diff options
Diffstat (limited to 'src/backend/utils/adt/pg_locale.c')
| -rw-r--r-- | src/backend/utils/adt/pg_locale.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/src/backend/utils/adt/pg_locale.c b/src/backend/utils/adt/pg_locale.c index 84215e07a77..d91959ea7f8 100644 --- a/src/backend/utils/adt/pg_locale.c +++ b/src/backend/utils/adt/pg_locale.c @@ -855,6 +855,64 @@ IsoLocaleName(const char *winlocname) /* + * Detect aging strxfrm() implementations that, in a subset of locales, write + * past the specified buffer length. Affected users must update OS packages + * before using PostgreSQL 9.5 or later. + * + * Assume that the bug can come and go from one postmaster startup to another + * due to physical replication among diverse machines. Assume that the bug's + * presence will not change during the life of a particular postmaster. Given + * those assumptions, call this no less than once per postmaster startup per + * LC_COLLATE setting used. No known-affected system offers strxfrm_l(), so + * there is no need to consider pg_collation locales. + */ +void +check_strxfrm_bug(void) +{ + char buf[32]; + const int canary = 0x7F; + bool ok = true; + + /* + * Given a two-byte ASCII string and length limit 7, 8 or 9, Solaris 10 + * 05/08 returns 18 and modifies 10 bytes. It respects limits above or + * below that range. + * + * The bug is present in Solaris 8 as well; it is absent in Solaris 10 + * 01/13 and Solaris 11.2. Affected locales include is_IS.ISO8859-1, + * en_US.UTF-8, en_US.ISO8859-1, and ru_RU.KOI8-R. Unaffected locales + * include de_DE.UTF-8, de_DE.ISO8859-1, zh_TW.UTF-8, and C. + */ + buf[7] = canary; + (void) strxfrm(buf, "ab", 7); + if (buf[7] != canary) + ok = false; + + /* + * illumos bug #1594 was present in the source tree from 2010-10-11 to + * 2012-02-01. Given an ASCII string of any length and length limit 1, + * affected systems ignore the length limit and modify a number of bytes + * one less than the return value. The problem inputs for this bug do not + * overlap those for the Solaris bug, hence a distinct test. + * + * Affected systems include smartos-20110926T021612Z. Affected locales + * include en_US.ISO8859-1 and en_US.UTF-8. Unaffected locales include C. + */ + buf[1] = canary; + (void) strxfrm(buf, "a", 1); + if (buf[1] != canary) + ok = false; + + if (!ok) + ereport(ERROR, + (errcode(ERRCODE_SYSTEM_ERROR), + errmsg_internal("strxfrm(), in locale \"%s\", writes past the specified array length", + setlocale(LC_COLLATE, NULL)), + errhint("Apply system library package updates."))); +} + + +/* * Cache mechanism for collation information. * * We cache two flags: whether the collation's LC_COLLATE or LC_CTYPE is C |