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ANDROID: binder: fix KMI-break due to address type change

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In commit ("binder: keep vma addresses type as unsigned long") the vma
address type in 'struct binder_alloc' and 'struct binder_buffer' is
changed from 'void __user *' to 'unsigned long'.

This triggers the following KMI issues:

  type 'struct binder_buffer' changed
    member changed from 'void* user_data' to 'unsigned long user_data'
      type changed from 'void*' to 'unsigned long'

  type 'struct binder_alloc' changed
    member changed from 'void* buffer' to 'unsigned long buffer'
      type changed from 'void*' to 'unsigned long'

This offending commit is being backported as part of a larger patchset
from upstream in [1]. Lets fix these issues by doing a partial revert
that restores the original types and casts to an integer type where
necessary.

Note this approach is preferred over dropping the single KMI-breaking
patch from the backport, as this would have created non-trivial merge
conflicts in the subsequent cherry-picks.

Bug: 254650075
Bug: 319778300
Link: https://lore.kernel.org/all/20231201172212.1813387-1-cmllamas@google.com/ [1]
Change-Id: Ief9de717d0f34642f5954ffa2e306075a5b4e02e
Signed-off-by: Carlos Llamas <cmllamas@google.com>
[cmllamas: fixed trivial conflicts]
This commit is contained in:
Carlos Llamas 2023-12-05 02:41:13 +00:00
parent 81054a4507
commit d30de4c7b0
5 changed files with 35 additions and 33 deletions
Download patch file Download diff file Expand all files Collapse all files

19
drivers/android/binder.c
View file

@ -2276,8 +2276,9 @@ static void binder_transaction_buffer_release(struct binder_proc *proc,
* Convert the address to an offset relative to
* the base of the transaction buffer.
*/
fda_offset = parent->buffer - buffer->user_data +
fda->parent_offset;
fda_offset =
(parent->buffer - (uintptr_t)buffer->user_data) +
fda->parent_offset;
for (fd_index = 0; fd_index < fda->num_fds;
fd_index++) {
u32 fd;
@ -2795,7 +2796,7 @@ static int binder_translate_fd_array(struct list_head *pf_head,
* Convert the address to an offset relative to
* the base of the transaction buffer.
*/
fda_offset = parent->buffer - t->buffer->user_data +
fda_offset = (parent->buffer - (uintptr_t)t->buffer->user_data) +
fda->parent_offset;
sender_ufda_base = (void __user *)(uintptr_t)sender_uparent->buffer +
fda->parent_offset;
@ -2870,9 +2871,8 @@ static int binder_fixup_parent(struct list_head *pf_head,
proc->pid, thread->pid);
return -EINVAL;
}
buffer_offset = bp->parent_offset + parent->buffer - b->user_data;
buffer_offset = bp->parent_offset +
(uintptr_t)parent->buffer - (uintptr_t)b->user_data;
return binder_add_fixup(pf_head, buffer_offset, bp->buffer, 0);
}
@ -3473,7 +3473,7 @@ static void binder_transaction(struct binder_proc *proc,
ALIGN(extra_buffers_size, sizeof(void *)) -
ALIGN(secctx_sz, sizeof(u64));
t->security_ctx = t->buffer->user_data + buf_offset;
t->security_ctx = (uintptr_t)t->buffer->user_data + buf_offset;
err = binder_alloc_copy_to_buffer(&target_proc->alloc,
t->buffer, buf_offset,
secctx, secctx_sz);
@ -3751,7 +3751,8 @@ static void binder_transaction(struct binder_proc *proc,
goto err_translate_failed;
}
/* Fixup buffer pointer to target proc address space */
bp->buffer = t->buffer->user_data + sg_buf_offset;
bp->buffer = (uintptr_t)
t->buffer->user_data + sg_buf_offset;
sg_buf_offset += ALIGN(bp->length, sizeof(u64));
num_valid = (buffer_offset - off_start_offset) /
@ -4941,7 +4942,7 @@ skip:
}
trd->data_size = t->buffer->data_size;
trd->offsets_size = t->buffer->offsets_size;
trd->data.ptr.buffer = t->buffer->user_data;
trd->data.ptr.buffer = (uintptr_t)t->buffer->user_data;
trd->data.ptr.offsets = trd->data.ptr.buffer +
ALIGN(t->buffer->data_size,
sizeof(void *));

