[PATCH 2/5] x86/dumpstack: Carve out Code: dumping into a function

From: Borislav Petkov
Date: Mon Feb 19 2018 - 15:29:15 EST


From: Borislav Petkov <bp@xxxxxxx>

No functionality change, carve it out into a separate function for later
changes.

Signed-off-by: Borislav Petkov <bp@xxxxxxx>
---
arch/x86/kernel/dumpstack.c | 57 ++++++++++++++++++++++++---------------------
1 file changed, 30 insertions(+), 27 deletions(-)

diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index 18fa9d74c182..954b1dd1c04a 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -376,10 +376,38 @@ static int __init code_bytes_setup(char *s)
}
__setup("code_bytes=", code_bytes_setup);

+static void show_opcodes(u8 *rip)
+{
+ unsigned int code_prologue = code_bytes * 43 / 64;
+ unsigned int code_len = code_bytes;
+ unsigned char c;
+ u8 *ip;
+ int i;
+
+ printk(KERN_DEFAULT "Code: ");
+
+ ip = (u8 *)rip - code_prologue;
+ if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) {
+ /* try starting at IP */
+ ip = (u8 *)rip;
+ 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 *)rip)
+ pr_cont("<%02x> ", c);
+ else
+ pr_cont("%02x ", c);
+ }
+ pr_cont("\n");
+}
+
void show_regs(struct pt_regs *regs)
{
bool all = true;
- int i;

show_regs_print_info(KERN_DEFAULT);

@@ -393,32 +421,7 @@ void show_regs(struct pt_regs *regs)
* 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);
- }
+ show_opcodes((u8 *)regs->ip);
}
- pr_cont("\n");
}
--
2.13.0