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Subject[PATCH 2/5] i915: switch copy_perf_config_registers_or_number() to unsafe_put_user()
Date
From: Al Viro <viro@zeniv.linux.org.uk>

... and the rest of query_perf_config_data() to normal uaccess primitives

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
drivers/gpu/drm/i915/i915_query.c | 46 ++++++++++++++-------------------------
drivers/gpu/drm/i915/i915_reg.h | 2 +-
2 files changed, 17 insertions(+), 31 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_query.c b/drivers/gpu/drm/i915/i915_query.c
index ad8e55fe1e59..e75c528ebbe0 100644
--- a/drivers/gpu/drm/i915/i915_query.c
+++ b/drivers/gpu/drm/i915/i915_query.c
@@ -154,10 +154,6 @@ static int can_copy_perf_config_registers_or_number(u32 user_n_regs,
if (user_n_regs < kernel_n_regs)
return -EINVAL;

- if (!access_ok(u64_to_user_ptr(user_regs_ptr),
- 2 * sizeof(u32) * kernel_n_regs))
- return -EFAULT;
-
return 0;
}

@@ -166,6 +162,7 @@ static int copy_perf_config_registers_or_number(const struct i915_oa_reg *kernel
u64 user_regs_ptr,
u32 *user_n_regs)
{
+ u32 __user *p = u64_to_user_ptr(user_regs_ptr);
u32 r;

if (*user_n_regs == 0) {
@@ -175,25 +172,19 @@ static int copy_perf_config_registers_or_number(const struct i915_oa_reg *kernel

*user_n_regs = kernel_n_regs;

- for (r = 0; r < kernel_n_regs; r++) {
- u32 __user *user_reg_ptr =
- u64_to_user_ptr(user_regs_ptr + sizeof(u32) * r * 2);
- u32 __user *user_val_ptr =
- u64_to_user_ptr(user_regs_ptr + sizeof(u32) * r * 2 +
- sizeof(u32));
- int ret;
-
- ret = __put_user(i915_mmio_reg_offset(kernel_regs[r].addr),
- user_reg_ptr);
- if (ret)
- return -EFAULT;
+ if (!user_write_access_begin(p, 2 * sizeof(u32) * kernel_n_regs))
+ return -EFAULT;

- ret = __put_user(kernel_regs[r].value, user_val_ptr);
- if (ret)
- return -EFAULT;
+ for (r = 0; r < kernel_n_regs; r++, p += 2) {
+ unsafe_put_user(i915_mmio_reg_offset(kernel_regs[r].addr),
+ p, Efault);
+ unsafe_put_user(kernel_regs[r].value, p + 1, Efault);
}
-
+ user_write_access_end();
return 0;
+Efault:
+ user_write_access_end();
+ return -EFAULT;
}

static int query_perf_config_data(struct drm_i915_private *i915,
@@ -229,10 +220,7 @@ static int query_perf_config_data(struct drm_i915_private *i915,
return -EINVAL;
}

- if (!access_ok(user_query_config_ptr, total_size))
- return -EFAULT;
-
- if (__get_user(flags, &user_query_config_ptr->flags))
+ if (get_user(flags, &user_query_config_ptr->flags))
return -EFAULT;

if (flags != 0)
@@ -245,7 +233,7 @@ static int query_perf_config_data(struct drm_i915_private *i915,
BUILD_BUG_ON(sizeof(user_query_config_ptr->uuid) >= sizeof(uuid));

memset(&uuid, 0, sizeof(uuid));
- if (__copy_from_user(uuid, user_query_config_ptr->uuid,
+ if (copy_from_user(uuid, user_query_config_ptr->uuid,
sizeof(user_query_config_ptr->uuid)))
return -EFAULT;

@@ -259,7 +247,7 @@ static int query_perf_config_data(struct drm_i915_private *i915,
}
rcu_read_unlock();
} else {
- if (__get_user(config_id, &user_query_config_ptr->config))
+ if (get_user(config_id, &user_query_config_ptr->config))
return -EFAULT;

oa_config = i915_perf_get_oa_config(perf, config_id);
@@ -267,8 +255,7 @@ static int query_perf_config_data(struct drm_i915_private *i915,
if (!oa_config)
return -ENOENT;

- if (__copy_from_user(&user_config, user_config_ptr,
- sizeof(user_config))) {
+ if (copy_from_user(&user_config, user_config_ptr, sizeof(user_config))) {
ret = -EFAULT;
goto out;
}
@@ -314,8 +301,7 @@ static int query_perf_config_data(struct drm_i915_private *i915,

memcpy(user_config.uuid, oa_config->uuid, sizeof(user_config.uuid));

- if (__copy_to_user(user_config_ptr, &user_config,
- sizeof(user_config))) {
+ if (copy_to_user(user_config_ptr, &user_config, sizeof(user_config))) {
ret = -EFAULT;
goto out;
}
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 59e64acc2c56..3733b9e20976 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -186,7 +186,7 @@ typedef struct {

#define INVALID_MMIO_REG _MMIO(0)

-static inline u32 i915_mmio_reg_offset(i915_reg_t reg)
+static __always_inline u32 i915_mmio_reg_offset(i915_reg_t reg)
{
return reg.reg;
}
--
2.11.0
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