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![Markus Metzger](/assets/img/avatar_default.png)
Resend using different mail client Changes to the last version: - split implementation into two layers: ds/bts and ptrace - renamed TIF's - save/restore ds save area msr in __switch_to_xtra() - make block-stepping only look at BTF bit Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
1349 lines
32 KiB
C
1349 lines
32 KiB
C
/* By Ross Biro 1/23/92 */
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/*
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* Pentium III FXSR, SSE support
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* Gareth Hughes <gareth@valinux.com>, May 2000
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*
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* BTS tracing
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* Markus Metzger <markus.t.metzger@intel.com>, Dec 2007
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/security.h>
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#include <linux/audit.h>
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#include <linux/seccomp.h>
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#include <linux/signal.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/system.h>
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#include <asm/processor.h>
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#include <asm/i387.h>
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#include <asm/debugreg.h>
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#include <asm/ldt.h>
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#include <asm/desc.h>
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#include <asm/prctl.h>
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#include <asm/proto.h>
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#include <asm/ds.h>
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/*
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* The maximal size of a BTS buffer per traced task in number of BTS
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* records.
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*/
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#define PTRACE_BTS_BUFFER_MAX 4000
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/*
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* does not yet catch signals sent when the child dies.
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* in exit.c or in signal.c.
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*/
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/*
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* Determines which flags the user has access to [1 = access, 0 = no access].
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*/
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#define FLAG_MASK_32 ((unsigned long) \
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(X86_EFLAGS_CF | X86_EFLAGS_PF | \
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X86_EFLAGS_AF | X86_EFLAGS_ZF | \
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X86_EFLAGS_SF | X86_EFLAGS_TF | \
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X86_EFLAGS_DF | X86_EFLAGS_OF | \
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X86_EFLAGS_RF | X86_EFLAGS_AC))
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/*
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* Determines whether a value may be installed in a segment register.
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*/
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static inline bool invalid_selector(u16 value)
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{
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return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL);
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}
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#ifdef CONFIG_X86_32
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#define FLAG_MASK FLAG_MASK_32
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static long *pt_regs_access(struct pt_regs *regs, unsigned long regno)
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{
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BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0);
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regno >>= 2;
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if (regno > FS)
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--regno;
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return ®s->bx + regno;
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}
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static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
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{
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/*
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* Returning the value truncates it to 16 bits.
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*/
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unsigned int retval;
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if (offset != offsetof(struct user_regs_struct, gs))
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retval = *pt_regs_access(task_pt_regs(task), offset);
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else {
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retval = task->thread.gs;
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if (task == current)
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savesegment(gs, retval);
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}
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return retval;
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}
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static int set_segment_reg(struct task_struct *task,
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unsigned long offset, u16 value)
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{
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/*
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* The value argument was already truncated to 16 bits.
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*/
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if (invalid_selector(value))
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return -EIO;
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if (offset != offsetof(struct user_regs_struct, gs))
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*pt_regs_access(task_pt_regs(task), offset) = value;
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else {
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task->thread.gs = value;
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if (task == current)
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/*
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* The user-mode %gs is not affected by
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* kernel entry, so we must update the CPU.
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*/
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loadsegment(gs, value);
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}
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return 0;
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}
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static unsigned long debugreg_addr_limit(struct task_struct *task)
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{
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return TASK_SIZE - 3;
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}
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#else /* CONFIG_X86_64 */
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#define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT)
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static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset)
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{
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BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0);
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return ®s->r15 + (offset / sizeof(regs->r15));
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}
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static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
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{
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/*
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* Returning the value truncates it to 16 bits.
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*/
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unsigned int seg;
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switch (offset) {
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case offsetof(struct user_regs_struct, fs):
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if (task == current) {
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/* Older gas can't assemble movq %?s,%r?? */
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asm("movl %%fs,%0" : "=r" (seg));
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return seg;
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}
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return task->thread.fsindex;
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case offsetof(struct user_regs_struct, gs):
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if (task == current) {
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asm("movl %%gs,%0" : "=r" (seg));
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return seg;
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}
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return task->thread.gsindex;
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case offsetof(struct user_regs_struct, ds):
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if (task == current) {
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asm("movl %%ds,%0" : "=r" (seg));
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return seg;
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}
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return task->thread.ds;
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case offsetof(struct user_regs_struct, es):
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if (task == current) {
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asm("movl %%es,%0" : "=r" (seg));
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return seg;
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}
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return task->thread.es;
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case offsetof(struct user_regs_struct, cs):
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case offsetof(struct user_regs_struct, ss):
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break;
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}
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return *pt_regs_access(task_pt_regs(task), offset);
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}
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static int set_segment_reg(struct task_struct *task,
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unsigned long offset, u16 value)
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{
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/*
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* The value argument was already truncated to 16 bits.
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*/
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if (invalid_selector(value))
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return -EIO;
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switch (offset) {
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case offsetof(struct user_regs_struct,fs):
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/*
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* If this is setting fs as for normal 64-bit use but
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* setting fs_base has implicitly changed it, leave it.
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*/
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if ((value == FS_TLS_SEL && task->thread.fsindex == 0 &&
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task->thread.fs != 0) ||
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(value == 0 && task->thread.fsindex == FS_TLS_SEL &&
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task->thread.fs == 0))
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break;
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task->thread.fsindex = value;
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if (task == current)
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loadsegment(fs, task->thread.fsindex);
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break;
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case offsetof(struct user_regs_struct,gs):
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/*
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* If this is setting gs as for normal 64-bit use but
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* setting gs_base has implicitly changed it, leave it.
