CVE-2022-50728

Description

In the Linux kernel, the following vulnerability has been resolved: s390/lcs: Fix return type of lcs_start_xmit() With clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG), indirect call targets are validated against the expected function pointer prototype to make sure the call target is valid to help mitigate ROP attacks. If they are not identical, there is a failure at run time, which manifests as either a kernel panic or thread getting killed. A proposed warning in clang aims to catch these at compile time, which reveals: drivers/s390/net/lcs.c:2090:21: error: incompatible function pointer types initializing 'netdev_tx_t (*)(struct sk_buff *, struct net_device *)' (aka 'enum netdev_tx (*)(struct sk_buff *, struct net_device *)') with an expression of type 'int (struct sk_buff *, struct net_device *)' [-Werror,-Wincompatible-function-pointer-types-strict] .ndo_start_xmit = lcs_start_xmit, ^~~~~~~~~~~~~~ drivers/s390/net/lcs.c:2097:21: error: incompatible function pointer types initializing 'netdev_tx_t (*)(struct sk_buff *, struct net_device *)' (aka 'enum netdev_tx (*)(struct sk_buff *, struct net_device *)') with an expression of type 'int (struct sk_buff *, struct net_device *)' [-Werror,-Wincompatible-function-pointer-types-strict] .ndo_start_xmit = lcs_start_xmit, ^~~~~~~~~~~~~~ ->ndo_start_xmit() in 'struct net_device_ops' expects a return type of 'netdev_tx_t', not 'int'. Adjust the return type of lcs_start_xmit() to match the prototype's to resolve the warning and potential CFI failure, should s390 select ARCH_SUPPORTS_CFI_CLANG in the future.

PUBLISHED Reserved 2025-12-24 | Published 2025-12-24 | Updated 2025-12-24 | Assigner Linux

Product status

References

git.kernel.org/...c/7b4da3fcd513b8e67823eb80da37aad99b3339c1

git.kernel.org/...c/d49cc2b705711fb8fb849e7c660929b2100360b7

git.kernel.org/...c/e684215d8a903752e2b0cc946517fb61e57a880a

git.kernel.org/...c/20022d551f2064a194d8e0acb6cd7a85094a17b2

git.kernel.org/...c/ebc3c77785dc8b5b626309c0032a38fbb139287a

git.kernel.org/...c/5ad774fb823c24bbeb21a15a67103ea7a6f5b928

git.kernel.org/...c/69669820844f81a77b6db24b86581320ae4d17af

git.kernel.org/...c/cda74cdc280ba35c8993e7517bac5c257ff36f18

git.kernel.org/...c/bb16db8393658e0978c3f0d30ae069e878264fa3

cve.org (CVE-2022-50728)

nvd.nist.gov (CVE-2022-50728)

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