Description

In the Linux kernel, the following vulnerability has been resolved: arm64/gcs: Fix error handling in arch_set_shadow_stack_status() alloc_gcs() returns an error-encoded pointer on failure, which comes from do_mmap(), not NULL. The current NULL check fails to detect errors, which could lead to using an invalid GCS address. Use IS_ERR_VALUE() to properly detect errors, consistent with the check in gcs_alloc_thread_stack().

References 3

• git.kernel.org https://git.kernel.org/stable/c/53c998527ffa60f9deda8974a11ad39790684159
• git.kernel.org https://git.kernel.org/stable/c/a4741114c9622346c4bbb8cc2bbd88153616ffaf
• git.kernel.org https://git.kernel.org/stable/c/c787a235deb33be6eda40beee8f561da5fd8cb8c

Remediation