Messages in this thread | | | From | Linus Torvalds <> | Date | Wed, 4 Oct 2017 12:23:02 -0700 | Subject | Re: [kernel-hardening] [RFC V2 4/6] lib: vsprintf: default kptr_restrict to the maximum value |
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On Wed, Oct 4, 2017 at 12:13 PM, Jann Horn <jannh@google.com> wrote: > > Actually, /proc/kallsyms uses %pK, which hacks around this issue > by checking for `euid != uid` in addition to the capability check - so this > isn't exploitable through a typical setuid program.
Fair enough, you'd have to be a pretty broken suid program to have set uid to euid before reading some untrusted file descriptor.
I could still imagine happening (hey, the X server used to sendmsg file descriptors back and forth), but hopefully it's not really realistic.
Linus
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