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*/
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if ((value == GS_TLS_SEL && task->thread.gsindex == 0 &&
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task->thread.gs != 0) ||
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(value == 0 && task->thread.gsindex == GS_TLS_SEL &&
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task->thread.gs == 0))
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break;
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task->thread.gsindex = value;
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if (task == current)
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load_gs_index(task->thread.gsindex);
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break;
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case offsetof(struct user_regs_struct,ds):
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task->thread.ds = value;
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if (task == current)
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loadsegment(ds, task->thread.ds);
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break;
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case offsetof(struct user_regs_struct,es):
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task->thread.es = value;
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if (task == current)
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loadsegment(es, task->thread.es);
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break;
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/*
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* Can't actually change these in 64-bit mode.
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*/
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case offsetof(struct user_regs_struct,cs):
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#ifdef CONFIG_IA32_EMULATION
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if (test_tsk_thread_flag(task, TIF_IA32))
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task_pt_regs(task)->cs = value;
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#endif
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break;
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case offsetof(struct user_regs_struct,ss):
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#ifdef CONFIG_IA32_EMULATION
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if (test_tsk_thread_flag(task, TIF_IA32))
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task_pt_regs(task)->ss = value;
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#endif
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break;
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}
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return 0;
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}
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static unsigned long debugreg_addr_limit(struct task_struct *task)
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{
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#ifdef CONFIG_IA32_EMULATION
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if (test_tsk_thread_flag(task, TIF_IA32))
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return IA32_PAGE_OFFSET - 3;
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#endif
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return TASK_SIZE64 - 7;
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}
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#endif /* CONFIG_X86_32 */
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static unsigned long get_flags(struct task_struct *task)
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{
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unsigned long retval = task_pt_regs(task)->flags;
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/*
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* If the debugger set TF, hide it from the readout.
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*/
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if (test_tsk_thread_flag(task, TIF_FORCED_TF))
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retval &= ~X86_EFLAGS_TF;
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return retval;
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}
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static int set_flags(struct task_struct *task, unsigned long value)
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{
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struct pt_regs *regs = task_pt_regs(task);
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/*
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* If the user value contains TF, mark that
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* it was not "us" (the debugger) that set it.
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* If not, make sure it stays set if we had.
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*/
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if (value & X86_EFLAGS_TF)
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clear_tsk_thread_flag(task, TIF_FORCED_TF);
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else if (test_tsk_thread_flag(task, TIF_FORCED_TF))
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value |= X86_EFLAGS_TF;
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regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK);
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return 0;
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}
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static int putreg(struct task_struct *child,
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unsigned long offset, unsigned long value)
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{
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switch (offset) {
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case offsetof(struct user_regs_struct, cs):
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case offsetof(struct user_regs_struct, ds):
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case offsetof(struct user_regs_struct, es):
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case offsetof(struct user_regs_struct, fs):
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case offsetof(struct user_regs_struct, gs):
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case offsetof(struct user_regs_struct, ss):
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return set_segment_reg(child, offset, value);
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case offsetof(struct user_regs_struct, flags):
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return set_flags(child, value);
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#ifdef CONFIG_X86_64
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case offsetof(struct user_regs_struct,fs_base):
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if (value >= TASK_SIZE_OF(child))
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return -EIO;
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/*
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* When changing the segment base, use do_arch_prctl
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* to set either thread.fs or thread.fsindex and the
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* corresponding GDT slot.
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*/
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if (child->thread.fs != value)
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return do_arch_prctl(child, ARCH_SET_FS, value);
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return 0;
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case offsetof(struct user_regs_struct,gs_base):
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/*
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* Exactly the same here as the %fs handling above.
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*/
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if (value >= TASK_SIZE_OF(child))
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return -EIO;
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if (child->thread.gs != value)
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return do_arch_prctl(child, ARCH_SET_GS, value);
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return 0;
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#endif
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}
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*pt_regs_access(task_pt_regs(child), offset) = value;
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return 0;
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}
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static unsigned long getreg(struct task_struct *task, unsigned long offset)
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{
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switch (offset) {
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case offsetof(struct user_regs_struct, cs):
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case offsetof(struct user_regs_struct, ds):
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case offsetof(struct user_regs_struct, es):
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case offsetof(struct user_regs_struct, fs):
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case offsetof(struct user_regs_struct, gs):
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case offsetof(struct user_regs_struct, ss):
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return get_segment_reg(task, offset);
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case offsetof(struct user_regs_struct, flags):
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return get_flags(task);
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#ifdef CONFIG_X86_64
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case offsetof(struct user_regs_struct, fs_base): {
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/*
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* do_arch_prctl may have used a GDT slot instead of
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* the MSR. To userland, it appears the same either
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* way, except the %fs segment selector might not be 0.
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*/
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unsigned int seg = task->thread.fsindex;
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if (task->thread.fs != 0)
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return task->thread.fs;
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if (task == current)
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asm("movl %%fs,%0" : "=r" (seg));
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if (seg != FS_TLS_SEL)
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return 0;
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return get_desc_base(&task->thread.tls_array[FS_TLS]);
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}
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case offsetof(struct user_regs_struct, gs_base): {
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/*
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* Exactly the same here as the %fs handling above.
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*/
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unsigned int seg = task->thread.gsindex;
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if (task->thread.gs != 0)
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return task->thread.gs;
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if (task == current)
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asm("movl %%gs,%0" : "=r" (seg));
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if (seg != GS_TLS_SEL)
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return 0;
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return get_desc_base(&task->thread.tls_array[GS_TLS]);
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}
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#endif
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}
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return *pt_regs_access(task_pt_regs(task), offset);
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}
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/*
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* This function is trivial and will be inlined by the compiler.
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* Having it separates the implementation details of debug
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* registers from the interface details of ptrace.
