sysctl: require CAP_SYS_RAWIO to set mmap_min_addr
Currently the mmap_min_addr value can only be bypassed during mmap when the task has CAP_SYS_RAWIO. However, the mmap_min_addr sysctl value itself can be adjusted to 0 if euid == 0, allowing a bypass without CAP_SYS_RAWIO. This patch adds a check for the capability before allowing mmap_min_addr to be changed. Signed-off-by: NKees Cook <kees.cook@canonical.com> Acked-by: NSerge Hallyn <serue@us.ibm.com> Signed-off-by: NJames Morris <jmorris@namei.org>
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