glibc-2.24.90-23.fc26 in rawhide is the first version which adds
getentropy and getrandom. (The ppc64 build is still running, but I
assume it will complete eventually.)
The implementation resides in the new <sys/random.h> header. As this is
not a POSIX header, no feature test macros are required. getentropy is
intended for seeding a PRNG (such as RAND_bytes in OpenSSL). getrandom
is the lower-level system call wrapper.
The implementation does not have any protection against symbol
interposition because I could not get that approved upstream. We might
change that before the next glibc release, but in the meantime, we need
to remove all definitions of getrandom or getentropy with external
linkage from applications and libraries. I'll file bugs as required.
(Otherwise, symbol interposition kicks in, and libraries such as OpenSSL
or GNUTLS might not get the symbol they expect, but something else.
Symbol interposition is triggered even by legacy code which does not
include <sys/random.h>, merely by defining a public symbol with the name
getentropy or getrandom.)
Thanks,
Florian
_______________________________________________
devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx
To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx
