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binder: use userspace pointer as base of buffer space

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Now that alloc->buffer points to the userspace vm_area
rename buffer->data to buffer->user_data and rename
local pointers that hold user addresses. Also use the
"__user" tag to annotate all user pointers so sparse
can flag cases where user pointer vaues  are copied to
kernel pointers. Refactor code to use offsets instead
of user pointers.

Signed-off-by: Todd Kjos <tkjos@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Todd Kjos 2019-02-08 10:35:20 -08:00 committed by Greg Kroah-Hartman
parent c41358a5f5
commit bde4a19fc0
5 changed files with 118 additions and 99 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

118
drivers/android/binder.c
View file

@ -2278,33 +2278,30 @@ static void binder_deferred_fd_close(int fd)
static void binder_transaction_buffer_release(struct binder_proc *proc, static void binder_transaction_buffer_release(struct binder_proc *proc,
struct binder_buffer *buffer, struct binder_buffer *buffer,
binder_size_t *failed_at) binder_size_t failed_at,
bool is_failure)
{ {
binder_size_t *offp, *off_start, *off_end;
int debug_id = buffer->debug_id; int debug_id = buffer->debug_id;
binder_size_t off_start_offset; binder_size_t off_start_offset, buffer_offset, off_end_offset;
binder_debug(BINDER_DEBUG_TRANSACTION, binder_debug(BINDER_DEBUG_TRANSACTION,
"%d buffer release %d, size %zd-%zd, failed at %pK\n", "%d buffer release %d, size %zd-%zd, failed at %llx\n",
proc->pid, buffer->debug_id, proc->pid, buffer->debug_id,
buffer->data_size, buffer->offsets_size, failed_at); buffer->data_size, buffer->offsets_size,
(unsigned long long)failed_at);
if (buffer->target_node) if (buffer->target_node)
binder_dec_node(buffer->target_node, 1, 0); binder_dec_node(buffer->target_node, 1, 0);
off_start_offset = ALIGN(buffer->data_size, sizeof(void *)); off_start_offset = ALIGN(buffer->data_size, sizeof(void *));
off_start = (binder_size_t *)(buffer->data + off_start_offset); off_end_offset = is_failure ? failed_at :
if (failed_at) off_start_offset + buffer->offsets_size;
off_end = failed_at; for (buffer_offset = off_start_offset; buffer_offset < off_end_offset;
else buffer_offset += sizeof(binder_size_t)) {
off_end = (void *)off_start + buffer->offsets_size;
for (offp = off_start; offp < off_end; offp++) {
struct binder_object_header *hdr; struct binder_object_header *hdr;
size_t object_size; size_t object_size;
struct binder_object object; struct binder_object object;
binder_size_t object_offset; binder_size_t object_offset;
binder_size_t buffer_offset = (uintptr_t)offp -
(uintptr_t)buffer->data;
binder_alloc_copy_from_buffer(&proc->alloc, &object_offset, binder_alloc_copy_from_buffer(&proc->alloc, &object_offset,
buffer, buffer_offset, buffer, buffer_offset,
@ -2380,9 +2377,10 @@ static void binder_transaction_buffer_release(struct binder_proc *proc,
struct binder_fd_array_object *fda; struct binder_fd_array_object *fda;
struct binder_buffer_object *parent; struct binder_buffer_object *parent;
struct binder_object ptr_object; struct binder_object ptr_object;
u32 *fd_array; binder_size_t fda_offset;
size_t fd_index; size_t fd_index;
binder_size_t fd_buf_size; binder_size_t fd_buf_size;
binder_size_t num_valid;
if (proc->tsk != current->group_leader) { if (proc->tsk != current->group_leader) {
/* /*
@ -2393,12 +2391,14 @@ static void binder_transaction_buffer_release(struct binder_proc *proc,
continue; continue;
} }
num_valid = (buffer_offset - off_start_offset) /
sizeof(binder_size_t);
fda = to_binder_fd_array_object(hdr); fda = to_binder_fd_array_object(hdr);
parent = binder_validate_ptr(proc, buffer, &ptr_object, parent = binder_validate_ptr(proc, buffer, &ptr_object,
fda->parent, fda->parent,
off_start_offset, off_start_offset,
NULL, NULL,
offp - off_start); num_valid);
if (!parent) { if (!parent) {
pr_err("transaction release %d bad parent offset\n", pr_err("transaction release %d bad parent offset\n",
debug_id); debug_id);
@ -2417,14 +2417,21 @@ static void binder_transaction_buffer_release(struct binder_proc *proc,
debug_id, (u64)fda->num_fds); debug_id, (u64)fda->num_fds);
continue; continue;
} }
fd_array = (u32 *)(uintptr_t) /*
(parent->buffer + fda->parent_offset); * the source data for binder_buffer_object is visible
* to user-space and the @buffer element is the user
* pointer to the buffer_object containing the fd_array.
