diff options
author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-20 17:22:58 +0100 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-04-02 15:28:23 +0200 |
commit | 638d8c748e9d8f14a1574202fd754f90dbce28c1 (patch) | |
tree | d6a84dbbddc162bd717b5529e6d2d92310534344 /kernel/bpf | |
parent | aca6a9b0985b9cde317558b5bbd6e883d96f0560 (diff) |
bpf: Explicitly memset some bpf info structures declared on the stack
commit 5c6f25887963f15492b604dd25cb149c501bbabf upstream.
Trying to initialize a structure with "= {};" will not always clean out
all padding locations in a structure. So be explicit and call memset to
initialize everything for a number of bpf information structures that
are then copied from userspace, sometimes from smaller memory locations
than the size of the structure.
Reported-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20200320162258.GA794295@kroah.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/bpf')
-rw-r--r-- | kernel/bpf/btf.c | 3 | ||||
-rw-r--r-- | kernel/bpf/syscall.c | 6 |
2 files changed, 6 insertions, 3 deletions
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 86b915583571..471cc5c117a5 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -2387,7 +2387,7 @@ int btf_get_info_by_fd(const struct btf *btf, union bpf_attr __user *uattr) { struct bpf_btf_info __user *uinfo; - struct bpf_btf_info info = {}; + struct bpf_btf_info info; u32 info_copy, btf_copy; void __user *ubtf; u32 uinfo_len; @@ -2396,6 +2396,7 @@ int btf_get_info_by_fd(const struct btf *btf, uinfo_len = attr->info.info_len; info_copy = min_t(u32, uinfo_len, sizeof(info)); + memset(&info, 0, sizeof(info)); if (copy_from_user(&info, uinfo, info_copy)) return -EFAULT; diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index af3a40b35baf..b766265cf37d 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -1958,7 +1958,7 @@ static int bpf_prog_get_info_by_fd(struct bpf_prog *prog, union bpf_attr __user *uattr) { struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info); - struct bpf_prog_info info = {}; + struct bpf_prog_info info; u32 info_len = attr->info.info_len; char __user *uinsns; u32 ulen; @@ -1969,6 +1969,7 @@ static int bpf_prog_get_info_by_fd(struct bpf_prog *prog, return err; info_len = min_t(u32, sizeof(info), info_len); + memset(&info, 0, sizeof(info)); if (copy_from_user(&info, uinfo, info_len)) return -EFAULT; @@ -2136,7 +2137,7 @@ static int bpf_map_get_info_by_fd(struct bpf_map *map, union bpf_attr __user *uattr) { struct bpf_map_info __user *uinfo = u64_to_user_ptr(attr->info.info); - struct bpf_map_info info = {}; + struct bpf_map_info info; u32 info_len = attr->info.info_len; int err; @@ -2145,6 +2146,7 @@ static int bpf_map_get_info_by_fd(struct bpf_map *map, return err; info_len = min_t(u32, sizeof(info), info_len); + memset(&info, 0, sizeof(info)); info.type = map->map_type; info.id = map->id; info.key_size = map->key_size; |