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Tom Lane 42f94f56bf Fix incautious handling of possibly-miscoded strings in client code. ... An incorrectly-encoded multibyte character near the end of a string could cause various processing loops to run past the string's terminating NUL, with results ranging from no detectable issue to a program crash, depending on what happens to be in the following memory. This isn't an issue in the server, because we take care to verify the encoding of strings before doing any interesting processing on them. However, that lack of care leaked into client-side code which shouldn't assume that anyone has validated the encoding of its input. Although this is certainly a bug worth fixing, the PG security team elected not to regard it as a security issue, primarily because any untrusted text should be sanitized by PQescapeLiteral or the like before being incorporated into a SQL or psql command. (If an app fails to do so, the same technique can be used to cause SQL injection, with probably much more dire consequences than a mere client-program crash.) Those functions were already made proof against this class of problem, cf CVE-2006-2313. To fix, invent PQmblenBounded() which is like PQmblen() except it won't return more than the number of bytes remaining in the string. In HEAD we can make this a new libpq function, as PQmblen() is. It seems imprudent to change libpq's API in stable branches though, so in the back branches define PQmblenBounded as a macro in the files that need it. (Note that just changing PQmblen's behavior would not be a good idea; notably, it would completely break the escaping functions' defense against this exact problem. So we just want a version for those callers that don't have any better way of handling this issue.) Per private report from houjingyi. Back-patch to all supported branches.		5 years ago
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.gitignore	Move psql's psqlscan.l into src/fe_utils.	10 years ago
Makefile	Move some code from src/bin/scripts to src/fe_utils to permit reuse.	5 years ago
archive.c	Update copyright for 2021	5 years ago
cancel.c	Update copyright for 2021	5 years ago
conditional.c	Update copyright for 2021	5 years ago
connect_utils.c	Move some code from src/bin/scripts to src/fe_utils to permit reuse.	5 years ago
mbprint.c	Update copyright for 2021	5 years ago
option_utils.c	Move some code from src/bin/scripts to src/fe_utils to permit reuse.	5 years ago
parallel_slot.c	Refactor and generalize the ParallelSlot machinery.	5 years ago
print.c	Fix incautious handling of possibly-miscoded strings in client code.	5 years ago
psqlscan.l	psql: Fix line continuation prompts for unbalanced parentheses	5 years ago
query_utils.c	Move some code from src/bin/scripts to src/fe_utils to permit reuse.	5 years ago
recovery_gen.c	Update copyright for 2021	5 years ago
simple_list.c	Update copyright for 2021	5 years ago
string_utils.c	Fix incautious handling of possibly-miscoded strings in client code.	5 years ago