* Convert the address to an offset relative to
* the base of the transaction buffer.
*/
fda_offset =
(parent->buffer - (uintptr_t)buffer->user_data) +
fda->parent_offset;
for (fd_index = 0; fd_index < fda->num_fds; for (fd_index = 0; fd_index < fda->num_fds;
fd_index++) { fd_index++) {
u32 fd; u32 fd;
binder_size_t offset = binder_size_t offset = fda_offset +
(uintptr_t)&fd_array[fd_index] - fd_index * sizeof(fd);
(uintptr_t)buffer->data;
binder_alloc_copy_from_buffer(&proc->alloc, binder_alloc_copy_from_buffer(&proc->alloc,
&fd, &fd,
@ -2638,7 +2645,7 @@ static int binder_translate_fd_array(struct binder_fd_array_object *fda,
struct binder_transaction *in_reply_to) struct binder_transaction *in_reply_to)
{ {
binder_size_t fdi, fd_buf_size; binder_size_t fdi, fd_buf_size;
u32 *fd_array; binder_size_t fda_offset;
struct binder_proc *proc = thread->proc; struct binder_proc *proc = thread->proc;
struct binder_proc *target_proc = t->to_proc; struct binder_proc *target_proc = t->to_proc;
@ -2655,8 +2662,16 @@ static int binder_translate_fd_array(struct binder_fd_array_object *fda,
proc->pid, thread->pid, (u64)fda->num_fds); proc->pid, thread->pid, (u64)fda->num_fds);
return -EINVAL; return -EINVAL;
} }
fd_array = (u32 *)(uintptr_t)(parent->buffer + fda->parent_offset); /*
if (!IS_ALIGNED((unsigned long)fd_array, sizeof(u32))) { * the source data for binder_buffer_object is visible
* to user-space and the @buffer element is the user
* pointer to the buffer_object containing the fd_array.
* Convert the address to an offset relative to
* the base of the transaction buffer.
*/
fda_offset = (parent->buffer - (uintptr_t)t->buffer->user_data) +
fda->parent_offset;
if (!IS_ALIGNED((unsigned long)fda_offset, sizeof(u32))) {
binder_user_error("%d:%d parent offset not aligned correctly.\n", binder_user_error("%d:%d parent offset not aligned correctly.\n",
proc->pid, thread->pid); proc->pid, thread->pid);
return -EINVAL; return -EINVAL;
@ -2664,9 +2679,7 @@ static int binder_translate_fd_array(struct binder_fd_array_object *fda,
for (fdi = 0; fdi < fda->num_fds; fdi++) { for (fdi = 0; fdi < fda->num_fds; fdi++) {
u32 fd; u32 fd;
int ret; int ret;
binder_size_t offset = binder_size_t offset = fda_offset + fdi * sizeof(fd);
(uintptr_t)&fd_array[fdi] -
(uintptr_t)t->buffer->data;
binder_alloc_copy_from_buffer(&target_proc->alloc, binder_alloc_copy_from_buffer(&target_proc->alloc,
&fd, t->buffer, &fd, t->buffer,
@ -2724,7 +2737,7 @@ static int binder_fixup_parent(struct binder_transaction *t,
return -EINVAL; return -EINVAL;
} }
buffer_offset = bp->parent_offset + buffer_offset = bp->parent_offset +
(uintptr_t)parent->buffer - (uintptr_t)b->data; (uintptr_t)parent->buffer - (uintptr_t)b->user_data;
binder_alloc_copy_to_buffer(&target_proc->alloc, b, buffer_offset, binder_alloc_copy_to_buffer(&target_proc->alloc, b, buffer_offset,
&bp->buffer, sizeof(bp->buffer)); &bp->buffer, sizeof(bp->buffer));
@ -2845,10 +2858,10 @@ static void binder_transaction(struct binder_proc *proc,
struct binder_transaction *t; struct binder_transaction *t;
struct binder_work *w; struct binder_work *w;
struct binder_work *tcomplete; struct binder_work *tcomplete;
binder_size_t *offp, *off_end, *off_start; binder_size_t buffer_offset = 0;
binder_size_t off_start_offset; binder_size_t off_start_offset, off_end_offset;
binder_size_t off_min; binder_size_t off_min;
u8 *sg_bufp, *sg_buf_end; binder_size_t sg_buf_offset, sg_buf_end_offset;
struct binder_proc *target_proc = NULL; struct binder_proc *target_proc = NULL;
struct binder_thread *target_thread = NULL; struct binder_thread *target_thread = NULL;
