Mercurial > hg > dhcpcd
changeset 5230:92569921a974 draft
Linux: Lock the BPF filter from future changes
| author | Roy Marples <roy@marples.name> |
|---|---|
| date | Sat, 16 May 2020 12:28:56 +0100 |
| parents | bb468c1a3b46 |
| children | a2c342295221 |
| files | src/if-linux.c |
| diffstat | 1 files changed, 11 insertions(+), 1 deletions(-) [+] |
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--- a/src/if-linux.c Fri May 15 22:29:30 2020 +0100 +++ b/src/if-linux.c Sat May 16 12:28:56 2020 +0100 @@ -1725,7 +1725,17 @@ }; /* Install the filter. */ - return setsockopt(s, SOL_SOCKET, SO_ATTACH_FILTER, &pf, sizeof(pf)); + if (setsockopt(s, SOL_SOCKET, SO_ATTACH_FILTER, &pf, sizeof(pf)) == -1) + return -1; + +#ifdef SO_LOCK_FILTER + int on = 1; + + if (setsockopt(s, SOL_SOCKET, SO_LOCK_FILTER, &on, sizeof(on)) == -1) + return -1; +#endif + + return 0; } int