37
drivers/android/binder_alloc.c
View file

@ -135,9 +135,9 @@ static struct binder_buffer *binder_alloc_prepare_to_free_locked(
buffer = rb_entry(n, struct binder_buffer, rb_node);
BUG_ON(buffer->free);
if (user_ptr < buffer->user_data) {
if (user_ptr < (uintptr_t)buffer->user_data) {
n = n->rb_left;
} else if (user_ptr > buffer->user_data) {
} else if (user_ptr > (uintptr_t)buffer->user_data) {
n = n->rb_right;
} else {
/*
@ -203,7 +203,7 @@ static void binder_lru_freelist_add(struct binder_alloc *alloc,
size_t index;
int ret;
index = (page_addr - alloc->buffer) / PAGE_SIZE;
index = (page_addr - (uintptr_t)alloc->buffer) / PAGE_SIZE;
page = &alloc->pages[index];
if (!binder_get_installed_page(page))
@ -252,7 +252,8 @@ static int binder_install_single_page(struct binder_alloc *alloc,
ret = vm_insert_page(alloc->vma, addr, page);
if (ret) {
pr_err("%d: %s failed to insert page at offset %lx with %d\n",
alloc->pid, __func__, addr - alloc->buffer, ret);
alloc->pid, __func__, addr - (uintptr_t)alloc->buffer,
ret);
__free_page(page);
ret = -ENOMEM;
goto out;
@ -274,14 +275,14 @@ static int binder_install_buffer_pages(struct binder_alloc *alloc,
unsigned long start, final;
unsigned long page_addr;
start = buffer->user_data & PAGE_MASK;
final = PAGE_ALIGN(buffer->user_data + size);
start = (uintptr_t)buffer->user_data & PAGE_MASK;
final = PAGE_ALIGN((uintptr_t)buffer->user_data + size);
for (page_addr = start; page_addr < final; page_addr += PAGE_SIZE) {
unsigned long index;
int ret;
index = (page_addr - alloc->buffer) / PAGE_SIZE;
index = (page_addr - (uintptr_t)alloc->buffer) / PAGE_SIZE;
page = &alloc->pages[index];
if (binder_get_installed_page(page))
@ -312,7 +313,7 @@ static void binder_lru_freelist_del(struct binder_alloc *alloc,
unsigned long index;
bool on_lru;
index = (page_addr - alloc->buffer) / PAGE_SIZE;
index = (page_addr - (uintptr_t)alloc->buffer) / PAGE_SIZE;
page = &alloc->pages[index];
if (page->page_ptr) {
@ -515,9 +516,9 @@ static struct binder_buffer *binder_alloc_new_buf_locked(
* adjacent in-use buffer. In such case, the page has been already
* removed from the freelist so we trim our range short.
*/
next_used_page = (buffer->user_data + buffer_size) & PAGE_MASK;
curr_last_page = PAGE_ALIGN(buffer->user_data + size);
binder_lru_freelist_del(alloc, PAGE_ALIGN(buffer->user_data),
next_used_page = ((uintptr_t)buffer->user_data + buffer_size) & PAGE_MASK;
curr_last_page = PAGE_ALIGN((uintptr_t)buffer->user_data + size);
binder_lru_freelist_del(alloc, PAGE_ALIGN((uintptr_t)buffer->user_data),
min(next_used_page, curr_last_page));
rb_erase(&buffer->rb_node, &alloc->free_buffers);
@ -634,12 +635,12 @@ out:
static unsigned long buffer_start_page(struct binder_buffer *buffer)
{
return buffer->user_data & PAGE_MASK;
return (uintptr_t)buffer->user_data & PAGE_MASK;
}
static unsigned long prev_buffer_end_page(struct binder_buffer *buffer)
{
return (buffer->user_data - 1) & PAGE_MASK;
return ((uintptr_t)buffer->user_data - 1) & PAGE_MASK;
}
static void binder_delete_free_buffer(struct binder_alloc *alloc,
@ -697,8 +698,8 @@ static void binder_free_buf_locked(struct binder_alloc *alloc,
alloc->pid, size, alloc->free_async_space);
}
binder_lru_freelist_add(alloc, PAGE_ALIGN(buffer->user_data),
(buffer->user_data + buffer_size) & PAGE_MASK);
binder_lru_freelist_add(alloc, PAGE_ALIGN((uintptr_t)buffer->user_data),
((uintptr_t)buffer->user_data + buffer_size) & PAGE_MASK);
rb_erase(&buffer->rb_node, &alloc->allocated_buffers);
buffer->free = 1;
@ -847,7 +848,7 @@ int binder_alloc_mmap_handler(struct binder_alloc *alloc,
SZ_4M);
mutex_unlock(&binder_alloc_mmap_lock);
alloc->buffer = vma->vm_start;
alloc->buffer = (void __user *)vma->vm_start;
alloc->pages = kcalloc(alloc->buffer_size / PAGE_SIZE,
sizeof(alloc->pages[0]),
@ -946,7 +947,7 @@ void binder_alloc_deferred_release(struct binder_alloc *alloc)
on_lru = list_lru_del(&binder_freelist,
&alloc->pages[i].lru);
page_addr = alloc->buffer + i * PAGE_SIZE;
page_addr = (uintptr_t)alloc->buffer + i * PAGE_SIZE;
binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
"%s: %d: page %d %s\n",
__func__, alloc->pid, i,
@ -1092,7 +1093,7 @@ enum lru_status binder_alloc_free_page(struct list_head *item,
goto err_page_already_freed;
index = page - alloc->pages;
page_addr = alloc->buffer + index * PAGE_SIZE;
page_addr = (uintptr_t)alloc->buffer + index * PAGE_SIZE;
vma = vma_lookup(mm, page_addr);
if (vma && vma != binder_alloc_get_vma(alloc))