struct binder_node *target_node = NULL; struct binder_node *target_node = NULL;
@ -3141,7 +3154,7 @@ static void binder_transaction(struct binder_proc *proc,
ALIGN(extra_buffers_size, sizeof(void *)) - ALIGN(extra_buffers_size, sizeof(void *)) -
ALIGN(secctx_sz, sizeof(u64)); ALIGN(secctx_sz, sizeof(u64));
t->security_ctx = (uintptr_t)t->buffer->data + buf_offset; t->security_ctx = (uintptr_t)t->buffer->user_data + buf_offset;
binder_alloc_copy_to_buffer(&target_proc->alloc, binder_alloc_copy_to_buffer(&target_proc->alloc,
t->buffer, buf_offset, t->buffer, buf_offset,
secctx, secctx_sz); secctx, secctx_sz);
@ -3152,9 +3165,6 @@ static void binder_transaction(struct binder_proc *proc,
t->buffer->transaction = t; t->buffer->transaction = t;
t->buffer->target_node = target_node; t->buffer->target_node = target_node;
trace_binder_transaction_alloc_buf(t->buffer); trace_binder_transaction_alloc_buf(t->buffer);
off_start_offset = ALIGN(tr->data_size, sizeof(void *));
off_start = (binder_size_t *)(t->buffer->data + off_start_offset);
offp = off_start;
if (binder_alloc_copy_user_to_buffer( if (binder_alloc_copy_user_to_buffer(
&target_proc->alloc, &target_proc->alloc,
@ -3200,17 +3210,18 @@ static void binder_transaction(struct binder_proc *proc,
return_error_line = __LINE__; return_error_line = __LINE__;
goto err_bad_offset; goto err_bad_offset;
} }
off_end = (void *)off_start + tr->offsets_size; off_start_offset = ALIGN(tr->data_size, sizeof(void *));
sg_bufp = (u8 *)(PTR_ALIGN(off_end, sizeof(void *))); buffer_offset = off_start_offset;
sg_buf_end = sg_bufp + extra_buffers_size; off_end_offset = off_start_offset + tr->offsets_size;
sg_buf_offset = ALIGN(off_end_offset, sizeof(void *));
sg_buf_end_offset = sg_buf_offset + extra_buffers_size;
off_min = 0; off_min = 0;
for (; offp < off_end; offp++) { for (buffer_offset = off_start_offset; buffer_offset < off_end_offset;
buffer_offset += sizeof(binder_size_t)) {
struct binder_object_header *hdr; struct binder_object_header *hdr;
size_t object_size; size_t object_size;
struct binder_object object; struct binder_object object;
binder_size_t object_offset; binder_size_t object_offset;
binder_size_t buffer_offset =
(uintptr_t)offp - (uintptr_t)t->buffer->data;
binder_alloc_copy_from_buffer(&target_proc->alloc, binder_alloc_copy_from_buffer(&target_proc->alloc,
&object_offset, &object_offset,
@ -3290,12 +3301,14 @@ static void binder_transaction(struct binder_proc *proc,
binder_size_t parent_offset; binder_size_t parent_offset;
struct binder_fd_array_object *fda = struct binder_fd_array_object *fda =
to_binder_fd_array_object(hdr); to_binder_fd_array_object(hdr);
size_t num_valid = (buffer_offset - off_start_offset) *
sizeof(binder_size_t);
struct binder_buffer_object *parent = struct binder_buffer_object *parent =
binder_validate_ptr(target_proc, t->buffer, binder_validate_ptr(target_proc, t->buffer,
&ptr_object, fda->parent, &ptr_object, fda->parent,
off_start_offset, off_start_offset,
&parent_offset, &parent_offset,
offp - off_start); num_valid);
if (!parent) { if (!parent) {
binder_user_error("%d:%d got transaction with invalid parent offset or type\n", binder_user_error("%d:%d got transaction with invalid parent offset or type\n",
proc->pid, thread->pid); proc->pid, thread->pid);
@ -3332,9 +3345,8 @@ static void binder_transaction(struct binder_proc *proc,
case BINDER_TYPE_PTR: { case BINDER_TYPE_PTR: {
struct binder_buffer_object *bp = struct binder_buffer_object *bp =
to_binder_buffer_object(hdr); to_binder_buffer_object(hdr);
size_t buf_left = sg_buf_end - sg_bufp; size_t buf_left = sg_buf_end_offset - sg_buf_offset;