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*/
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static unsigned long ptrace_get_debugreg(struct task_struct *child, int n)
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{
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switch (n) {
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case 0: return child->thread.debugreg0;
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case 1: return child->thread.debugreg1;
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case 2: return child->thread.debugreg2;
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case 3: return child->thread.debugreg3;
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case 6: return child->thread.debugreg6;
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case 7: return child->thread.debugreg7;
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}
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return 0;
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}
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static int ptrace_set_debugreg(struct task_struct *child,
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int n, unsigned long data)
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{
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int i;
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if (unlikely(n == 4 || n == 5))
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return -EIO;
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if (n < 4 && unlikely(data >= debugreg_addr_limit(child)))
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return -EIO;
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switch (n) {
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case 0: child->thread.debugreg0 = data; break;
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case 1: child->thread.debugreg1 = data; break;
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case 2: child->thread.debugreg2 = data; break;
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case 3: child->thread.debugreg3 = data; break;
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case 6:
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if ((data & ~0xffffffffUL) != 0)
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return -EIO;
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child->thread.debugreg6 = data;
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break;
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case 7:
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/*
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* Sanity-check data. Take one half-byte at once with
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* check = (val >> (16 + 4*i)) & 0xf. It contains the
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* R/Wi and LENi bits; bits 0 and 1 are R/Wi, and bits
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* 2 and 3 are LENi. Given a list of invalid values,
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* we do mask |= 1 << invalid_value, so that
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* (mask >> check) & 1 is a correct test for invalid
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* values.
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*
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* R/Wi contains the type of the breakpoint /
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* watchpoint, LENi contains the length of the watched
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* data in the watchpoint case.
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*
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* The invalid values are:
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* - LENi == 0x10 (undefined), so mask |= 0x0f00. [32-bit]
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* - R/Wi == 0x10 (break on I/O reads or writes), so
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* mask |= 0x4444.
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* - R/Wi == 0x00 && LENi != 0x00, so we have mask |=
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* 0x1110.
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*
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* Finally, mask = 0x0f00 | 0x4444 | 0x1110 == 0x5f54.
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*
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* See the Intel Manual "System Programming Guide",
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* 15.2.4
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*
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* Note that LENi == 0x10 is defined on x86_64 in long
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* mode (i.e. even for 32-bit userspace software, but
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* 64-bit kernel), so the x86_64 mask value is 0x5454.
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* See the AMD manual no. 24593 (AMD64 System Programming)
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*/
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#ifdef CONFIG_X86_32
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#define DR7_MASK 0x5f54
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#else
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#define DR7_MASK 0x5554
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#endif
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data &= ~DR_CONTROL_RESERVED;
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for (i = 0; i < 4; i++)
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if ((DR7_MASK >> ((data >> (16 + 4*i)) & 0xf)) & 1)
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return -EIO;
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child->thread.debugreg7 = data;
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if (data)
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set_tsk_thread_flag(child, TIF_DEBUG);
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else
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clear_tsk_thread_flag(child, TIF_DEBUG);
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break;
