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-rw-r--r--arch/i386/kernel/signal.c7
-rw-r--r--arch/i386/kernel/traps.c7
-rw-r--r--arch/i386/mm/fault.c10
-rw-r--r--arch/x86_64/kernel/signal.c2
-rw-r--r--arch/x86_64/kernel/traps.c6
-rw-r--r--arch/x86_64/mm/fault.c15
-rw-r--r--arch/x86_64/mm/init.c33
7 files changed, 32 insertions, 48 deletions
diff --git a/arch/i386/kernel/signal.c b/arch/i386/kernel/signal.c
index d574e38f0f7..f5dd85656c1 100644
--- a/arch/i386/kernel/signal.c
+++ b/arch/i386/kernel/signal.c
@@ -199,6 +199,13 @@ asmlinkage int sys_sigreturn(unsigned long __unused)
return eax;
badframe:
+ if (show_unhandled_signals && printk_ratelimit())
+ printk("%s%s[%d] bad frame in sigreturn frame:%p eip:%lx"
+ " esp:%lx oeax:%lx\n",
+ current->pid > 1 ? KERN_INFO : KERN_EMERG,
+ current->comm, current->pid, frame, regs->eip,
+ regs->esp, regs->orig_eax);
+
force_sig(SIGSEGV, current);
return 0;
}
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index 57772a18c39..438949da3b6 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -618,6 +618,13 @@ fastcall void __kprobes do_general_protection(struct pt_regs * regs,
current->thread.error_code = error_code;
current->thread.trap_no = 13;
+ if (show_unhandled_signals && unhandled_signal(current, SIGSEGV) &&
+ printk_ratelimit())
+ printk(KERN_INFO
+ "%s[%d] general protection eip:%lx esp:%lx error:%lx\n",
+ current->comm, current->pid,
+ regs->eip, regs->esp, error_code);
+
force_sig(SIGSEGV, current);
return;
diff --git a/arch/i386/mm/fault.c b/arch/i386/mm/fault.c
index e92a1012493..01ffdd4964f 100644
--- a/arch/i386/mm/fault.c
+++ b/arch/i386/mm/fault.c
@@ -283,6 +283,8 @@ static inline int vmalloc_fault(unsigned long address)
return 0;
}
+int show_unhandled_signals = 1;
+
/*
* This routine handles page faults. It determines the address,
* and the problem, and then passes it off to one of the appropriate
@@ -469,6 +471,14 @@ bad_area_nosemaphore:
if (is_prefetch(regs, address, error_code))
return;
+ if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) &&
+ printk_ratelimit()) {
+ printk("%s%s[%d]: segfault at %08lx eip %08lx "
+ "esp %08lx error %lx\n",
+ tsk->pid > 1 ? KERN_INFO : KERN_EMERG,
+ tsk->comm, tsk->pid, address, regs->eip,
+ regs->esp, error_code);
+ }
tsk->thread.cr2 = address;
/* Kernel addresses are always protection faults */
tsk->thread.error_code = error_code | (address >= TASK_SIZE);
diff --git a/arch/x86_64/kernel/signal.c b/arch/x86_64/kernel/signal.c
index 4886afcd628..739175b01e0 100644
--- a/arch/x86_64/kernel/signal.c
+++ b/arch/x86_64/kernel/signal.c
@@ -487,7 +487,7 @@ do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags)
void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
{
struct task_struct *me = current;
- if (exception_trace)
+ if (show_unhandled_signals && printk_ratelimit())
printk("%s[%d] bad frame in %s frame:%p rip:%lx rsp:%lx orax:%lx\n",
me->comm,me->pid,where,frame,regs->rip,regs->rsp,regs->orig_rax);
diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index 8713ad4a4db..03888420775 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -584,7 +584,8 @@ static void __kprobes do_trap(int trapnr, int signr, char *str,
tsk->thread.error_code = error_code;
tsk->thread.trap_no = trapnr;
- if (exception_trace && unhandled_signal(tsk, signr))
+ if (show_unhandled_signals && unhandled_signal(tsk, signr) &&
+ printk_ratelimit())
printk(KERN_INFO
"%s[%d] trap %s rip:%lx rsp:%lx error:%lx\n",
tsk->comm, tsk->pid, str,
@@ -688,7 +689,8 @@ asmlinkage void __kprobes do_general_protection(struct pt_regs * regs,
tsk->thread.error_code = error_code;
tsk->thread.trap_no = 13;
- if (exception_trace && unhandled_signal(tsk, SIGSEGV))
+ if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) &&
+ printk_ratelimit())
printk(KERN_INFO
"%s[%d] general protection rip:%lx rsp:%lx error:%lx\n",
tsk->comm, tsk->pid,
diff --git a/arch/x86_64/mm/fault.c b/arch/x86_64/mm/fault.c
index 2074bddd4f0..5e9ac70c135 100644
--- a/arch/x86_64/mm/fault.c
+++ b/arch/x86_64/mm/fault.c
@@ -221,16 +221,6 @@ static int is_errata93(struct pt_regs *regs, unsigned long address)
return 0;
}
-int unhandled_signal(struct task_struct *tsk, int sig)
-{
- if (is_init(tsk))
- return 1;
- if (tsk->ptrace & PT_PTRACED)
- return 0;
- return (tsk->sighand->action[sig-1].sa.sa_handler == SIG_IGN) ||
- (tsk->sighand->action[sig-1].sa.sa_handler == SIG_DFL);
-}
-
static noinline void pgtable_bad(unsigned long address, struct pt_regs *regs,
unsigned long error_code)
{
@@ -302,7 +292,7 @@ static int vmalloc_fault(unsigned long address)
}
static int page_fault_trace;
-int exception_trace = 1;
+int show_unhandled_signals = 1;
/*
* This routine handles page faults. It determines the address,
@@ -494,7 +484,8 @@ bad_area_nosemaphore:
(address >> 32))
return;
- if (exception_trace && unhandled_signal(tsk, SIGSEGV)) {
+ if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) &&
+ printk_ratelimit()) {
printk(
"%s%s[%d]: segfault at %016lx rip %016lx rsp %016lx error %lx\n",
tsk->pid > 1 ? KERN_INFO : KERN_EMERG,
diff --git a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c
index 381c2ecd407..88678e82e23 100644
--- a/arch/x86_64/mm/init.c
+++ b/arch/x86_64/mm/init.c
@@ -697,39 +697,6 @@ int kern_addr_valid(unsigned long addr)
return pfn_valid(pte_pfn(*pte));
}
-#ifdef CONFIG_SYSCTL
-#include <linux/sysctl.h>
-
-static ctl_table debug_table2[] = {
- {
- .ctl_name = 99,
- .procname = "exception-trace",
- .data = &exception_trace,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {}
-};
-
-static ctl_table debug_root_table2[] = {
- {
- .ctl_name = CTL_DEBUG,
- .procname = "debug",
- .mode = 0555,
- .child = debug_table2
- },
- {}
-};
-
-static __init int x8664_sysctl_init(void)
-{
- register_sysctl_table(debug_root_table2);
- return 0;
-}
-__initcall(x8664_sysctl_init);
-#endif
-
/* A pseudo VMA to allow ptrace access for the vsyscall page. This only
covers the 64bit vsyscall page now. 32bit has a real VMA now and does
not need special handling anymore. */
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-29 11:36:40 +0000