binder_size_t sg_buf_offset = (uintptr_t)sg_bufp - size_t num_valid;
(uintptr_t)t->buffer->data;
if (bp->length > buf_left) { if (bp->length > buf_left) {
binder_user_error("%d:%d got transaction with too large buffer\n", binder_user_error("%d:%d got transaction with too large buffer\n",
@ -3359,12 +3371,15 @@ static void binder_transaction(struct binder_proc *proc,
goto err_copy_data_failed; goto err_copy_data_failed;
} }
/* Fixup buffer pointer to target proc address space */ /* Fixup buffer pointer to target proc address space */
bp->buffer = (uintptr_t)sg_bufp; bp->buffer = (uintptr_t)
sg_bufp += ALIGN(bp->length, sizeof(u64)); t->buffer->user_data + sg_buf_offset;
sg_buf_offset += ALIGN(bp->length, sizeof(u64));
num_valid = (buffer_offset - off_start_offset) *
sizeof(binder_size_t);
ret = binder_fixup_parent(t, thread, bp, ret = binder_fixup_parent(t, thread, bp,
off_start_offset, off_start_offset,
offp - off_start, num_valid,
last_fixup_obj_off, last_fixup_obj_off,
last_fixup_min_off); last_fixup_min_off);
if (ret < 0) { if (ret < 0) {
@ -3456,7 +3471,8 @@ static void binder_transaction(struct binder_proc *proc,
err_copy_data_failed: err_copy_data_failed:
binder_free_txn_fixups(t); binder_free_txn_fixups(t);
trace_binder_transaction_failed_buffer_release(t->buffer); trace_binder_transaction_failed_buffer_release(t->buffer);
binder_transaction_buffer_release(target_proc, t->buffer, offp); binder_transaction_buffer_release(target_proc, t->buffer,
buffer_offset, true);
if (target_node) if (target_node)
binder_dec_node_tmpref(target_node); binder_dec_node_tmpref(target_node);
target_node = NULL; target_node = NULL;
@ -3557,7 +3573,7 @@ binder_free_buf(struct binder_proc *proc, struct binder_buffer *buffer)
binder_node_inner_unlock(buf_node); binder_node_inner_unlock(buf_node);
} }
trace_binder_transaction_buffer_release(buffer); trace_binder_transaction_buffer_release(buffer);
binder_transaction_buffer_release(proc, buffer, NULL); binder_transaction_buffer_release(proc, buffer, 0, false);
binder_alloc_free_buf(&proc->alloc, buffer); binder_alloc_free_buf(&proc->alloc, buffer);
} }
@ -4451,7 +4467,7 @@ static int binder_thread_read(struct binder_proc *proc,
} }
trd->data_size = t->buffer->data_size; trd->data_size = t->buffer->data_size;
trd->offsets_size = t->buffer->offsets_size; trd->offsets_size = t->buffer->offsets_size;
trd->data.ptr.buffer = (uintptr_t)t->buffer->data; trd->data.ptr.buffer = (uintptr_t)t->buffer->user_data;
trd->data.ptr.offsets = trd->data.ptr.buffer + trd->data.ptr.offsets = trd->data.ptr.buffer +
ALIGN(t->buffer->data_size, ALIGN(t->buffer->data_size,
sizeof(void *)); sizeof(void *));
@ -5489,7 +5505,7 @@ static void print_binder_transaction_ilocked(struct seq_file *m,
seq_printf(m, " node %d", buffer->target_node->debug_id); seq_printf(m, " node %d", buffer->target_node->debug_id);
seq_printf(m, " size %zd:%zd data %pK\n", seq_printf(m, " size %zd:%zd data %pK\n",
buffer->data_size, buffer->offsets_size, buffer->data_size, buffer->offsets_size,
buffer->data); buffer->user_data);
} }
static void print_binder_work_ilocked(struct seq_file *m, static void print_binder_work_ilocked(struct seq_file *m,

87
drivers/android/binder_alloc.c
View file

@ -69,9 +69,8 @@ static size_t binder_alloc_buffer_size(struct binder_alloc *alloc,
struct binder_buffer *buffer) struct binder_buffer *buffer)
{ {
if (list_is_last(&buffer->entry, &alloc->buffers)) if (list_is_last(&buffer->entry, &alloc->buffers))
return (u8 *)alloc->buffer + return alloc->buffer + alloc->buffer_size - buffer->user_data;
alloc->buffer_size - (u8 *)buffer->data; return binder_buffer_next(buffer)->user_data - buffer->user_data;
return (u8 *)binder_buffer_next(buffer)->data - (u8 *)buffer->data;
} }
static void binder_insert_free_buffer(struct binder_alloc *alloc, static void binder_insert_free_buffer(struct binder_alloc *alloc,
@ -121,9 +120,9 @@ static void binder_insert_allocated_buffer_locked(
buffer = rb_entry(parent, struct binder_buffer, rb_node); buffer = rb_entry(parent, struct binder_buffer, rb_node);
BUG_ON(buffer->free); BUG_ON(buffer->free);
if (new_buffer->data < buffer->data) if (new_buffer->user_data < buffer->user_data)
p = &parent->rb_left; p = &parent->rb_left;
else if (new_buffer->data > buffer->data) else if (new_buffer->user_data > buffer->user_data)
p = &parent->rb_right; p = &parent->rb_right;
else else
BUG(); BUG();
@ -138,17 +137,17 @@ static struct binder_buffer *binder_alloc_prepare_to_free_locked(
{ {
struct rb_node *n = alloc->allocated_buffers.rb_node; struct rb_node *n = alloc->allocated_buffers.rb_node;
struct binder_buffer *buffer; struct binder_buffer *buffer;
void *uptr; void __user *uptr;
uptr = (void *)user_ptr; uptr = (void __user *)user_ptr;
while (n) { while (n) {
buffer = rb_entry(n, struct binder_buffer, rb_node); buffer = rb_entry(n, struct binder_buffer, rb_node);
BUG_ON(buffer->free); BUG_ON(buffer->free);
if (uptr < buffer->data) if (uptr < buffer->user_data)
n = n->rb_left; n = n->rb_left;
else if (uptr > buffer->data) else if (uptr > buffer->user_data)
n = n->rb_right; n = n->rb_right;
else { else {
/* /*
@ -188,9 +187,9 @@ struct binder_buffer *binder_alloc_prepare_to_free(struct binder_alloc *alloc,
} }
static int binder_update_page_range(struct binder_alloc *alloc, int allocate, static int binder_update_page_range(struct binder_alloc *alloc, int allocate,
void *start, void *end) void __user *start, void __user *end)
{ {
void *page_addr; void __user *page_addr;
unsigned long user_page_addr; unsigned long user_page_addr;
struct binder_lru_page *page; struct binder_lru_page *page;
struct vm_area_struct *vma = NULL; struct vm_area_struct *vma = NULL;
@ -357,8 +356,8 @@ static struct binder_buffer *binder_alloc_new_buf_locked(
struct binder_buffer *buffer; struct binder_buffer *buffer;
size_t buffer_size; size_t buffer_size;
struct rb_node *best_fit = NULL; struct rb_node *best_fit = NULL;
void *has_page_addr; void __user *has_page_addr;
void *end_page_addr; void __user *end_page_addr;
size_t size, data_offsets_size; size_t size, data_offsets_size;
int ret; int ret;
@ -456,15 +455,15 @@ static struct binder_buffer *binder_alloc_new_buf_locked(
"%d: binder_alloc_buf size %zd got buffer %pK size %zd\n", "%d: binder_alloc_buf size %zd got buffer %pK size %zd\n",
alloc->pid, size, buffer, buffer_size); alloc->pid, size, buffer, buffer_size);
has_page_addr = has_page_addr = (void __user *)
(void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK); (((uintptr_t)buffer->user_data + buffer_size) & PAGE_MASK);
WARN_ON(n && buffer_size != size); WARN_ON(n && buffer_size != size);
end_page_addr = end_page_addr =
(void *)PAGE_ALIGN((uintptr_t)buffer->data + size); (void __user *)PAGE_ALIGN((uintptr_t)buffer->user_data + size);
if (end_page_addr > has_page_addr) if (end_page_addr > has_page_addr)
end_page_addr = has_page_addr; end_page_addr = has_page_addr;
ret = binder_update_page_range(alloc, 1, ret = binder_update_page_range(alloc, 1, (void __user *)
(void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr); PAGE_ALIGN((uintptr_t)buffer->user_data), end_page_addr);
if (ret) if (ret)
return ERR_PTR(ret); return ERR_PTR(ret);
