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Diffstat (limited to 'arch/x86/kernel/ptrace.c')
-rw-r--r--arch/x86/kernel/ptrace.c98
1 files changed, 61 insertions, 37 deletions
diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index 0a6d8c12e10..2c8ec1ba75e 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -668,14 +668,14 @@ static int ptrace_bts_read_record(struct task_struct *child, size_t index,
size_t bts_index, bts_end;
int error;
- error = ds_get_bts_end(child, &bts_end);
+ error = ds_get_bts_end(child->bts, &bts_end);
if (error < 0)
return error;
if (bts_end <= index)
return -EINVAL;
- error = ds_get_bts_index(child, &bts_index);
+ error = ds_get_bts_index(child->bts, &bts_index);
if (error < 0)
return error;
@@ -684,7 +684,7 @@ static int ptrace_bts_read_record(struct task_struct *child, size_t index,
if (bts_end <= bts_index)
bts_index -= bts_end;
- error = ds_access_bts(child, bts_index, &bts_record);
+ error = ds_access_bts(child->bts, bts_index, &bts_record);
if (error < 0)
return error;
@@ -705,14 +705,14 @@ static int ptrace_bts_drain(struct task_struct *child,
size_t end, i;
int error;
- error = ds_get_bts_index(child, &end);
+ error = ds_get_bts_index(child->bts, &end);
if (error < 0)
return error;
if (size < (end * sizeof(struct bts_struct)))
return -EIO;
- error = ds_access_bts(child, 0, (const void **)&raw);
+ error = ds_access_bts(child->bts, 0, (const void **)&raw);
if (error < 0)
return error;
@@ -723,18 +723,13 @@ static int ptrace_bts_drain(struct task_struct *child,
return -EFAULT;
}
- error = ds_clear_bts(child);
+ error = ds_clear_bts(child->bts);
if (error < 0)
return error;
return end;
}
-static void ptrace_bts_ovfl(struct task_struct *child)
-{
- send_sig(child->thread.bts_ovfl_signal, child, 0);
-}
-
static int ptrace_bts_config(struct task_struct *child,
long cfg_size,
const struct ptrace_bts_config __user *ucfg)
@@ -760,23 +755,45 @@ static int ptrace_bts_config(struct task_struct *child,
goto errout;
if (cfg.flags & PTRACE_BTS_O_ALLOC) {
- ds_ovfl_callback_t ovfl = NULL;
+ bts_ovfl_callback_t ovfl = NULL;
unsigned int sig = 0;
- /* we ignore the error in case we were not tracing child */
- (void)ds_release_bts(child);
+ error = -EINVAL;
+ if (cfg.size < (10 * bts_cfg.sizeof_bts))
+ goto errout;
if (cfg.flags & PTRACE_BTS_O_SIGNAL) {
if (!cfg.signal)
goto errout;
+ error = -EOPNOTSUPP;
+ goto errout;
+
sig = cfg.signal;
- ovfl = ptrace_bts_ovfl;
}
- error = ds_request_bts(child, /* base = */ NULL, cfg.size, ovfl);
- if (error < 0)
+ if (child->bts) {
+ (void)ds_release_bts(child->bts);
+ kfree(child->bts_buffer);
+
+ child->bts = NULL;
+ child->bts_buffer = NULL;
+ }
+
+ error = -ENOMEM;
+ child->bts_buffer = kzalloc(cfg.size, GFP_KERNEL);
+ if (!child->bts_buffer)
+ goto errout;
+
+ child->bts = ds_request_bts(child, child->bts_buffer, cfg.size,
+ ovfl, /* th = */ (size_t)-1);
+ if (IS_ERR(child->bts)) {
+ error = PTR_ERR(child->bts);
+ kfree(child->bts_buffer);
+ child->bts = NULL;
+ child->bts_buffer = NULL;
goto errout;
+ }
child->thread.bts_ovfl_signal = sig;
}
@@ -823,15 +840,15 @@ static int ptrace_bts_status(struct task_struct *child,
if (cfg_size < sizeof(cfg))
return -EIO;
- error = ds_get_bts_end(child, &end);
+ error = ds_get_bts_end(child->bts, &end);
if (error < 0)
return error;
- error = ds_access_bts(child, /* index = */ 0, &base);
+ error = ds_access_bts(child->bts, /* index = */ 0, &base);
if (error < 0)
return error;
- error = ds_access_bts(child, /* index = */ end, &max);
+ error = ds_access_bts(child->bts, /* index = */ end, &max);
if (error < 0)
return error;
@@ -884,10 +901,7 @@ static int ptrace_bts_write_record(struct task_struct *child,
return -EINVAL;
}
- /* The writing task will be the switched-to task on a context
- * switch. It needs to write into the switched-from task's BTS
- * buffer. */
- return ds_unchecked_write_bts(child, bts_record, bts_cfg.sizeof_bts);
+ return ds_write_bts(child->bts, bts_record, bts_cfg.sizeof_bts);
}
void ptrace_bts_take_timestamp(struct task_struct *tsk,
@@ -929,17 +943,16 @@ void __cpuinit ptrace_bts_init_intel(struct cpuinfo_x86 *c)
switch (c->x86) {
case 0x6:
switch (c->x86_model) {
+ case 0 ... 0xC:
+ /* sorry, don't know about them */
+ break;
case 0xD:
case 0xE: /* Pentium M */
bts_configure(&bts_cfg_pentium_m);
break;
- case 0xF: /* Core2 */
- case 0x1C: /* Atom */
+ default: /* Core2, Atom, ... */
bts_configure(&bts_cfg_core2);
break;
- default:
- /* sorry, don't know about them */
- break;
}
break;
case 0xF:
@@ -973,13 +986,17 @@ void ptrace_disable(struct task_struct *child)
clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
#endif
#ifdef CONFIG_X86_PTRACE_BTS
- (void)ds_release_bts(child);
+ if (child->bts) {
+ (void)ds_release_bts(child->bts);
+ kfree(child->bts_buffer);
+ child->bts_buffer = NULL;
- child->thread.debugctlmsr &= ~bts_cfg.debugctl_mask;
- if (!child->thread.debugctlmsr)
- clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
+ child->thread.debugctlmsr &= ~bts_cfg.debugctl_mask;
+ if (!child->thread.debugctlmsr)
+ clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
- clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
+ clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
+ }
#endif /* CONFIG_X86_PTRACE_BTS */
}
@@ -1111,9 +1128,16 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
(child, data, (struct ptrace_bts_config __user *)addr);
break;
- case PTRACE_BTS_SIZE:
- ret = ds_get_bts_index(child, /* pos = */ NULL);
+ case PTRACE_BTS_SIZE: {
+ size_t size;
+
+ ret = ds_get_bts_index(child->bts, &size);
+ if (ret == 0) {
+ BUG_ON(size != (int) size);
+ ret = (int) size;
+ }
break;
+ }
case PTRACE_BTS_GET:
ret = ptrace_bts_read_record
@@ -1121,7 +1145,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
break;
case PTRACE_BTS_CLEAR:
- ret = ds_clear_bts(child);
+ ret = ds_clear_bts(child->bts);
break;
case PTRACE_BTS_DRAIN:
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-21 12:52:59 +0000