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Merge branch 'work.memdup_user' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Browse Source 
Pull memdup_user() conversions from Al Viro:
 "A fairly self-contained series - hunting down open-coded memdup_user()
  and memdup_user_nul() instances"

* 'work.memdup_user' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  bpf: don't open-code memdup_user()
  kimage_file_prepare_segments(): don't open-code memdup_user()
  ethtool: don't open-code memdup_user()
  do_ip_setsockopt(): don't open-code memdup_user()
  do_ipv6_setsockopt(): don't open-code memdup_user()
  irda: don't open-code memdup_user()
  xfrm_user_policy(): don't open-code memdup_user()
  ima_write_policy(): don't open-code memdup_user_nul()
  sel_write_validatetrans(): don't open-code memdup_user_nul()
This commit is contained in:
Linus Torvalds
2017-07-05 16:05:24 -07:00
parent ea3b25e132 e4448ed87c
commit 7114f51fcb
7 changed files with 52 additions and 118 deletions
Download Patch File Download Diff File Expand all files Collapse all files

45
kernel/bpf/syscall.c
View File

@@ -410,14 +410,11 @@ static int map_lookup_elem(union bpf_attr *attr)
if (IS_ERR(map))
return PTR_ERR(map);
err = -ENOMEM;
key = kmalloc(map->key_size, GFP_USER);
if (!key)
key = memdup_user(ukey, map->key_size);
if (IS_ERR(key)) {
err = PTR_ERR(key);
goto err_put;
err = -EFAULT;
if (copy_from_user(key, ukey, map->key_size) != 0)
goto free_key;
}
if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
@@ -493,14 +490,11 @@ static int map_update_elem(union bpf_attr *attr)
if (IS_ERR(map))
return PTR_ERR(map);
err = -ENOMEM;
key = kmalloc(map->key_size, GFP_USER);
if (!key)
key = memdup_user(ukey, map->key_size);
if (IS_ERR(key)) {
err = PTR_ERR(key);
goto err_put;
err = -EFAULT;
if (copy_from_user(key, ukey, map->key_size) != 0)
goto free_key;
}
if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
@@ -579,14 +573,11 @@ static int map_delete_elem(union bpf_attr *attr)
if (IS_ERR(map))
return PTR_ERR(map);
err = -ENOMEM;
key = kmalloc(map->key_size, GFP_USER);
if (!key)
key = memdup_user(ukey, map->key_size);
if (IS_ERR(key)) {
err = PTR_ERR(key);
goto err_put;
err = -EFAULT;
if (copy_from_user(key, ukey, map->key_size) != 0)
goto free_key;
}
preempt_disable();
__this_cpu_inc(bpf_prog_active);
@@ -598,7 +589,6 @@ static int map_delete_elem(union bpf_attr *attr)
if (!err)
trace_bpf_map_delete_elem(map, ufd, key);
free_key:
kfree(key);
err_put:
fdput(f);
@@ -627,14 +617,11 @@ static int map_get_next_key(union bpf_attr *attr)
return PTR_ERR(map);
if (ukey) {
err = -ENOMEM;
key = kmalloc(map->key_size, GFP_USER);
if (!key)
key = memdup_user(ukey, map->key_size);
if (IS_ERR(key)) {
err = PTR_ERR(key);
goto err_put;
err = -EFAULT;
if (copy_from_user(key, ukey, map->key_size) != 0)
goto free_key;
}
} else {
key = NULL;
}

14
kernel/kexec_file.c
View File

@@ -162,16 +162,10 @@ kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd,
}
if (cmdline_len) {
image->cmdline_buf = kzalloc(cmdline_len, GFP_KERNEL);
if (!image->cmdline_buf) {
ret = -ENOMEM;
goto out;
}
ret = copy_from_user(image->cmdline_buf, cmdline_ptr,
cmdline_len);
if (ret) {
ret = -EFAULT;
image->cmdline_buf = memdup_user(cmdline_ptr, cmdline_len);
if (IS_ERR(image->cmdline_buf)) {
ret = PTR_ERR(image->cmdline_buf);
image->cmdline_buf = NULL;
goto out;
}