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}
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return 0;
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}
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static int ptrace_bts_max_buffer_size(void)
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{
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return PTRACE_BTS_BUFFER_MAX;
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}
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static int ptrace_bts_get_buffer_size(struct task_struct *child)
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{
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if (!child->thread.ds_area_msr)
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return -ENXIO;
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return ds_get_bts_size((void *)child->thread.ds_area_msr);
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}
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static int ptrace_bts_get_index(struct task_struct *child)
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{
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if (!child->thread.ds_area_msr)
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return -ENXIO;
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return ds_get_bts_index((void *)child->thread.ds_area_msr);
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}
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static int ptrace_bts_read_record(struct task_struct *child,
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long index,
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struct bts_struct __user *out)
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{
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struct bts_struct ret;
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int retval;
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if (!child->thread.ds_area_msr)
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return -ENXIO;
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retval = ds_read_bts((void *)child->thread.ds_area_msr,
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index, &ret);
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if (retval)
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return retval;
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if (copy_to_user(out, &ret, sizeof(ret)))
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return -EFAULT;
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|
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return sizeof(ret);
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}
|
|
|
|
static int ptrace_bts_write_record(struct task_struct *child,
|
|
const struct bts_struct *in)
|
|
{
|
|
int retval;
|
|
|
|
if (!child->thread.ds_area_msr)
|
|
return -ENXIO;
|
|
|
|
retval = ds_write_bts((void *)child->thread.ds_area_msr, in);
|
|
if (retval)
|
|
return retval;
|
|
|
|
return sizeof(*in);
|
|
}
|
|
|
|
static int ptrace_bts_config(struct task_struct *child,
|
|
unsigned long options)
|
|
{
|
|
unsigned long debugctl_mask = ds_debugctl_mask();
|
|
int retval;
|
|
|
|
retval = ptrace_bts_get_buffer_size(child);
|
|
if (retval < 0)
|
|
return retval;
|
|
if (retval == 0)
|
|
return -ENXIO;
|
|
|
|
if (options & PTRACE_BTS_O_TRACE_TASK) {
|
|
child->thread.debugctlmsr |= debugctl_mask;
|
|
set_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
|
|
} else {
|
|
/* there is no way for us to check whether we 'own'
|
|
* the respective bits in the DEBUGCTL MSR, we're
|
|
* about to clear */
|
|
child->thread.debugctlmsr &= ~debugctl_mask;
|
|
|
|
if (!child->thread.debugctlmsr)
|
|
clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
|
|
}
|
|
|
|
if (options & PTRACE_BTS_O_TIMESTAMPS)
|
|
set_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
|
|
else
|
|
clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ptrace_bts_status(struct task_struct *child)
|
|
{
|
|
unsigned long debugctl_mask = ds_debugctl_mask();
|
|
int retval, status = 0;
|
|
|
|
retval = ptrace_bts_get_buffer_size(child);
|
|
if (retval < 0)
|
|
return retval;
|
|
if (retval == 0)
|
|
return -ENXIO;
|
|
|
|
if (ptrace_bts_get_buffer_size(child) <= 0)
|
|
return -ENXIO;
|
|
|
|
if (test_tsk_thread_flag(child, TIF_DEBUGCTLMSR) &&
|
|
child->thread.debugctlmsr & debugctl_mask)
|
|
status |= PTRACE_BTS_O_TRACE_TASK;
|
|
if (test_tsk_thread_flag(child, TIF_BTS_TRACE_TS))
|
|
status |= PTRACE_BTS_O_TIMESTAMPS;
|
|
|
|
return status;
|
|
}
|
|
|
|
static int ptrace_bts_allocate_bts(struct task_struct *child,
|
|
int size_in_records)
|
|
{
|
|
int retval = 0;
|
|
void *ds;
|
|
|
|
if (size_in_records < 0)
|
|
return -EINVAL;
|
|
|
|
if (size_in_records > ptrace_bts_max_buffer_size())
|
|
return -EINVAL;
|
|
|
|
if (size_in_records == 0) {
|
|
ptrace_bts_config(child, /* options = */ 0);
|
|
} else {
|
|
retval = ds_allocate(&ds, size_in_records);
|
|
if (retval)
|
|
return retval;
|
|
}
|
|
|
|
if (child->thread.ds_area_msr)
|
|
ds_free((void **)&child->thread.ds_area_msr);
|
|
|
|
child->thread.ds_area_msr = (unsigned long)ds;
|
|
if (child->thread.ds_area_msr)
|
|
set_tsk_thread_flag(child, TIF_DS_AREA_MSR);
|
|
else
|
|
clear_tsk_thread_flag(child, TIF_DS_AREA_MSR);
|
|
|
|
return retval;
|
|
}
|
|
|
|
void ptrace_bts_take_timestamp(struct task_struct *tsk,
|
|
enum bts_qualifier qualifier)
|
|
{
|
|
struct bts_struct rec = {
|
|
.qualifier = qualifier,
|
|
.variant.timestamp = sched_clock()
|
|
};
|
|
|
|
if (ptrace_bts_get_buffer_size(tsk) <= 0)
|
|
return;
|
|
|
|
ptrace_bts_write_record(tsk, &rec);
|
|
}
|
|
|
|
/*
|
|
* Called by kernel/ptrace.c when detaching..
|
|
*
|
|
* Make sure the single step bit is not set.
|
|
*/
|
|
void ptrace_disable(struct task_struct *child)
|
|
{
|
|
user_disable_single_step(child);
|
|
#ifdef TIF_SYSCALL_EMU
|
|
clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
|
|
#endif
|
|
ptrace_bts_config(child, /* options = */ 0);
|
|
if (child->thread.ds_area_msr) {
|
|
ds_free((void **)&child->thread.ds_area_msr);
|
|
clear_tsk_thread_flag(child, TIF_DS_AREA_MSR);
|
|
}
|
|
}
|
|
|
|
long arch_ptrace(struct task_struct *child, long request, long addr, long data)
|
|
{
|
|
int i, ret;
|
|