4
drivers/android/binder_alloc.h
View file

@ -54,7 +54,7 @@ struct binder_buffer {
size_t data_size;
size_t offsets_size;
size_t extra_buffers_size;
unsigned long user_data;
void __user *user_data;
int pid;
};
@ -99,7 +99,7 @@ struct binder_alloc {
spinlock_t lock;
struct vm_area_struct *vma;
struct mm_struct *mm;
unsigned long buffer;
void __user *buffer;
struct list_head buffers;
struct rb_root free_buffers;
struct rb_root allocated_buffers;

6
drivers/android/binder_alloc_selftest.c
View file

@ -97,10 +97,10 @@ static bool check_buffer_pages_allocated(struct binder_alloc *alloc,
unsigned long end;
int page_index;
end = PAGE_ALIGN(buffer->user_data + size);
page_addr = buffer->user_data;
end = PAGE_ALIGN((uintptr_t)buffer->user_data + size);
page_addr = (uintptr_t)buffer->user_data;
for (; page_addr < end; page_addr += PAGE_SIZE) {
page_index = (page_addr - alloc->buffer) / PAGE_SIZE;
page_index = (page_addr - (uintptr_t)alloc->buffer) / PAGE_SIZE;
if (!alloc->pages[page_index].page_ptr ||
!list_empty(&alloc->pages[page_index].lru)) {
pr_err("expect alloc but is %s at page index %d\n",

2
drivers/android/binder_trace.h
View file

@ -352,7 +352,7 @@ TRACE_EVENT(binder_update_page_range,
TP_fast_assign(
__entry->proc = alloc->pid;
__entry->allocate = allocate;
__entry->offset = start - alloc->buffer;
__entry->offset = start - (uintptr_t)alloc->buffer;
__entry->size = end - start;
),
TP_printk("proc=%d allocate=%d offset=%zu size=%zu",