@ -477,7 +476,7 @@ static struct binder_buffer *binder_alloc_new_buf_locked(
__func__, alloc->pid); __func__, alloc->pid);
goto err_alloc_buf_struct_failed; goto err_alloc_buf_struct_failed;
} }
new_buffer->data = (u8 *)buffer->data + size; new_buffer->user_data = (u8 __user *)buffer->user_data + size;
list_add(&new_buffer->entry, &buffer->entry); list_add(&new_buffer->entry, &buffer->entry);
new_buffer->free = 1; new_buffer->free = 1;
binder_insert_free_buffer(alloc, new_buffer); binder_insert_free_buffer(alloc, new_buffer);
@ -503,8 +502,8 @@ static struct binder_buffer *binder_alloc_new_buf_locked(
return buffer; return buffer;
err_alloc_buf_struct_failed: err_alloc_buf_struct_failed:
binder_update_page_range(alloc, 0, binder_update_page_range(alloc, 0, (void __user *)
(void *)PAGE_ALIGN((uintptr_t)buffer->data), PAGE_ALIGN((uintptr_t)buffer->user_data),
end_page_addr); end_page_addr);
return ERR_PTR(-ENOMEM); return ERR_PTR(-ENOMEM);
} }
@ -539,14 +538,15 @@ struct binder_buffer *binder_alloc_new_buf(struct binder_alloc *alloc,
return buffer; return buffer;
} }
static void *buffer_start_page(struct binder_buffer *buffer) static void __user *buffer_start_page(struct binder_buffer *buffer)
{ {
return (void *)((uintptr_t)buffer->data & PAGE_MASK); return (void __user *)((uintptr_t)buffer->user_data & PAGE_MASK);
} }
static void *prev_buffer_end_page(struct binder_buffer *buffer) static void __user *prev_buffer_end_page(struct binder_buffer *buffer)
{ {
return (void *)(((uintptr_t)(buffer->data) - 1) & PAGE_MASK); return (void __user *)
(((uintptr_t)(buffer->user_data) - 1) & PAGE_MASK);
} }
static void binder_delete_free_buffer(struct binder_alloc *alloc, static void binder_delete_free_buffer(struct binder_alloc *alloc,
@ -561,7 +561,8 @@ static void binder_delete_free_buffer(struct binder_alloc *alloc,
to_free = false; to_free = false;
binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC, binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
"%d: merge free, buffer %pK share page with %pK\n", "%d: merge free, buffer %pK share page with %pK\n",
alloc->pid, buffer->data, prev->data); alloc->pid, buffer->user_data,
prev->user_data);
} }
if (!list_is_last(&buffer->entry, &alloc->buffers)) { if (!list_is_last(&buffer->entry, &alloc->buffers)) {
@ -571,23 +572,24 @@ static void binder_delete_free_buffer(struct binder_alloc *alloc,
binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC, binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
"%d: merge free, buffer %pK share page with %pK\n", "%d: merge free, buffer %pK share page with %pK\n",
alloc->pid, alloc->pid,
buffer->data, buffer->user_data,
next->data); next->user_data);
} }
} }
if (PAGE_ALIGNED(buffer->data)) { if (PAGE_ALIGNED(buffer->user_data)) {
binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC, binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
"%d: merge free, buffer start %pK is page aligned\n", "%d: merge free, buffer start %pK is page aligned\n",
alloc->pid, buffer->data); alloc->pid, buffer->user_data);
to_free = false; to_free = false;
} }
if (to_free) { if (to_free) {
binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC, binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
"%d: merge free, buffer %pK do not share page with %pK or %pK\n", "%d: merge free, buffer %pK do not share page with %pK or %pK\n",
alloc->pid, buffer->data, alloc->pid, buffer->user_data,
prev->data, next ? next->data : NULL); prev->user_data,
next ? next->user_data : NULL);
binder_update_page_range(alloc, 0, buffer_start_page(buffer), binder_update_page_range(alloc, 0, buffer_start_page(buffer),
