This is a note to let you know that I've just added the patch titled
x86/alternative: Print unadorned pointers
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86alternative_Print_unadorned_pointers.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
Subject: x86/alternative: Print unadorned pointers
From: Borislav Petkov bp@xxxxxxx
Date: Fri Jan 26 13:11:36 2018 +0100
From: Borislav Petkov bp@xxxxxxx
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@xxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: riel@xxxxxxxxxx
Cc: ak@xxxxxxxxxxxxxxx
Cc: peterz@xxxxxxxxxxxxx
Cc: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
Cc: jikos@xxxxxxxxxx
Cc: luto@xxxxxxxxxxxxxx
Cc: dave.hansen@xxxxxxxxx
Cc: torvalds@xxxxxxxxxxxxxxxxxxxx
Cc: keescook@xxxxxxxxxx
Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Cc: tim.c.chen@xxxxxxxxxxxxxxx
Cc: gregkh@xxxxxxxxxxxxxxxxxxxx
Cc: pjt@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20180126121139.31959-2-bp@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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)
@@ -355,7 +355,7 @@ static void __init_or_module noinline op
add_nops(instr + (a->instrlen - a->padlen), a->padlen);
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);
}
@@ -376,7 +376,7 @@ void __init_or_module noinline apply_alt
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.
@@ -400,14 +400,14 @@ void __init_or_module noinline apply_alt
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;
@@ -433,7 +433,7 @@ void __init_or_module noinline apply_alt
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);
}
Patches currently in stable-queue which might be from bp@xxxxxxx are
queue-4.14/x86pti_Do_not_enable_PTI_on_CPUs_which_are_not_vulnerable_to_Meltdown.patch
queue-4.14/x86cpufeatures_Add_Intel_feature_bits_for_Speculation_Control.patch
queue-4.14/x86alternative_Print_unadorned_pointers.patch
queue-4.14/x86cpufeatures_Add_CPUID_7_EDX_CPUID_leaf.patch
queue-4.14/x86bugs_Drop_one_mitigation_from_dmesg.patch
queue-4.14/x86speculation_Simplify_indirect_branch_prediction_barrier().patch
queue-4.14/x86nospec_Fix_header_guards_names.patch
queue-4.14/x86retpoline_Simplify_vmexit_fill_RSB().patch
queue-4.14/x86cpufeatures_Clean_up_Spectre_v2_related_CPUID_flags.patch