unsigned long __user *datap = (unsigned long __user *)data;
|
|
|
|
switch (request) {
|
|
/* when I and D space are separate, these will need to be fixed. */
|
|
case PTRACE_PEEKTEXT: /* read word at location addr. */
|
|
case PTRACE_PEEKDATA:
|
|
ret = generic_ptrace_peekdata(child, addr, data);
|
|
break;
|
|
|
|
/* read the word at location addr in the USER area. */
|
|
case PTRACE_PEEKUSR: {
|
|
unsigned long tmp;
|
|
|
|
ret = -EIO;
|
|
if ((addr & (sizeof(data) - 1)) || addr < 0 ||
|
|
addr >= sizeof(struct user))
|
|
break;
|
|
|
|
tmp = 0; /* Default return condition */
|
|
if (addr < sizeof(struct user_regs_struct))
|
|
tmp = getreg(child, addr);
|
|
else if (addr >= offsetof(struct user, u_debugreg[0]) &&
|
|
addr <= offsetof(struct user, u_debugreg[7])) {
|
|
addr -= offsetof(struct user, u_debugreg[0]);
|
|
tmp = ptrace_get_debugreg(child, addr / sizeof(data));
|
|
}
|
|
ret = put_user(tmp, datap);
|
|
break;
|
|
}
|
|
|
|
/* when I and D space are separate, this will have to be fixed. */
|
|
case PTRACE_POKETEXT: /* write the word at location addr. */
|
|
case PTRACE_POKEDATA:
|
|
ret = generic_ptrace_pokedata(child, addr, data);
|
|
break;
|
|
|
|
case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
|
|
ret = -EIO;
|
|
if ((addr & (sizeof(data) - 1)) || addr < 0 ||
|
|
addr >= sizeof(struct user))
|
|
break;
|
|
|
|
if (addr < sizeof(struct user_regs_struct))
|
|
ret = putreg(child, addr, data);
|
|
else if (addr >= offsetof(struct user, u_debugreg[0]) &&
|
|
addr <= offsetof(struct user, u_debugreg[7])) {
|
|
addr -= offsetof(struct user, u_debugreg[0]);
|
|
ret = ptrace_set_debugreg(child,
|
|
addr / sizeof(data), data);
|
|
}
|
|
break;
|
|
|
|
case PTRACE_GETREGS: { /* Get all gp regs from the child. */
|
|
if (!access_ok(VERIFY_WRITE, datap, sizeof(struct user_regs_struct))) {
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
for (i = 0; i < sizeof(struct user_regs_struct); i += sizeof(long)) {
|
|
__put_user(getreg(child, i), datap);
|
|
datap++;
|
|
}
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
case PTRACE_SETREGS: { /* Set all gp regs in the child. */
|
|
unsigned long tmp;
|
|
if (!access_ok(VERIFY_READ, datap, sizeof(struct user_regs_struct))) {
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
for (i = 0; i < sizeof(struct user_regs_struct); i += sizeof(long)) {
|
|
__get_user(tmp, datap);
|
|
putreg(child, i, tmp);
|
|
datap++;
|
|
}
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
case PTRACE_GETFPREGS: { /* Get the child FPU state. */
|
|
if (!access_ok(VERIFY_WRITE, datap,
|
|
sizeof(struct user_i387_struct))) {
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
ret = 0;
|
|
if (!tsk_used_math(child))
|
|
init_fpu(child);
|
|
get_fpregs((struct user_i387_struct __user *)data, child);
|
|
break;
|
|
}
|
|
|
|
case PTRACE_SETFPREGS: { /* Set the child FPU state. */
|
|
if (!access_ok(VERIFY_READ, datap,
|
|
sizeof(struct user_i387_struct))) {
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
set_stopped_child_used_math(child);
|
|
set_fpregs(child, (struct user_i387_struct __user *)data);
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
#ifdef CONFIG_X86_32
|
|
case PTRACE_GETFPXREGS: { /* Get the child extended FPU state. */
|
|
if (!access_ok(VERIFY_WRITE, datap,
|
|
sizeof(struct user_fxsr_struct))) {
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
if (!tsk_used_math(child))
|
|
init_fpu(child);
|
|
ret = get_fpxregs((struct user_fxsr_struct __user *)data, child);
|
|
break;
|
|
}
|
|
|
|
case PTRACE_SETFPXREGS: { /* Set the child extended FPU state. */
|
|
if (!access_ok(VERIFY_READ, datap,
|
|
sizeof(struct user_fxsr_struct))) {
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
set_stopped_child_used_math(child);
|
|
ret = set_fpxregs(child, (struct user_fxsr_struct __user *)data);
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
|
|
case PTRACE_GET_THREAD_AREA:
|
|
if (addr < 0)
|
|
return -EIO;
|
|
ret = do_get_thread_area(child, addr,
|
|
(struct user_desc __user *) data);
|
|
break;
|
|
|
|
case PTRACE_SET_THREAD_AREA:
|
|
if (addr < 0)
|
|
return -EIO;
|
|
ret = do_set_thread_area(child, addr,
|
|
(struct user_desc __user *) data, 0);
|
|
break;
|
|
#endif
|
|
|
|
#ifdef CONFIG_X86_64
|
|
/* normal 64bit interface to access TLS data.
|
|
Works just like arch_prctl, except that the arguments
|
|
are reversed. */
|
|
case PTRACE_ARCH_PRCTL:
|
|
ret = do_arch_prctl(child, data, addr);
|
|
break;
|
|
#endif
|
|
|
|
case PTRACE_BTS_MAX_BUFFER_SIZE:
|
|
ret = ptrace_bts_max_buffer_size();
|
|
break;
|
|
|
|
case PTRACE_BTS_ALLOCATE_BUFFER:
|
|
ret = ptrace_bts_allocate_bts(child, data);
|
|
break;
|
|
|
|
case PTRACE_BTS_GET_BUFFER_SIZE:
|
|
ret = ptrace_bts_get_buffer_size(child);
|
|
break;
|
|
|
|
case PTRACE_BTS_GET_INDEX:
|
|
ret = ptrace_bts_get_index(child);
|
|
break;
|
|
|
|
case PTRACE_BTS_READ_RECORD:
|
|
ret = ptrace_bts_read_record
|
|
(child, data,
|
|
(struct bts_struct __user *) addr);
|
|
break;
|
|
|
|
case PTRACE_BTS_CONFIG:
|
|
ret = ptrace_bts_config(child, data);
|
|
break;
|
|
|
|
case PTRACE_BTS_STATUS:
|
|
ret = ptrace_bts_status(child);
|
|
break;
|
|
|
|
default:
|
|
ret = ptrace_request(child, request, addr, data);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_IA32_EMULATION
|
|
|
|
#include <linux/compat.h>
|
|
#include <linux/syscalls.h>
|
|
#include <asm/ia32.h>
|
|
#include <asm/fpu32.h>
|
|
#include <asm/user32.h>
|
|
|
|
#define R32(l,q) \
|
|
case offsetof(struct user32, regs.l): \
|
|
regs->q = value; break
|
|
|
|
#define SEG32(rs) \
|
|
case offsetof(struct user32, regs.rs): \
|
|
return set_segment_reg(child, \
|
|
offsetof(struct user_regs_struct, rs), \
|
|
value); \
|
|
break
|
|
|
|
static int putreg32(struct task_struct *child, unsigned regno, u32 value)
|
|
{
|
|
struct pt_regs *regs = task_pt_regs(child);
|
|
|
|
switch (regno) {
|
|
|
|
SEG32(cs);
|
|
SEG32(ds);
|
|
SEG32(es);
|
|
SEG32(fs);
|
|
SEG32(gs);
|
|
SEG32(ss);
|
|
|
|
R32(ebx, bx);
|
|
R32(ecx, cx);
|
|
R32(edx, dx);
|
|
R32(edi, di);
|
|
R32(esi, si);
|
|
R32(ebp, bp);
|
|
R32(eax, ax);
|
|
R32(orig_eax, orig_ax);
|
|
R32(eip, ip);
|
|
R32(esp, sp);
|
|
|
|
case offsetof(struct user32, regs.eflags):
|
|
return set_flags(child, value);
|
|
|
|
case offsetof(struct user32, u_debugreg[0]) ...
