linux-kernel - [PATCH 4.9 46/92] x86/alternative: Print unadorned pointers

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Message-Id: <20180209133934.472824776@linuxfoundation.org>
Date:   Fri,  9 Feb 2018 14:39:15 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Borislav Petkov <bp@...e.de>,
        Thomas Gleixner <tglx@...utronix.de>, riel@...hat.com,
        ak@...ux.intel.com, peterz@...radead.org,
        David Woodhouse <dwmw2@...radead.org>, jikos@...nel.org,
        luto@...capital.net, dave.hansen@...el.com,
        torvalds@...ux-foundation.org, keescook@...gle.com,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        tim.c.chen@...ux.intel.com, pjt@...gle.com,
        David Woodhouse <dwmw@...zon.co.uk>,
        gregkh@...ux-foundation.org
Subject: [PATCH 4.9 46/92] x86/alternative: Print unadorned pointers

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Borislav Petkov <bp@...e.de>

(cherry picked from commit 0e6c16c652cadaffd25a6bb326ec10da5bcec6b4)

After commit ad67b74d2469 ("printk: hash addresses printed with %p")
pointers are being hashed when printed. However, this makes the alternative
debug output completely useless. Switch to %px in order to see the
unadorned kernel pointers.

Signed-off-by: Borislav Petkov <bp@...e.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: riel@...hat.com
Cc: ak@...ux.intel.com
Cc: peterz@...radead.org
Cc: David Woodhouse <dwmw2@...radead.org>
Cc: jikos@...nel.org
Cc: luto@...capital.net
Cc: dave.hansen@...el.com
Cc: torvalds@...ux-foundation.org
Cc: keescook@...gle.com
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: tim.c.chen@...ux.intel.com
Cc: gregkh@...ux-foundation.org
Cc: pjt@...gle.com
Link: https://lkml.kernel.org/r/20180126121139.31959-2-bp@alien8.de
Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/x86/kernel/alternative.c |   14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -298,7 +298,7 @@ recompute_jump(struct alt_instr *a, u8 *
 	tgt_rip  = next_rip + o_dspl;
 	n_dspl = tgt_rip - orig_insn;
 
-	DPRINTK("target RIP: %p, new_displ: 0x%x", tgt_rip, n_dspl);
+	DPRINTK("target RIP: %px, new_displ: 0x%x", tgt_rip, n_dspl);
 
 	if (tgt_rip - orig_insn >= 0) {
 		if (n_dspl - 2 <= 127)
@@ -352,7 +352,7 @@ static void __init_or_module optimize_no
 	sync_core();
 	local_irq_restore(flags);
 
-	DUMP_BYTES(instr, a->instrlen, "%p: [%d:%d) optimized NOPs: ",
+	DUMP_BYTES(instr, a->instrlen, "%px: [%d:%d) optimized NOPs: ",
 		   instr, a->instrlen - a->padlen, a->padlen);
 }
 
@@ -370,7 +370,7 @@ void __init_or_module apply_alternatives
 	u8 *instr, *replacement;
 	u8 insnbuf[MAX_PATCH_LEN];
 
-	DPRINTK("alt table %p -> %p", start, end);
+	DPRINTK("alt table %px, -> %px", start, end);
 	/*
 	 * The scan order should be from start to end. A later scanned
 	 * alternative code can overwrite previously scanned alternative code.
@@ -394,14 +394,14 @@ void __init_or_module apply_alternatives
 			continue;
 		}
 
-		DPRINTK("feat: %d*32+%d, old: (%p, len: %d), repl: (%p, len: %d), pad: %d",
+		DPRINTK("feat: %d*32+%d, old: (%px len: %d), repl: (%px, len: %d), pad: %d",
 			a->cpuid >> 5,
 			a->cpuid & 0x1f,
 			instr, a->instrlen,
 			replacement, a->replacementlen, a->padlen);
 
-		DUMP_BYTES(instr, a->instrlen, "%p: old_insn: ", instr);
-		DUMP_BYTES(replacement, a->replacementlen, "%p: rpl_insn: ", replacement);
+		DUMP_BYTES(instr, a->instrlen, "%px: old_insn: ", instr);
+		DUMP_BYTES(replacement, a->replacementlen, "%px: rpl_insn: ", replacement);
 
 		memcpy(insnbuf, replacement, a->replacementlen);
 		insnbuf_sz = a->replacementlen;
@@ -422,7 +422,7 @@ void __init_or_module apply_alternatives
 				 a->instrlen - a->replacementlen);
 			insnbuf_sz += a->instrlen - a->replacementlen;
 		}
-		DUMP_BYTES(insnbuf, insnbuf_sz, "%p: final_insn: ", instr);
+		DUMP_BYTES(insnbuf, insnbuf_sz, "%px: final_insn: ", instr);
 
 		text_poke_early(instr, insnbuf, insnbuf_sz);
 	}