buffer_start_page(buffer) + PAGE_SIZE); buffer_start_page(buffer) + PAGE_SIZE);
} }
@ -613,8 +615,8 @@ static void binder_free_buf_locked(struct binder_alloc *alloc,
BUG_ON(buffer->free); BUG_ON(buffer->free);
BUG_ON(size > buffer_size); BUG_ON(size > buffer_size);
BUG_ON(buffer->transaction != NULL); BUG_ON(buffer->transaction != NULL);
BUG_ON(buffer->data < alloc->buffer); BUG_ON(buffer->user_data < alloc->buffer);
BUG_ON(buffer->data > alloc->buffer + alloc->buffer_size); BUG_ON(buffer->user_data > alloc->buffer + alloc->buffer_size);
if (buffer->async_transaction) { if (buffer->async_transaction) {
alloc->free_async_space += size + sizeof(struct binder_buffer); alloc->free_async_space += size + sizeof(struct binder_buffer);
@ -625,8 +627,9 @@ static void binder_free_buf_locked(struct binder_alloc *alloc,
} }
binder_update_page_range(alloc, 0, binder_update_page_range(alloc, 0,
(void *)PAGE_ALIGN((uintptr_t)buffer->data), (void __user *)PAGE_ALIGN((uintptr_t)buffer->user_data),
(void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK)); (void __user *)(((uintptr_t)
buffer->user_data + buffer_size) & PAGE_MASK));
rb_erase(&buffer->rb_node, &alloc->allocated_buffers); rb_erase(&buffer->rb_node, &alloc->allocated_buffers);
buffer->free = 1; buffer->free = 1;
@ -692,7 +695,7 @@ int binder_alloc_mmap_handler(struct binder_alloc *alloc,
goto err_already_mapped; goto err_already_mapped;
} }
alloc->buffer = (void *)vma->vm_start; alloc->buffer = (void __user *)vma->vm_start;
mutex_unlock(&binder_alloc_mmap_lock); mutex_unlock(&binder_alloc_mmap_lock);
alloc->pages = kcalloc((vma->vm_end - vma->vm_start) / PAGE_SIZE, alloc->pages = kcalloc((vma->vm_end - vma->vm_start) / PAGE_SIZE,
@ -712,7 +715,7 @@ int binder_alloc_mmap_handler(struct binder_alloc *alloc,
goto err_alloc_buf_struct_failed; goto err_alloc_buf_struct_failed;
} }
buffer->data = alloc->buffer; buffer->user_data = alloc->buffer;
list_add(&buffer->entry, &alloc->buffers); list_add(&buffer->entry, &alloc->buffers);
buffer->free = 1; buffer->free = 1;
binder_insert_free_buffer(alloc, buffer); binder_insert_free_buffer(alloc, buffer);
@ -773,7 +776,7 @@ void binder_alloc_deferred_release(struct binder_alloc *alloc)
int i; int i;
for (i = 0; i < alloc->buffer_size / PAGE_SIZE; i++) { for (i = 0; i < alloc->buffer_size / PAGE_SIZE; i++) {
void *page_addr; void __user *page_addr;
bool on_lru; bool on_lru;
if (!alloc->pages[i].page_ptr) if (!alloc->pages[i].page_ptr)
@ -804,7 +807,7 @@ static void print_binder_buffer(struct seq_file *m, const char *prefix,
struct binder_buffer *buffer) struct binder_buffer *buffer)
{ {
seq_printf(m, "%s %d: %pK size %zd:%zd:%zd %s\n", seq_printf(m, "%s %d: %pK size %zd:%zd:%zd %s\n",
prefix, buffer->debug_id, buffer->data, prefix, buffer->debug_id, buffer->user_data,
buffer->data_size, buffer->offsets_size, buffer->data_size, buffer->offsets_size,
buffer->extra_buffers_size, buffer->extra_buffers_size,
buffer->transaction ? "active" : "delivered"); buffer->transaction ? "active" : "delivered");
@ -1056,7 +1059,7 @@ static inline bool check_buffer(struct binder_alloc *alloc,
* @pgoffp: address to copy final page offset to * @pgoffp: address to copy final page offset to
* *
* Lookup the struct page corresponding to the address * Lookup the struct page corresponding to the address
* at @buffer_offset into @buffer->data. If @pgoffp is not * at @buffer_offset into @buffer->user_data. If @pgoffp is not
* NULL, the byte-offset into the page is written there. * NULL, the byte-offset into the page is written there.
