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authorJann Horn <jannh@google.com>2019-10-16 17:01:18 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-10-17 05:58:44 -0700
commit45d02f79b539073b76077836871de6b674e36eb4 (patch)
treeff505d460ace78810d7dcf93084d32d2d830d409 /drivers/android
parent4f5cafb5cb8471e54afdc9054d973535614f7675 (diff)
binder: Don't modify VMA bounds in ->mmap handler
binder_mmap() tries to prevent the creation of overly big binder mappings by silently truncating the size of the VMA to 4MiB. However, this violates the API contract of mmap(). If userspace attempts to create a large binder VMA, and later attempts to unmap that VMA, it will call munmap() on a range beyond the end of the VMA, which may have been allocated to another VMA in the meantime. This can lead to userspace memory corruption. The following sequence of calls leads to a segfault without this commit: int main(void) { int binder_fd = open("/dev/binder", O_RDWR); if (binder_fd == -1) err(1, "open binder"); void *binder_mapping = mmap(NULL, 0x800000UL, PROT_READ, MAP_SHARED, binder_fd, 0); if (binder_mapping == MAP_FAILED) err(1, "mmap binder"); void *data_mapping = mmap(NULL, 0x400000UL, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); if (data_mapping == MAP_FAILED) err(1, "mmap data"); munmap(binder_mapping, 0x800000UL); *(char*)data_mapping = 1; return 0; } Cc: stable@vger.kernel.org Signed-off-by: Jann Horn <jannh@google.com> Acked-by: Todd Kjos <tkjos@google.com> Acked-by: Christian Brauner <christian.brauner@ubuntu.com> Link: https://lore.kernel.org/r/20191016150119.154756-1-jannh@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/android')
-rw-r--r--drivers/android/binder.c7
-rw-r--r--drivers/android/binder_alloc.c6
2 files changed, 4 insertions, 9 deletions
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 5b9ac2122e89..265d9dd46a5e 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -97,10 +97,6 @@ DEFINE_SHOW_ATTRIBUTE(proc);
#define SZ_1K 0x400
#endif
-#ifndef SZ_4M
-#define SZ_4M 0x400000
-#endif
-
#define FORBIDDEN_MMAP_FLAGS (VM_WRITE)
enum {
@@ -5177,9 +5173,6 @@ static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
if (proc->tsk != current->group_leader)
return -EINVAL;
- if ((vma->vm_end - vma->vm_start) > SZ_4M)
- vma->vm_end = vma->vm_start + SZ_4M;
-
binder_debug(BINDER_DEBUG_OPEN_CLOSE,
"%s: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
__func__, proc->pid, vma->vm_start, vma->vm_end,
diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c
index d42a8b2f636a..eb76a823fbb2 100644
--- a/drivers/android/binder_alloc.c
+++ b/drivers/android/binder_alloc.c
@@ -22,6 +22,7 @@
#include <asm/cacheflush.h>
#include <linux/uaccess.h>
#include <linux/highmem.h>
+#include <linux/sizes.h>
#include "binder_alloc.h"
#include "binder_trace.h"
@@ -689,7 +690,9 @@ int binder_alloc_mmap_handler(struct binder_alloc *alloc,
alloc->buffer = (void __user *)vma->vm_start;
mutex_unlock(&binder_alloc_mmap_lock);
- alloc->pages = kcalloc((vma->vm_end - vma->vm_start) / PAGE_SIZE,
+ alloc->buffer_size = min_t(unsigned long, vma->vm_end - vma->vm_start,
+ SZ_4M);
+ alloc->pages = kcalloc(alloc->buffer_size / PAGE_SIZE,
sizeof(alloc->pages[0]),
GFP_KERNEL);
if (alloc->pages == NULL) {
@@ -697,7 +700,6 @@ int binder_alloc_mmap_handler(struct binder_alloc *alloc,
failure_string = "alloc page array";
goto err_alloc_pages_failed;
}
- alloc->buffer_size = vma->vm_end - vma->vm_start;
buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
if (!buffer) {