From 4c06c619faceb5d158a725d97fda45cadb2cf9c9 Mon Sep 17 00:00:00 2001 From: Nick Mathewson Date: Tue, 18 May 2021 08:40:09 -0400 Subject: Use a more secure hash function for the circuitmux hashtable. Fixes bug 40931; bugfix on 0.2.4.4-alpha. Also tracked as TROVE-2021-005. This issue was reported by Jann Horn from Google's Project Zero. --- src/core/or/circuitmux.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'src/core') diff --git a/src/core/or/circuitmux.c b/src/core/or/circuitmux.c index 88f9ac7923..e7309553c4 100644 --- a/src/core/or/circuitmux.c +++ b/src/core/or/circuitmux.c @@ -216,9 +216,10 @@ chanid_circid_entries_eq(chanid_circid_muxinfo_t *a, static inline unsigned int chanid_circid_entry_hash(chanid_circid_muxinfo_t *a) { - return (((unsigned int)(a->circ_id) << 8) ^ - ((unsigned int)((a->chan_id >> 32) & 0xffffffff)) ^ - ((unsigned int)(a->chan_id & 0xffffffff))); + uint8_t data[8 + 4]; + set_uint64(data, a->chan_id); + set_uint32(data + 8, a->circ_id); + return (unsigned) siphash24g(data, sizeof(data)); } /* Declare the struct chanid_circid_muxinfo_map type */ @@ -1361,4 +1362,3 @@ circuitmux_compare_muxes, (circuitmux_t *cmux_1, circuitmux_t *cmux_2)) return 0; } } - -- cgit v1.2.3-54-g00ecf