|
|
offsetof(struct user32, u_debugreg[7]):
|
|
regno -= offsetof(struct user32, u_debugreg[0]);
|
|
return ptrace_set_debugreg(child, regno / 4, value);
|
|
|
|
default:
|
|
if (regno > sizeof(struct user32) || (regno & 3))
|
|
return -EIO;
|
|
|
|
/*
|
|
* Other dummy fields in the virtual user structure
|
|
* are ignored
|
|
*/
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#undef R32
|
|
#undef SEG32
|
|
|
|
#define R32(l,q) \
|
|
case offsetof(struct user32, regs.l): \
|
|
*val = regs->q; break
|
|
|
|
#define SEG32(rs) \
|
|
case offsetof(struct user32, regs.rs): \
|
|
*val = get_segment_reg(child, \
|
|
offsetof(struct user_regs_struct, rs)); \
|
|
break
|
|
|
|
static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
|
|
{
|
|
struct pt_regs *regs = task_pt_regs(child);
|
|
|
|
switch (regno) {
|
|
|
|
SEG32(ds);
|
|
SEG32(es);
|
|
SEG32(fs);
|
|
SEG32(gs);
|
|
|
|
R32(cs, cs);
|
|
R32(ss, ss);
|
|
R32(ebx, bx);
|
|
R32(ecx, cx);
|
|
R32(edx, dx);
|
|
R32(edi, di);
|
|
R32(esi, si);
|
|
R32(ebp, bp);
|
|
R32(eax, ax);
|
|
R32(orig_eax, orig_ax);
|
|
R32(eip, ip);
|
|
R32(esp, sp);
|
|
|
|
case offsetof(struct user32, regs.eflags):
|
|
*val = get_flags(child);
|
|
break;
|
|
|
|
case offsetof(struct user32, u_debugreg[0]) ...
|
|
offsetof(struct user32, u_debugreg[7]):
|
|
regno -= offsetof(struct user32, u_debugreg[0]);
|
|
*val = ptrace_get_debugreg(child, regno / 4);
|
|
break;
|
|
|
|
default:
|
|
if (regno > sizeof(struct user32) || (regno & 3))
|
|
return -EIO;
|
|
|
|
/*
|
|
* Other dummy fields in the virtual user structure
|
|
* are ignored
|
|
*/
|
|
*val = 0;
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#undef R32
|
|
#undef SEG32
|
|
|
|
static long ptrace32_siginfo(unsigned request, u32 pid, u32 addr, u32 data)
|
|
{
|
|
siginfo_t __user *si = compat_alloc_user_space(sizeof(siginfo_t));
|
|
compat_siginfo_t __user *si32 = compat_ptr(data);
|
|
siginfo_t ssi;
|
|
int ret;
|
|
|
|
if (request == PTRACE_SETSIGINFO) {
|
|
memset(&ssi, 0, sizeof(siginfo_t));
|
|
ret = copy_siginfo_from_user32(&ssi, si32);
|
|
if (ret)
|
|
return ret;
|
|
if (copy_to_user(si, &ssi, sizeof(siginfo_t)))
|
|
return -EFAULT;
|
|
}
|
|
ret = sys_ptrace(request, pid, addr, (unsigned long)si);
|
|
if (ret)
|
|
return ret;
|
|
if (request == PTRACE_GETSIGINFO) {
|
|
if (copy_from_user(&ssi, si, sizeof(siginfo_t)))
|
|
return -EFAULT;
|
|
ret = copy_siginfo_to_user32(si32, &ssi);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
|
|
{
|
|
struct task_struct *child;
|
|
struct pt_regs *childregs;
|
|
void __user *datap = compat_ptr(data);
|
|
int ret;
|
|
__u32 val;
|
|
|
|
switch (request) {
|
|
case PTRACE_TRACEME:
|
|
case PTRACE_ATTACH:
|
|
case PTRACE_KILL:
|
|
case PTRACE_CONT:
|
|
case PTRACE_SINGLESTEP:
|
|
case PTRACE_SINGLEBLOCK:
|
|
case PTRACE_DETACH:
|
|
case PTRACE_SYSCALL:
|
|
case PTRACE_OLDSETOPTIONS:
|
|
case PTRACE_SETOPTIONS:
|
|
case PTRACE_SET_THREAD_AREA:
|
|
case PTRACE_GET_THREAD_AREA:
|
|
case PTRACE_BTS_MAX_BUFFER_SIZE:
|
|
case PTRACE_BTS_ALLOCATE_BUFFER:
|
|
case PTRACE_BTS_GET_BUFFER_SIZE:
|
|
case PTRACE_BTS_GET_INDEX:
|
|
case PTRACE_BTS_READ_RECORD:
|
|
case PTRACE_BTS_CONFIG:
|
|
case PTRACE_BTS_STATUS:
|
|
return sys_ptrace(request, pid, addr, data);
|
|
|
|
default:
|
|
return -EINVAL;
|
|
|
|
case PTRACE_PEEKTEXT:
|
|
case PTRACE_PEEKDATA:
|
|
case PTRACE_POKEDATA:
|
|
case PTRACE_POKETEXT:
|
|
case PTRACE_POKEUSR:
|
|
case PTRACE_PEEKUSR:
|
|
case PTRACE_GETREGS:
|
|
case PTRACE_SETREGS:
|
|
case PTRACE_SETFPREGS:
|
|
case PTRACE_GETFPREGS:
|
|
case PTRACE_SETFPXREGS:
|
|
case PTRACE_GETFPXREGS:
|
|
case PTRACE_GETEVENTMSG:
|
|
break;
|
|
|
|
case PTRACE_SETSIGINFO:
|
|
case PTRACE_GETSIGINFO:
|
|
return ptrace32_siginfo(request, pid, addr, data);
|
|
}
|
|
|
|
child = ptrace_get_task_struct(pid);
|
|
if (IS_ERR(child))
|
|
return PTR_ERR(child);
|
|
|
|
ret = ptrace_check_attach(child, request == PTRACE_KILL);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
childregs = task_pt_regs(child);
|
|
|
|
switch (request) {
|
|
case PTRACE_PEEKDATA:
|
|
case PTRACE_PEEKTEXT:
|
|
ret = 0;
|
|
if (access_process_vm(child, addr, &val, sizeof(u32), 0) !=
|
|
sizeof(u32))
|
|
ret = -EIO;
|
|
else
|
|
ret = put_user(val, (unsigned int __user *)datap);
|
|
break;
|
|
|
|
case PTRACE_POKEDATA:
|
|
case PTRACE_POKETEXT:
