cperciva / imds-filterd Goto Github PK
View Code? Open in Web Editor NEWIntercepts and filters requests to the EC2 Instance Metadata Service
License: Other
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imds-filterd's Issues
Can I block access from all jails?
Is it possible to block root from within a jail? Or is a root user in jail not considered root by this tool?
Left-shifting a negative value is undefined
imds-filterd/netconfig.c, line 88:
/* Which address type is this? */
if ((i = ffs(rt->rtm_addrs & ((-1) << i))) == 0) {
warn0("Routing message contains wrong number of addresses!");
goto err0;
}
I believe that (-1) << i is undefined in C99. The spec says:
C99 draft, 6.5.7 Bitwise shift operators
..
4. The result of E1 << E2 is E1 left-shifted E2 bit positions... If E1 has a signed
type and nonnegative value, and E1 × 2^{E2} is representable in the result type, then that is
the resulting value; otherwise, the behavior is undefined.
One fix might be to change (-1) to ((size_t)-1), but I see that struct rt_msghrd contains int rtmaddrs. So maybe the whole line should be
if ((i = ffs(rt->rtm_addrs & (int)(((size_t)-1) << i))) == 0) {
But I've never worked with man 4 route before, nor do I have a good sense of what that code is doing, so I figured that I'd leave it to you.
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