[net,1/6] ipvs: fix UB due to uninitialized stack access in ip_vs_protocol_init()

From: Jinghao Jia <jinghao7@illinois.edu>

Under certain kernel configurations when building with Clang/LLVM, the
compiler does not generate a return or jump as the terminator
instruction for ip_vs_protocol_init(), triggering the following objtool
warning during build time:

  vmlinux.o: warning: objtool: ip_vs_protocol_init() falls through to next function __initstub__kmod_ip_vs_rr__935_123_ip_vs_rr_init6()

At runtime, this either causes an oops when trying to load the ipvs
module or a boot-time panic if ipvs is built-in. This same issue has
been reported by the Intel kernel test robot previously.

Digging deeper into both LLVM and the kernel code reveals this to be a
undefined behavior problem. ip_vs_protocol_init() uses a on-stack buffer
of 64 chars to store the registered protocol names and leaves it
uninitialized after definition. The function calls strnlen() when
concatenating protocol names into the buffer. With CONFIG_FORTIFY_SOURCE
strnlen() performs an extra step to check whether the last byte of the
input char buffer is a null character (commit 3009f891bb9f ("fortify:
Allow strlen() and strnlen() to pass compile-time known lengths")).
This, together with possibly other configurations, cause the following
IR to be generated:

  define hidden i32 @ip_vs_protocol_init() local_unnamed_addr #5 section ".init.text" align 16 !kcfi_type !29 {
    %1 = alloca [64 x i8], align 16
    ...

  14:                                               ; preds = %11
    %15 = getelementptr inbounds i8, ptr %1, i64 63
    %16 = load i8, ptr %15, align 1
    %17 = tail call i1 @llvm.is.constant.i8(i8 %16)
    %18 = icmp eq i8 %16, 0
    %19 = select i1 %17, i1 %18, i1 false
    br i1 %19, label %20, label %23

  20:                                               ; preds = %14
    %21 = call i64 @strlen(ptr noundef nonnull dereferenceable(1) %1) #23
    ...

  23:                                               ; preds = %14, %11, %20
    %24 = call i64 @strnlen(ptr noundef nonnull dereferenceable(1) %1, i64 noundef 64) #24
    ...
  }

The above code calculates the address of the last char in the buffer
(value %15) and then loads from it (value %16). Because the buffer is
never initialized, the LLVM GVN pass marks value %16 as undefined:

  %13 = getelementptr inbounds i8, ptr %1, i64 63
  br i1 undef, label %14, label %17

This gives later passes (SCCP, in particular) more DCE opportunities by
propagating the undef value further, and eventually removes everything
after the load on the uninitialized stack location:

  define hidden i32 @ip_vs_protocol_init() local_unnamed_addr #0 section ".init.text" align 16 !kcfi_type !11 {
    %1 = alloca [64 x i8], align 16
    ...

  12:                                               ; preds = %11
    %13 = getelementptr inbounds i8, ptr %1, i64 63
    unreachable
  }

In this way, the generated native code will just fall through to the
next function, as LLVM does not generate any code for the unreachable IR
instruction and leaves the function without a terminator.

Zero the on-stack buffer to avoid this possible UB.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202402100205.PWXIz1ZK-lkp@intel.com/
Co-developed-by: Ruowen Qin <ruqin@redhat.com>
Signed-off-by: Ruowen Qin <ruqin@redhat.com>
Signed-off-by: Jinghao Jia <jinghao7@illinois.edu>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/ipvs/ip_vs_proto.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

Hello:

This series was applied to netdev/net.git (main)
by Pablo Neira Ayuso <pablo@netfilter.org>:

On Thu,  5 Dec 2024 01:28:49 +0100 you wrote:
> From: Jinghao Jia <jinghao7@illinois.edu>
> 
> Under certain kernel configurations when building with Clang/LLVM, the
> compiler does not generate a return or jump as the terminator
> instruction for ip_vs_protocol_init(), triggering the following objtool
> warning during build time:
> 
> [...]

Here is the summary with links:
  - [net,1/6] ipvs: fix UB due to uninitialized stack access in ip_vs_protocol_init()
    https://git.kernel.org/netdev/net/c/146b6f1112eb
  - [net,2/6] netfilter: x_tables: fix LED ID check in led_tg_check()
    https://git.kernel.org/netdev/net/c/04317f4eb2aa
  - [net,3/6] netfilter: nft_socket: remove WARN_ON_ONCE on maximum cgroup level
    https://git.kernel.org/netdev/net/c/b7529880cb96
  - [net,4/6] netfilter: nft_inner: incorrect percpu area handling under softirq
    https://git.kernel.org/netdev/net/c/7b1d83da254b
  - [net,5/6] netfilter: ipset: Hold module reference while requesting a module
    https://git.kernel.org/netdev/net/c/456f010bfaef
  - [net,6/6] netfilter: nft_set_hash: skip duplicated elements pending gc run
    https://git.kernel.org/netdev/net/c/7ffc7481153b

You are awesome, thank you!