|
|
ret = 0;
|
|
if (access_process_vm(child, addr, &data, sizeof(u32), 1) !=
|
|
sizeof(u32))
|
|
ret = -EIO;
|
|
break;
|
|
|
|
case PTRACE_PEEKUSR:
|
|
ret = getreg32(child, addr, &val);
|
|
if (ret == 0)
|
|
ret = put_user(val, (__u32 __user *)datap);
|
|
break;
|
|
|
|
case PTRACE_POKEUSR:
|
|
ret = putreg32(child, addr, data);
|
|
break;
|
|
|
|
case PTRACE_GETREGS: { /* Get all gp regs from the child. */
|
|
int i;
|
|
|
|
if (!access_ok(VERIFY_WRITE, datap, 16*4)) {
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
ret = 0;
|
|
for (i = 0; i < sizeof(struct user_regs_struct32); i += sizeof(__u32)) {
|
|
getreg32(child, i, &val);
|
|
ret |= __put_user(val, (u32 __user *)datap);
|
|
datap += sizeof(u32);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case PTRACE_SETREGS: { /* Set all gp regs in the child. */
|
|
unsigned long tmp;
|
|
int i;
|
|
|
|
if (!access_ok(VERIFY_READ, datap, 16*4)) {
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
ret = 0;
|
|
for (i = 0; i < sizeof(struct user_regs_struct32); i += sizeof(u32)) {
|
|
ret |= __get_user(tmp, (u32 __user *)datap);
|
|
putreg32(child, i, tmp);
|
|
datap += sizeof(u32);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case PTRACE_GETFPREGS:
|
|
ret = -EIO;
|
|
if (!access_ok(VERIFY_READ, compat_ptr(data),
|
|
sizeof(struct user_i387_struct)))
|
|
break;
|
|
save_i387_ia32(child, datap, childregs, 1);
|
|
ret = 0;
|
|
break;
|
|
|
|
case PTRACE_SETFPREGS:
|
|
ret = -EIO;
|
|
if (!access_ok(VERIFY_WRITE, datap,
|
|
sizeof(struct user_i387_struct)))
|
|
break;
|
|
ret = 0;
|
|
/* don't check EFAULT to be bug-to-bug compatible to i386 */
|
|
restore_i387_ia32(child, datap, 1);
|
|
break;
|
|
|
|
case PTRACE_GETFPXREGS: {
|
|
struct user32_fxsr_struct __user *u = datap;
|
|
|
|
init_fpu(child);
|
|
ret = -EIO;
|
|
if (!access_ok(VERIFY_WRITE, u, sizeof(*u)))
|
|
break;
|
|
ret = -EFAULT;
|
|
if (__copy_to_user(u, &child->thread.i387.fxsave, sizeof(*u)))
|
|
break;
|
|
ret = __put_user(childregs->cs, &u->fcs);
|
|
ret |= __put_user(child->thread.ds, &u->fos);
|
|
break;
|
|
}
|
|
case PTRACE_SETFPXREGS: {
|
|
struct user32_fxsr_struct __user *u = datap;
|
|
|
|
unlazy_fpu(child);
|
|
ret = -EIO;
|
|
if (!access_ok(VERIFY_READ, u, sizeof(*u)))
|
|
break;
|
|
/*
|
|
* no checking to be bug-to-bug compatible with i386.
|
|
* but silence warning
|
|
*/
|
|
if (__copy_from_user(&child->thread.i387.fxsave, u, sizeof(*u)))
|
|
;
|
|
set_stopped_child_used_math(child);
|
|
child->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
case PTRACE_GETEVENTMSG:
|
|
ret = put_user(child->ptrace_message,
|
|
(unsigned int __user *)compat_ptr(data));
|
|
break;
|
|
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
out:
|
|
put_task_struct(child);
|
|
return ret;
|
|
}
|
|
|
|
#endif /* CONFIG_IA32_EMULATION */
|
|
|
|
#ifdef CONFIG_X86_32
|
|
|
|
void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)
|
|
{
|
|
struct siginfo info;
|
|
|
|
tsk->thread.trap_no = 1;
|
|
tsk->thread.error_code = error_code;
|
|
|
|
memset(&info, 0, sizeof(info));
|
|
info.si_signo = SIGTRAP;
|
|
info.si_code = TRAP_BRKPT;
|
|
|
|
/* User-mode ip? */
|
|
info.si_addr = user_mode_vm(regs) ? (void __user *) regs->ip : NULL;
|
|
|
|
/* Send us the fake SIGTRAP */
|
|
force_sig_info(SIGTRAP, &info, tsk);
|
|
}
|
|
|
|
/* notification of system call entry/exit
|
|
* - triggered by current->work.syscall_trace
|
|
*/
|
|
__attribute__((regparm(3)))
|
|
int do_syscall_trace(struct pt_regs *regs, int entryexit)
|
|
{
|
|
int is_sysemu = test_thread_flag(TIF_SYSCALL_EMU);
|
|
/*
|
|
* With TIF_SYSCALL_EMU set we want to ignore TIF_SINGLESTEP for syscall
|
|
* interception
|
|
*/
|
|
int is_singlestep = !is_sysemu && test_thread_flag(TIF_SINGLESTEP);
|
|
int ret = 0;
|
|
|
|
/* do the secure computing check first */
|
|
if (!entryexit)
|
|
secure_computing(regs->orig_ax);
|
|
|
|
if (unlikely(current->audit_context)) {
|
|
if (entryexit)
|
|
audit_syscall_exit(AUDITSC_RESULT(regs->ax),
|
|
regs->ax);
|
|
/* Debug traps, when using PTRACE_SINGLESTEP, must be sent only
|
|
* on the syscall exit path. Normally, when TIF_SYSCALL_AUDIT is
|
|
* not used, entry.S will call us only on syscall exit, not
|
|
* entry; so when TIF_SYSCALL_AUDIT is used we must avoid
|
|
* calling send_sigtrap() on syscall entry.
