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Subject[tip:x86/cleanups] x86/dumpstack: Unify show_regs()
Commit-ID:  16d1cb0bc43642a4d934631a73c5210ad2499e2f
Gitweb: https://git.kernel.org/tip/16d1cb0bc43642a4d934631a73c5210ad2499e2f
Author: Borislav Petkov <bp@suse.de>
AuthorDate: Tue, 6 Mar 2018 10:49:14 +0100
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Thu, 8 Mar 2018 12:04:59 +0100

x86/dumpstack: Unify show_regs()

The 32-bit version uses KERN_EMERG and commit

b0f4c4b32c8e ("bugs, x86: Fix printk levels for panic, softlockups and stack dumps")

changed the 64-bit version to KERN_DEFAULT. The same justification in
that commit that those messages do not belong in the terminal, holds
true for 32-bit also, so make it so.

Make code_bytes static, while at it.

Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Link: https://lkml.kernel.org/r/20180306094920.16917-4-bp@alien8.de

---
arch/x86/include/asm/stacktrace.h | 2 --
arch/x86/kernel/dumpstack.c | 49 ++++++++++++++++++++++++++++++++++++++-
arch/x86/kernel/dumpstack_32.c | 42 ---------------------------------
arch/x86/kernel/dumpstack_64.c | 42 ---------------------------------
4 files changed, 48 insertions(+), 87 deletions(-)

diff --git a/arch/x86/include/asm/stacktrace.h b/arch/x86/include/asm/stacktrace.h
index f73706878772..133d9425fced 100644
--- a/arch/x86/include/asm/stacktrace.h
+++ b/arch/x86/include/asm/stacktrace.h
@@ -87,8 +87,6 @@ get_stack_pointer(struct task_struct *task, struct pt_regs *regs)
void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
unsigned long *stack, char *log_lvl);

-extern unsigned int code_bytes;
-
/* The form of the top of the frame on the stack */
struct stack_frame {
struct stack_frame *next_frame;
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index a2d8a3908670..18fa9d74c182 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -24,7 +24,7 @@

int panic_on_unrecovered_nmi;
int panic_on_io_nmi;
-unsigned int code_bytes = 64;
+static unsigned int code_bytes = 64;
static int die_counter;

bool in_task_stack(unsigned long *stack, struct task_struct *task,
@@ -375,3 +375,50 @@ static int __init code_bytes_setup(char *s)
return 1;
}
__setup("code_bytes=", code_bytes_setup);
+
+void show_regs(struct pt_regs *regs)
+{
+ bool all = true;
+ int i;
+
+ show_regs_print_info(KERN_DEFAULT);
+
+ if (IS_ENABLED(CONFIG_X86_32))
+ all = !user_mode(regs);
+
+ __show_regs(regs, all);
+
+ /*
+ * When in-kernel, we also print out the stack and code at the
+ * time of the fault..
+ */
+ if (!user_mode(regs)) {
+ unsigned int code_prologue = code_bytes * 43 / 64;
+ unsigned int code_len = code_bytes;
+ unsigned char c;
+ u8 *ip;
+
+ show_trace_log_lvl(current, regs, NULL, KERN_DEFAULT);
+
+ printk(KERN_DEFAULT "Code: ");
+
+ ip = (u8 *)regs->ip - code_prologue;
+ if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) {
+ /* try starting at IP */
+ ip = (u8 *)regs->ip;
+ code_len = code_len - code_prologue + 1;
+ }
+ for (i = 0; i < code_len; i++, ip++) {
+ if (ip < (u8 *)PAGE_OFFSET ||
+ probe_kernel_address(ip, c)) {
+ pr_cont(" Bad RIP value.");
+ break;
+ }
+ if (ip == (u8 *)regs->ip)
+ pr_cont("<%02x> ", c);
+ else
+ pr_cont("%02x ", c);
+ }
+ }
+ pr_cont("\n");
+}
diff --git a/arch/x86/kernel/dumpstack_32.c b/arch/x86/kernel/dumpstack_32.c
index 04170f63e3a1..cd53f3030e40 100644
--- a/arch/x86/kernel/dumpstack_32.c
+++ b/arch/x86/kernel/dumpstack_32.c
@@ -127,45 +127,3 @@ unknown:
info->type = STACK_TYPE_UNKNOWN;
return -EINVAL;
}
-
-void show_regs(struct pt_regs *regs)
-{
- int i;
-
- show_regs_print_info(KERN_EMERG);
- __show_regs(regs, !user_mode(regs));
-
- /*
- * When in-kernel, we also print out the stack and code at the
- * time of the fault..
- */
- if (!user_mode(regs)) {
- unsigned int code_prologue = code_bytes * 43 / 64;
- unsigned int code_len = code_bytes;
- unsigned char c;
- u8 *ip;
-
- show_trace_log_lvl(current, regs, NULL, KERN_EMERG);
-
- pr_emerg("Code:");
-
- ip = (u8 *)regs->ip - code_prologue;
- if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) {
- /* try starting at IP */
- ip = (u8 *)regs->ip;
- code_len = code_len - code_prologue + 1;
- }
- for (i = 0; i < code_len; i++, ip++) {
- if (ip < (u8 *)PAGE_OFFSET ||
- probe_kernel_address(ip, c)) {
- pr_cont(" Bad EIP value.");
- break;
- }
- if (ip == (u8 *)regs->ip)
- pr_cont(" <%02x>", c);
- else
- pr_cont(" %02x", c);
- }
- }
- pr_cont("\n");
-}
diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
index 563e28d14f2c..5cdb9e84da57 100644
--- a/arch/x86/kernel/dumpstack_64.c
+++ b/arch/x86/kernel/dumpstack_64.c
@@ -149,45 +149,3 @@ unknown:
info->type = STACK_TYPE_UNKNOWN;
return -EINVAL;
}
-
-void show_regs(struct pt_regs *regs)
-{
- int i;
-
- show_regs_print_info(KERN_DEFAULT);
- __show_regs(regs, 1);
-
- /*
- * When in-kernel, we also print out the stack and code at the
- * time of the fault..
- */
- if (!user_mode(regs)) {
- unsigned int code_prologue = code_bytes * 43 / 64;
- unsigned int code_len = code_bytes;
- unsigned char c;
- u8 *ip;
-
- show_trace_log_lvl(current, regs, NULL, KERN_DEFAULT);
-
- printk(KERN_DEFAULT "Code: ");
-
- ip = (u8 *)regs->ip - code_prologue;
- if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) {
- /* try starting at IP */
- ip = (u8 *)regs->ip;
- code_len = code_len - code_prologue + 1;
- }
- for (i = 0; i < code_len; i++, ip++) {
- if (ip < (u8 *)PAGE_OFFSET ||
- probe_kernel_address(ip, c)) {
- pr_cont(" Bad RIP value.");
- break;
- }
- if (ip == (u8 *)regs->ip)
- pr_cont("<%02x> ", c);
- else
- pr_cont("%02x ", c);
- }
- }
- pr_cont("\n");
-}
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