCTL API change. MFC after: 2 weeks Sponsored by: Mellanox Technologies
183 lines
4.9 KiB
C
183 lines
4.9 KiB
C
/*-
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* Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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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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* 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 AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/stack.h>
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#include <sys/sysctl.h>
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#include <vm/redzone.h>
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static SYSCTL_NODE(_vm, OID_AUTO, redzone, CTLFLAG_RW, NULL, "RedZone data");
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static u_long redzone_extra_mem = 0;
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SYSCTL_ULONG(_vm_redzone, OID_AUTO, extra_mem, CTLFLAG_RD, &redzone_extra_mem,
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0, "Extra memory allocated by redzone");
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static int redzone_panic = 0;
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SYSCTL_INT(_vm_redzone, OID_AUTO, panic, CTLFLAG_RWTUN, &redzone_panic, 0,
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"Panic when buffer corruption is detected");
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#define REDZONE_CHSIZE (16)
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#define REDZONE_CFSIZE (16)
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#define REDZONE_HSIZE (sizeof(struct stack) + sizeof(u_long) + REDZONE_CHSIZE)
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#define REDZONE_FSIZE (REDZONE_CFSIZE)
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static u_long
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redzone_roundup(u_long n)
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{
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if (n < REDZONE_HSIZE)
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n = REDZONE_HSIZE;
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if (n <= 128)
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return (128);
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else if (n <= 256)
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return (256);
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else if (n <= 512)
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return (512);
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else if (n <= 1024)
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return (1024);
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else if (n <= 2048)
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return (2048);
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return (PAGE_SIZE);
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}
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u_long
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redzone_get_size(caddr_t naddr)
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{
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u_long nsize;
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bcopy(naddr - REDZONE_CHSIZE - sizeof(u_long), &nsize, sizeof(nsize));
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return (nsize);
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}
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u_long
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redzone_size_ntor(u_long nsize)
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{
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return (nsize + redzone_roundup(nsize) + REDZONE_FSIZE);
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}
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void *
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redzone_addr_ntor(caddr_t naddr)
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{
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return (naddr - redzone_roundup(redzone_get_size(naddr)));
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}
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/*
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* Set redzones and remember allocation backtrace.
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*/
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void *
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redzone_setup(caddr_t raddr, u_long nsize)
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{
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struct stack st;
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caddr_t haddr, faddr;
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atomic_add_long(&redzone_extra_mem, redzone_size_ntor(nsize) - nsize);
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haddr = raddr + redzone_roundup(nsize) - REDZONE_HSIZE;
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faddr = haddr + REDZONE_HSIZE + nsize;
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/* Redzone header. */
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stack_save(&st);
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bcopy(&st, haddr, sizeof(st));
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haddr += sizeof(st);
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bcopy(&nsize, haddr, sizeof(nsize));
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haddr += sizeof(nsize);
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memset(haddr, 0x42, REDZONE_CHSIZE);
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haddr += REDZONE_CHSIZE;
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/* Redzone footer. */
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memset(faddr, 0x42, REDZONE_CFSIZE);
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return (haddr);
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}
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/*
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* Verify redzones.
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* This function is called on free() and realloc().
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*/
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void
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redzone_check(caddr_t naddr)
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{
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struct stack ast, fst;
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caddr_t haddr, faddr;
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u_int ncorruptions;
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u_long nsize;
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int i;
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haddr = naddr - REDZONE_HSIZE;
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bcopy(haddr, &ast, sizeof(ast));
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haddr += sizeof(ast);
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bcopy(haddr, &nsize, sizeof(nsize));
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haddr += sizeof(nsize);
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atomic_subtract_long(&redzone_extra_mem,
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redzone_size_ntor(nsize) - nsize);
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/* Look for buffer underflow. */
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ncorruptions = 0;
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for (i = 0; i < REDZONE_CHSIZE; i++, haddr++) {
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if (*(u_char *)haddr != 0x42)
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ncorruptions++;
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}
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if (ncorruptions > 0) {
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printf("REDZONE: Buffer underflow detected. %u byte%s "
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"corrupted before %p (%lu bytes allocated).\n",
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ncorruptions, ncorruptions == 1 ? "" : "s", naddr, nsize);
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printf("Allocation backtrace:\n");
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stack_print_ddb(&ast);
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printf("Free backtrace:\n");
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stack_save(&fst);
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stack_print_ddb(&fst);
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if (redzone_panic)
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panic("Stopping here.");
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}
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faddr = naddr + nsize;
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/* Look for buffer overflow. */
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ncorruptions = 0;
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for (i = 0; i < REDZONE_CFSIZE; i++, faddr++) {
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if (*(u_char *)faddr != 0x42)
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ncorruptions++;
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}
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if (ncorruptions > 0) {
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printf("REDZONE: Buffer overflow detected. %u byte%s corrupted "
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"after %p (%lu bytes allocated).\n", ncorruptions,
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ncorruptions == 1 ? "" : "s", naddr + nsize, nsize);
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printf("Allocation backtrace:\n");
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stack_print_ddb(&ast);
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printf("Free backtrace:\n");
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stack_save(&fst);
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stack_print_ddb(&fst);
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if (redzone_panic)
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panic("Stopping here.");
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}
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}
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