|
|
*
|
|
* Note that when PTRACE_SYSEMU_SINGLESTEP is used,
|
|
* is_singlestep is false, despite his name, so we will still do
|
|
* the correct thing.
|
|
*/
|
|
else if (is_singlestep)
|
|
goto out;
|
|
}
|
|
|
|
if (!(current->ptrace & PT_PTRACED))
|
|
goto out;
|
|
|
|
/* If a process stops on the 1st tracepoint with SYSCALL_TRACE
|
|
* and then is resumed with SYSEMU_SINGLESTEP, it will come in
|
|
* here. We have to check this and return */
|
|
if (is_sysemu && entryexit)
|
|
return 0;
|
|
|
|
/* Fake a debug trap */
|
|
if (is_singlestep)
|
|
send_sigtrap(current, regs, 0);
|
|
|
|
if (!test_thread_flag(TIF_SYSCALL_TRACE) && !is_sysemu)
|
|
goto out;
|
|
|
|
/* the 0x80 provides a way for the tracing parent to distinguish
|
|
between a syscall stop and SIGTRAP delivery */
|
|
/* Note that the debugger could change the result of test_thread_flag!*/
|
|
ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ? 0x80:0));
|
|
|
|
/*
|
|
* this isn't the same as continuing with a signal, but it will do
|
|
* for normal use. strace only continues with a signal if the
|
|
* stopping signal is not SIGTRAP. -brl
|
|
*/
|
|
if (current->exit_code) {
|
|
send_sig(current->exit_code, current, 1);
|
|
current->exit_code = 0;
|
|
}
|
|
ret = is_sysemu;
|
|
out:
|
|
if (unlikely(current->audit_context) && !entryexit)
|
|
audit_syscall_entry(AUDIT_ARCH_I386, regs->orig_ax,
|
|
regs->bx, regs->cx, regs->dx, regs->si);
|
|
if (ret == 0)
|
|
return 0;
|
|
|
|
regs->orig_ax = -1; /* force skip of syscall restarting */
|
|
if (unlikely(current->audit_context))
|
|
audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
|
|
return 1;
|
|
}
|
|
|
|
#else /* CONFIG_X86_64 */
|
|
|
|
static void syscall_trace(struct pt_regs *regs)
|
|
{
|
|
|
|
#if 0
|
|
printk("trace %s ip %lx sp %lx ax %d origrax %d caller %lx tiflags %x ptrace %x\n",
|
|
current->comm,
|
|
regs->ip, regs->sp, regs->ax, regs->orig_ax, __builtin_return_address(0),
|
|
current_thread_info()->flags, current->ptrace);
|
|
#endif
|
|
|
|
ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
|
|
? 0x80 : 0));
|
|
/*
|
|
* this isn't the same as continuing with a signal, but it will do
|
|
* for normal use. strace only continues with a signal if the
|
|
* stopping signal is not SIGTRAP. -brl
|
|
*/
|
|
if (current->exit_code) {
|
|
send_sig(current->exit_code, current, 1);
|
|
current->exit_code = 0;
|
|
}
|
|
}
|
|
|
|
asmlinkage void syscall_trace_enter(struct pt_regs *regs)
|
|
{
|
|
/* do the secure computing check first */
|
|
secure_computing(regs->orig_ax);
|
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACE)
|
|
&& (current->ptrace & PT_PTRACED))
|
|
syscall_trace(regs);
|
|
|
|
if (unlikely(current->audit_context)) {
|
|
if (test_thread_flag(TIF_IA32)) {
|
|
audit_syscall_entry(AUDIT_ARCH_I386,
|
|
regs->orig_ax,
|
|
regs->bx, regs->cx,
|
|
regs->dx, regs->si);
|
|
} else {
|
|
audit_syscall_entry(AUDIT_ARCH_X86_64,
|
|
regs->orig_ax,
|
|
regs->di, regs->si,
|
|
regs->dx, regs->r10);
|
|
}
|
|
}
|
|
}
|
|
|
|
asmlinkage void syscall_trace_leave(struct pt_regs *regs)
|
|
{
|
|
if (unlikely(current->audit_context))
|
|
audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
|
|
|
|
if ((test_thread_flag(TIF_SYSCALL_TRACE)
|
|
|| test_thread_flag(TIF_SINGLESTEP))
|
|
&& (current->ptrace & PT_PTRACED))
|
|
syscall_trace(regs);
|
|
}
|
|
|
|
#endif /* CONFIG_X86_32 */
|