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ntp: limit number of sources

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Don't rely on assertions and running out of memory to terminate if
an extremely large number of sources is added. Set the maximum number
to 65536 to have a practical limit where chronyd still has a chance to
appear functional with some operations having a quadratic time
complexity.
This commit is contained in:
Miroslav Lichvar 2021-02-10 13:21:37 +01:00
parent 3f2806c19c
commit 4d139eeca6
1 changed files with 5 additions and 0 deletions
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5
ntp_sources.c
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@ -45,6 +45,9 @@
/* ================================================== */
/* Maximum number of sources */
#define MAX_SOURCES 65536
/* Record type private to this file, used to store information about
particular sources */
typedef struct {
@ -336,6 +339,8 @@ add_source(NTP_Remote_Address *remote_addr, char *name, NTP_Source_Type type,
} else if (!name && !UTI_IsIPReal(&remote_addr->ip_addr)) {
/* Name is required for non-real addresses */
return NSR_InvalidName;
} else if (n_sources >= MAX_SOURCES) {
return NSR_TooManySources;
} else {
if (remote_addr->ip_addr.family != IPADDR_INET4 &&
remote_addr->ip_addr.family != IPADDR_INET6 &&