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-rw-r--r--arch/i386/Kconfig2
-rw-r--r--arch/i386/kernel/kprobes.c41
-rw-r--r--arch/i386/kernel/process.c6
-rw-r--r--arch/i386/kernel/smpboot.c1
-rw-r--r--arch/i386/kernel/sys_i386.c42
-rw-r--r--arch/i386/kernel/traps.c6
6 files changed, 62 insertions, 36 deletions
diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 3fd2f256f2be..af219e51734f 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -1142,7 +1142,7 @@ source "arch/i386/oprofile/Kconfig"
config KPROBES
bool "Kprobes (EXPERIMENTAL)"
- depends on EXPERIMENTAL && MODULES
+ depends on KALLSYMS && EXPERIMENTAL && MODULES
help
Kprobes allows you to trap at almost any kernel address and
execute a callback function. register_kprobe() establishes
diff --git a/arch/i386/kernel/kprobes.c b/arch/i386/kernel/kprobes.c
index afe6505ca0b3..d98e44b16fe2 100644
--- a/arch/i386/kernel/kprobes.c
+++ b/arch/i386/kernel/kprobes.c
@@ -230,20 +230,20 @@ void __kprobes arch_prepare_kretprobe(struct kretprobe *rp,
struct pt_regs *regs)
{
unsigned long *sara = (unsigned long *)&regs->esp;
- struct kretprobe_instance *ri;
- if ((ri = get_free_rp_inst(rp)) != NULL) {
- ri->rp = rp;
- ri->task = current;
+ struct kretprobe_instance *ri;
+
+ if ((ri = get_free_rp_inst(rp)) != NULL) {
+ ri->rp = rp;
+ ri->task = current;
ri->ret_addr = (kprobe_opcode_t *) *sara;
/* Replace the return addr with trampoline addr */
*sara = (unsigned long) &kretprobe_trampoline;
-
- add_rp_inst(ri);
- } else {
- rp->nmissed++;
- }
+ add_rp_inst(ri);
+ } else {
+ rp->nmissed++;
+ }
}
/*
@@ -359,7 +359,7 @@ no_kprobe:
void __kprobes kretprobe_trampoline_holder(void)
{
asm volatile ( ".global kretprobe_trampoline\n"
- "kretprobe_trampoline: \n"
+ "kretprobe_trampoline: \n"
" pushf\n"
/* skip cs, eip, orig_eax, es, ds */
" subl $20, %esp\n"
@@ -395,14 +395,15 @@ no_kprobe:
*/
fastcall void *__kprobes trampoline_handler(struct pt_regs *regs)
{
- struct kretprobe_instance *ri = NULL;
- struct hlist_head *head;
- struct hlist_node *node, *tmp;
+ struct kretprobe_instance *ri = NULL;
+ struct hlist_head *head, empty_rp;
+ struct hlist_node *node, *tmp;
unsigned long flags, orig_ret_address = 0;
unsigned long trampoline_address =(unsigned long)&kretprobe_trampoline;
+ INIT_HLIST_HEAD(&empty_rp);
spin_lock_irqsave(&kretprobe_lock, flags);
- head = kretprobe_inst_table_head(current);
+ head = kretprobe_inst_table_head(current);
/*
* It is possible to have multiple instances associated with a given
@@ -413,14 +414,14 @@ fastcall void *__kprobes trampoline_handler(struct pt_regs *regs)
* We can handle this because:
* - instances are always inserted at the head of the list
* - when multiple return probes are registered for the same
- * function, the first instance's ret_addr will point to the
+ * function, the first instance's ret_addr will point to the
* real return address, and all the rest will point to
* kretprobe_trampoline
*/
hlist_for_each_entry_safe(ri, node, tmp, head, hlist) {
- if (ri->task != current)
+ if (ri->task != current)
/* another task is sharing our hash bucket */
- continue;
+ continue;
if (ri->rp && ri->rp->handler){
__get_cpu_var(current_kprobe) = &ri->rp->kp;
@@ -429,7 +430,7 @@ fastcall void *__kprobes trampoline_handler(struct pt_regs *regs)
}
orig_ret_address = (unsigned long)ri->ret_addr;
- recycle_rp_inst(ri);
+ recycle_rp_inst(ri, &empty_rp);
if (orig_ret_address != trampoline_address)
/*
@@ -444,6 +445,10 @@ fastcall void *__kprobes trampoline_handler(struct pt_regs *regs)
spin_unlock_irqrestore(&kretprobe_lock, flags);
+ hlist_for_each_entry_safe(ri, node, tmp, &empty_rp, hlist) {
+ hlist_del(&ri->hlist);
+ kfree(ri);
+ }
return (void*)orig_ret_address;
}
diff --git a/arch/i386/kernel/process.c b/arch/i386/kernel/process.c
index 96cd0232e1e0..dad02a960e03 100644
--- a/arch/i386/kernel/process.c
+++ b/arch/i386/kernel/process.c
@@ -297,9 +297,9 @@ void show_regs(struct pt_regs * regs)
if (user_mode_vm(regs))
printk(" ESP: %04x:%08lx",0xffff & regs->xss,regs->esp);
printk(" EFLAGS: %08lx %s (%s %.*s)\n",
- regs->eflags, print_tainted(), system_utsname.release,
- (int)strcspn(system_utsname.version, " "),
