diff --git a/arch/avr32/kernel/kprobes.c b/arch/avr32/kernel/kprobes.c index 4942ee662e0..20b1c9d8f94 100644 --- a/arch/avr32/kernel/kprobes.c +++ b/arch/avr32/kernel/kprobes.c @@ -22,6 +22,8 @@ DEFINE_PER_CPU(struct kprobe *, current_kprobe); static unsigned long kprobe_status; static struct pt_regs jprobe_saved_regs; +struct kretprobe_blackpoint kretprobe_blacklist[] = {{NULL, NULL}}; + int __kprobes arch_prepare_kprobe(struct kprobe *p) { int ret = 0; diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c index 5dc98b5abcf..5fd65d8302c 100644 --- a/arch/ia64/kernel/kprobes.c +++ b/arch/ia64/kernel/kprobes.c @@ -40,6 +40,8 @@ extern void jprobe_inst_return(void); DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL; DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk); +struct kretprobe_blackpoint kretprobe_blacklist[] = {{NULL, NULL}}; + enum instruction_type {A, I, M, F, B, L, X, u}; static enum instruction_type bundle_encoding[32][3] = { { M, I, I }, /* 00 */ diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c index 440f5a87271..5338e485571 100644 --- a/arch/powerpc/kernel/kprobes.c +++ b/arch/powerpc/kernel/kprobes.c @@ -38,6 +38,8 @@ DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL; DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk); +struct kretprobe_blackpoint kretprobe_blacklist[] = {{NULL, NULL}}; + int __kprobes arch_prepare_kprobe(struct kprobe *p) { int ret = 0; diff --git a/arch/s390/kernel/kprobes.c b/arch/s390/kernel/kprobes.c index e40373d9fbc..c5549a20628 100644 --- a/arch/s390/kernel/kprobes.c +++ b/arch/s390/kernel/kprobes.c @@ -33,6 +33,8 @@ DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL; DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk); +struct kretprobe_blackpoint kretprobe_blacklist[] = {{NULL, NULL}}; + int __kprobes arch_prepare_kprobe(struct kprobe *p) { /* Make sure the probe isn't going on a difficult instruction */ diff --git a/arch/sparc64/kernel/kprobes.c b/arch/sparc64/kernel/kprobes.c index c93a15b785f..d94f901d321 100644 --- a/arch/sparc64/kernel/kprobes.c +++ b/arch/sparc64/kernel/kprobes.c @@ -42,6 +42,8 @@ DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL; DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk); +struct kretprobe_blackpoint kretprobe_blacklist[] = {{NULL, NULL}}; + int __kprobes arch_prepare_kprobe(struct kprobe *p) { p->ainsn.insn[0] = *p->addr; diff --git a/arch/x86/kernel/kprobes_32.c b/arch/x86/kernel/kprobes_32.c index 06b86e5617f..90f778c04b3 100644 --- a/arch/x86/kernel/kprobes_32.c +++ b/arch/x86/kernel/kprobes_32.c @@ -41,6 +41,13 @@ void jprobe_return_end(void); DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL; DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk); +struct kretprobe_blackpoint kretprobe_blacklist[] = { + {"__switch_to", }, /* This function switches only current task, but + doesn't switch kernel stack.*/ + {NULL, NULL} /* Terminator */ +}; +const int kretprobe_blacklist_size = ARRAY_SIZE(kretprobe_blacklist); + /* insert a jmp code */ static __always_inline void set_jmp_op(void *from, void *to) { diff --git a/arch/x86/kernel/kprobes_64.c b/arch/x86/kernel/kprobes_64.c index 7c16506d681..681b801c5e2 100644 --- a/arch/x86/kernel/kprobes_64.c +++ b/arch/x86/kernel/kprobes_64.c @@ -48,6 +48,13 @@ static void __kprobes arch_copy_kprobe(struct kprobe *p); DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL; DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk); +struct kretprobe_blackpoint kretprobe_blacklist[] = { + {"__switch_to", }, /* This function switches only current task, but + doesn't switch kernel stack.*/ + {NULL, NULL} /* Terminator */ +}; +const int kretprobe_blacklist_size = ARRAY_SIZE(kretprobe_blacklist); + /* * returns non-zero if opcode modifies the interrupt flag. */ diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 7352d4b377e..6309b275cb9 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -581,7 +581,7 @@ static inline void __switch_to_xtra(struct task_struct *prev_p, * * Kprobes not supported here. Set the probe on schedule instead. */ -__kprobes struct task_struct * +struct task_struct * __switch_to(struct task_struct *prev_p, struct task_struct *next_p) { struct thread_struct *prev = &prev_p->thread, diff --git a/include/asm-avr32/kprobes.h b/include/asm-avr32/kprobes.h index 0f3e636e6e4..996cb656474 100644 --- a/include/asm-avr32/kprobes.h +++ b/include/asm-avr32/kprobes.h @@ -17,6 +17,8 @@ typedef u16 kprobe_opcode_t; #define BREAKPOINT_INSTRUCTION 0xd673 /* breakpoint */ #define MAX_INSN_SIZE 2 +#define kretprobe_blacklist_size 0 + #define arch_remove_kprobe(p) do { } while (0) /* Architecture specific copy of original instruction */ diff --git a/include/asm-ia64/kprobes.h b/include/asm-ia64/kprobes.h index 6c79edf24d7..a93ce9ef07f 100644 --- a/include/asm-ia64/kprobes.h +++ b/include/asm-ia64/kprobes.h @@ -83,6 +83,7 @@ struct kprobe_ctlblk { }; #define ARCH_SUPPORTS_KRETPROBES +#define kretprobe_blacklist_size 0 #define SLOT0_OPCODE_SHIFT (37) #define SLOT1_p1_OPCODE_SHIFT (37 - (64-46)) diff --git a/include/asm-powerpc/kprobes.h b/include/asm-powerpc/kprobes.h index c16973d5de6..afabad230db 100644 --- a/include/asm-powerpc/kprobes.h +++ b/include/asm-powerpc/kprobes.h @@ -82,6 +82,7 @@ typedef unsigned int kprobe_opcode_t; #define ARCH_SUPPORTS_KRETPROBES #define flush_insn_slot(p) do { } while (0) +#define kretprobe_blacklist_size 0 void kretprobe_trampoline(void); extern void arch_remove_kprobe(struct kprobe *p); diff --git a/include/asm-s390/kprobes.h b/include/asm-s390/kprobes.h index 8bc67cc9ffd..948db3d0d05 100644 --- a/include/asm-s390/kprobes.h +++ b/include/asm-s390/kprobes.h @@ -47,6 +47,7 @@ typedef u16 kprobe_opcode_t; : (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) #define ARCH_SUPPORTS_KRETPROBES +#define kretprobe_blacklist_size 0 #define KPROBE_SWAP_INST 0x10 diff --git a/include/asm-sparc64/kprobes.h b/include/asm-sparc64/kprobes.h index a04145b77f9..5020eaf67c2 100644 --- a/include/asm-sparc64/kprobes.h +++ b/include/asm-sparc64/kprobes.h @@ -10,6 +10,8 @@ typedef u32 kprobe_opcode_t; #define BREAKPOINT_INSTRUCTION_2 0x91d02071 /* ta 0x71 */ #define MAX_INSN_SIZE 2 +#define kretprobe_blacklist_size 0 + #define arch_remove_kprobe(p) do {} while (0) #define flush_insn_slot(p) \ diff --git a/include/asm-x86/kprobes_32.h b/include/asm-x86/kprobes_32.h index f2489d07ce8..b772d5b3868 100644 --- a/include/asm-x86/kprobes_32.h +++ b/include/asm-x86/kprobes_32.h @@ -45,6 +45,8 @@ typedef u8 kprobe_opcode_t; #define ARCH_SUPPORTS_KRETPROBES #define flush_insn_slot(p) do { } while (0) +extern const int kretprobe_blacklist_size; + void arch_remove_kprobe(struct kprobe *p); void kretprobe_trampoline(void); diff --git a/include/asm-x86/kprobes_64.h b/include/asm-x86/kprobes_64.h index 3f495e5308b..53f4d850735 100644 --- a/include/asm-x86/kprobes_64.h +++ b/include/asm-x86/kprobes_64.h @@ -42,6 +42,7 @@ typedef u8 kprobe_opcode_t; : (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) #define ARCH_SUPPORTS_KRETPROBES +extern const int kretprobe_blacklist_size; void kretprobe_trampoline(void); extern void arch_remove_kprobe(struct kprobe *p); diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h index 51464d12a4e..81891581e89 100644 --- a/include/linux/kprobes.h +++ b/include/linux/kprobes.h @@ -166,6 +166,12 @@ struct kretprobe_instance { struct task_struct *task; }; +struct kretprobe_blackpoint { + const char *name; + void *addr; +}; +extern struct kretprobe_blackpoint kretprobe_blacklist[]; + static inline void kretprobe_assert(struct kretprobe_instance *ri, unsigned long orig_ret_address, unsigned long trampoline_address) { diff --git a/kernel/kprobes.c b/kernel/kprobes.c index f9798ff7899..e3a5d817ac9 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -716,6 +716,18 @@ int __kprobes register_kretprobe(struct kretprobe *rp) int ret = 0; struct kretprobe_instance *inst; int i; + void *addr = rp->kp.addr; + + if (kretprobe_blacklist_size) { + if (addr == NULL) + kprobe_lookup_name(rp->kp.symbol_name, addr); + addr += rp->kp.offset; + + for (i = 0; kretprobe_blacklist[i].name != NULL; i++) { + if (kretprobe_blacklist[i].addr == addr) + return -EINVAL; + } + } rp->kp.pre_handler = pre_handler_kretprobe; rp->kp.post_handler = NULL; @@ -794,6 +806,17 @@ static int __init init_kprobes(void) INIT_HLIST_HEAD(&kretprobe_inst_table[i]); } + if (kretprobe_blacklist_size) { + /* lookup the function address from its name */ + for (i = 0; kretprobe_blacklist[i].name != NULL; i++) { + kprobe_lookup_name(kretprobe_blacklist[i].name, + kretprobe_blacklist[i].addr); + if (!kretprobe_blacklist[i].addr) + printk("kretprobe: lookup failed: %s\n", + kretprobe_blacklist[i].name); + } + } + /* By default, kprobes are enabled */ kprobe_enabled = true;