* *
* The caller is responsible to ensure that the offset points * The caller is responsible to ensure that the offset points
@ -1073,7 +1076,7 @@ static struct page *binder_alloc_get_page(struct binder_alloc *alloc,
pgoff_t *pgoffp) pgoff_t *pgoffp)
{ {
binder_size_t buffer_space_offset = buffer_offset + binder_size_t buffer_space_offset = buffer_offset +
(buffer->data - alloc->buffer); (buffer->user_data - alloc->buffer);
pgoff_t pgoff = buffer_space_offset & ~PAGE_MASK; pgoff_t pgoff = buffer_space_offset & ~PAGE_MASK;
size_t index = buffer_space_offset >> PAGE_SHIFT; size_t index = buffer_space_offset >> PAGE_SHIFT;
struct binder_lru_page *lru_page; struct binder_lru_page *lru_page;

6
drivers/android/binder_alloc.h
View file

@ -40,7 +40,7 @@ struct binder_transaction;
* @data_size: size of @transaction data * @data_size: size of @transaction data
* @offsets_size: size of array of offsets * @offsets_size: size of array of offsets
* @extra_buffers_size: size of space for other objects (like sg lists) * @extra_buffers_size: size of space for other objects (like sg lists)
* @data: pointer to base of buffer space * @user_data: user pointer to base of buffer space
* *
* Bookkeeping structure for binder transaction buffers * Bookkeeping structure for binder transaction buffers
*/ */
@ -59,7 +59,7 @@ struct binder_buffer {
size_t data_size; size_t data_size;
size_t offsets_size; size_t offsets_size;
size_t extra_buffers_size; size_t extra_buffers_size;
void *data; void __user *user_data;
}; };
/** /**
@ -102,7 +102,7 @@ struct binder_alloc {
struct mutex mutex; struct mutex mutex;
struct vm_area_struct *vma; struct vm_area_struct *vma;
struct mm_struct *vma_vm_mm; struct mm_struct *vma_vm_mm;
void *buffer; void __user *buffer;
struct list_head buffers; struct list_head buffers;
struct rb_root free_buffers; struct rb_root free_buffers;
struct rb_root allocated_buffers; struct rb_root allocated_buffers;

4
drivers/android/binder_alloc_selftest.c
View file

@ -105,8 +105,8 @@ static bool check_buffer_pages_allocated(struct binder_alloc *alloc,
void *page_addr, *end; void *page_addr, *end;
int page_index; int page_index;
end = (void *)PAGE_ALIGN((uintptr_t)buffer->data + size); end = (void *)PAGE_ALIGN((uintptr_t)buffer->user_data + size);
page_addr = buffer->data; page_addr = buffer->user_data;
for (; page_addr < end; page_addr += PAGE_SIZE) { for (; page_addr < end; page_addr += PAGE_SIZE) {
page_index = (page_addr - alloc->buffer) / PAGE_SIZE; page_index = (page_addr - alloc->buffer) / PAGE_SIZE;
if (!alloc->pages[page_index].page_ptr || if (!alloc->pages[page_index].page_ptr ||

2
drivers/android/binder_trace.h
View file

@ -293,7 +293,7 @@ DEFINE_EVENT(binder_buffer_class, binder_transaction_failed_buffer_release,
TRACE_EVENT(binder_update_page_range, TRACE_EVENT(binder_update_page_range,
TP_PROTO(struct binder_alloc *alloc, bool allocate, TP_PROTO(struct binder_alloc *alloc, bool allocate,
void *start, void *end), void __user *start, void __user *end),
TP_ARGS(alloc, allocate, start, end), TP_ARGS(alloc, allocate, start, end),
TP_STRUCT__entry( TP_STRUCT__entry(
__field(int, proc) __field(int, proc)