add boot partition size

hc

2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d

 kernel/arch/mips/kernel/kprobes.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  *  Kernel Probes (KProbes)
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  *  arch/mips/kernel/kprobes.c
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@@ -8,19 +9,6 @@
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  *  Some portions copied from the powerpc version.
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  *
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  *   Copyright (C) IBM Corporation, 2002, 2004
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- *
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- *  This program is free software; you can redistribute it and/or modify
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- *  it under the terms of the GNU General Public License as published by
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- *  the Free Software Foundation; version 2 of the License.
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- *
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- *  This program is distributed in the hope that it will be useful,
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- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- *  GNU General Public License for more details.
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- *
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- *  You should have received a copy of the GNU General Public License
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- *  along with this program; if not, write to the Free Software
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- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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  */
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13
 
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 #include <linux/kprobes.h>
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@@ -98,9 +86,9 @@
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 		goto out;
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 	}
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-	if ((probe_kernel_read(&prev_insn, p->addr - 1,
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-				sizeof(mips_instruction)) == 0) &&
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-				insn_has_delayslot(prev_insn)) {
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+	if (copy_from_kernel_nofault(&prev_insn, p->addr - 1,
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+			sizeof(mips_instruction)) == 0 &&
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+	    insn_has_delayslot(prev_insn)) {
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 		pr_notice("Kprobes for branch delayslot are not supported\n");
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 		ret = -EINVAL;
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 		goto out;
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@@ -232,7 +220,7 @@
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220
 
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 unaligned:
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 	pr_notice("%s: unaligned epc - sending SIGBUS.\n", current->comm);
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-	force_sig(SIGBUS, current);
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+	force_sig(SIGBUS);
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 	return -EFAULT;
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 }
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@@ -410,7 +398,7 @@
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 	return 1;
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 }
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400
 
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-static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
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+int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
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 {
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 	struct kprobe *cur = kprobe_running();
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404
 	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
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@@ -489,6 +477,7 @@
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 				      struct pt_regs *regs)
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 {
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 	ri->ret_addr = (kprobe_opcode_t *) regs->regs[31];
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+	ri->fp = NULL;
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 	/* Replace the return addr with trampoline addr */
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 	regs->regs[31] = (unsigned long)kretprobe_trampoline;
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@@ -500,57 +489,8 @@
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 static int __kprobes trampoline_probe_handler(struct kprobe *p,
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 						struct pt_regs *regs)
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 {
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-	struct kretprobe_instance *ri = NULL;
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-	struct hlist_head *head, empty_rp;
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-	struct hlist_node *tmp;
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-	unsigned long flags, orig_ret_address = 0;
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-	unsigned long trampoline_address = (unsigned long)kretprobe_trampoline;
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-
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-	INIT_HLIST_HEAD(&empty_rp);
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-	kretprobe_hash_lock(current, &head, &flags);
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-
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-	/*
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-	 * It is possible to have multiple instances associated with a given
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-	 * task either because an multiple functions in the call path
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-	 * have a return probe installed on them, and/or more than one return
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-	 * return probe was registered for a target function.
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-	 *
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-	 * We can handle this because:
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-	 *     - instances are always inserted at the head of the list
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-	 *     - when multiple return probes are registered for the same
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-	 *	 function, the first instance's ret_addr will point to the
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-	 *	 real return address, and all the rest will point to
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-	 *	 kretprobe_trampoline
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-	 */
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-	hlist_for_each_entry_safe(ri, tmp, head, hlist) {
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-		if (ri->task != current)
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-			/* another task is sharing our hash bucket */
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-			continue;
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-
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-		if (ri->rp && ri->rp->handler)
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-			ri->rp->handler(ri, regs);
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-
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-		orig_ret_address = (unsigned long)ri->ret_addr;
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-		recycle_rp_inst(ri, &empty_rp);
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-
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-		if (orig_ret_address != trampoline_address)
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-			/*
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-			 * This is the real return address. Any other
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-			 * instances associated with this task are for
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-			 * other calls deeper on the call stack
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-			 */
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-			break;
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-	}
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-
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-	kretprobe_assert(ri, orig_ret_address, trampoline_address);
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-	instruction_pointer(regs) = orig_ret_address;
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-
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-	kretprobe_hash_unlock(current, &flags);
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-
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-	hlist_for_each_entry_safe(ri, tmp, &empty_rp, hlist) {
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-		hlist_del(&ri->hlist);
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-		kfree(ri);
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-	}
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+	instruction_pointer(regs) = __kretprobe_trampoline_handler(regs,
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+						kretprobe_trampoline, NULL);
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 	/*
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 	 * By returning a non-zero value, we are telling
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 	 * kprobe_handler() that we don't want the post_handler