- system_utsname.version);
+ regs->eflags, print_tainted(), init_utsname()->release,
+ (int)strcspn(init_utsname()->version, " "),
+ init_utsname()->version);
printk("EAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n",
regs->eax,regs->ebx,regs->ecx,regs->edx);
printk("ESI: %08lx EDI: %08lx EBP: %08lx",
diff --git a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c
index 0831f709f777..9d93ecf6d999 100644
--- a/arch/i386/kernel/smpboot.c
+++ b/arch/i386/kernel/smpboot.c
@@ -612,6 +612,7 @@ extern struct {
/* which logical CPUs are on which nodes */
cpumask_t node_2_cpu_mask[MAX_NUMNODES] __read_mostly =
{ [0 ... MAX_NUMNODES-1] = CPU_MASK_NONE };
+EXPORT_SYMBOL(node_2_cpu_mask);
/* which node each logical CPU is on */
int cpu_2_node[NR_CPUS] __read_mostly = { [0 ... NR_CPUS-1] = 0 };
EXPORT_SYMBOL(cpu_2_node);
diff --git a/arch/i386/kernel/sys_i386.c b/arch/i386/kernel/sys_i386.c
index 8fdb1fb17a5f..4048397f1740 100644
--- a/arch/i386/kernel/sys_i386.c
+++ b/arch/i386/kernel/sys_i386.c
@@ -21,6 +21,7 @@
#include <linux/utsname.h>
#include <asm/uaccess.h>
+#include <asm/unistd.h>
#include <asm/ipc.h>
/*
@@ -210,7 +211,7 @@ asmlinkage int sys_uname(struct old_utsname __user * name)
if (!name)
return -EFAULT;
down_read(&uts_sem);
- err=copy_to_user(name, &system_utsname, sizeof (*name));
+ err = copy_to_user(name, utsname(), sizeof (*name));
up_read(&uts_sem);
return err?-EFAULT:0;
}
@@ -226,16 +227,21 @@ asmlinkage int sys_olduname(struct oldold_utsname __user * name)
down_read(&uts_sem);
- error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN);
- error |= __put_user(0,name->sysname+__OLD_UTS_LEN);
- error |= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
- error |= __put_user(0,name->nodename+__OLD_UTS_LEN);
- error |= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN);
- error |= __put_user(0,name->release+__OLD_UTS_LEN);
- error |= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN);
- error |= __put_user(0,name->version+__OLD_UTS_LEN);
- error |= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
- error |= __put_user(0,name->machine+__OLD_UTS_LEN);
+ error = __copy_to_user(&name->sysname, &utsname()->sysname,
+ __OLD_UTS_LEN);
+ error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
+ error |= __copy_to_user(&name->nodename, &utsname()->nodename,
+ __OLD_UTS_LEN);
+ error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
+ error |= __copy_to_user(&name->release, &utsname()->release,
+ __OLD_UTS_LEN);
+ error |= __put_user(0, name->release + __OLD_UTS_LEN);
+ error |= __copy_to_user(&name->version, &utsname()->version,
+ __OLD_UTS_LEN);
+ error |= __put_user(0, name->version + __OLD_UTS_LEN);
+ error |= __copy_to_user(&name->machine, &utsname()->machine,
+ __OLD_UTS_LEN);
+ error |= __put_user(0, name->machine + __OLD_UTS_LEN);
up_read(&uts_sem);
@@ -243,3 +249,17 @@ asmlinkage int sys_olduname(struct oldold_utsname __user * name)
return error;
}
+
+
+/*
+ * Do a system call from kernel instead of calling sys_execve so we
+ * end up with proper pt_regs.
+ */
+int kernel_execve(const char *filename, char *const argv[], char *const envp[])
+{
+ long __res;
+ asm volatile ("push %%ebx ; movl %2,%%ebx ; int $0x80 ; pop %%ebx"
+ : "=a" (__res)
+ : "0" (__NR_execve),"ri" (filename),"c" (argv), "d" (envp) : "memory");
+ return __res;
+}
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index 6820b8d643c7..00489b706d27 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -357,9 +357,9 @@ void show_registers(struct pt_regs *regs)
KERN_EMERG "EIP: %04x:[<%08lx>] %s VLI\n"
KERN_EMERG "EFLAGS: %08lx (%s %.*s)\n",
smp_processor_id(), 0xffff & regs->xcs, regs->eip,
- print_tainted(), regs->eflags, system_utsname.release,
- (int)strcspn(system_utsname.version, " "),
- system_utsname.version);
+ print_tainted(), regs->eflags, init_utsname()->release,
+ (int)strcspn(init_utsname()->version, " "),
+ init_utsname()->version);
print_symbol(KERN_EMERG "EIP is at %s\n", regs->eip);
printk(KERN_EMERG "eax: %08lx ebx: %08lx ecx: %08lx edx: %08lx\n",
regs->eax, regs->ebx, regs->ecx, regs->edx);
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