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Use memory safe snprintf() in Connect Engine

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This commit replaces sprintf(buf, ...) with
snprintf(buf, sizeof(buf), ...),
specifically in the "easy" cases where buf is allocated with a size
known at compile time.

The changes make sure we are not write outside array/string bounds which
will lead to undefined behaviour. In case the code is trying to write
outside bounds - safe version of functions simply cut the string
messages so we process this gracefully.

All new code of the whole pull request, including one or several files
that are either new files or modified ones, are contributed under the BSD-new
license.  I am contributing on behalf of my employer Amazon Web Services,
Inc.

bsonudf.cpp warnings cleanup by Daniel Black

Reviewer: Daniel Black
This commit is contained in:
Mikhail Chalov
2022-07-19 19:06:55 +00:00
committed by Daniel Black
parent 95eb5e5a12
commit 19af1890b5
61 changed files with 931 additions and 919 deletions
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8
storage/connect/libdoc.cpp
View File

@@ -661,7 +661,7 @@ xmlNodeSetPtr LIBXMLDOC::GetNodeList(PGLOBAL g, xmlNodePtr np, char *xp)
if (xmlXPathRegisterNs(Ctxp, BAD_CAST nsp->Prefix,
BAD_CAST nsp->Uri)) {
sprintf(g->Message, MSG(REGISTER_ERR), nsp->Prefix, nsp->Uri);
snprintf(g->Message, sizeof(g->Message), MSG(REGISTER_ERR), nsp->Prefix, nsp->Uri);
if (trace(1))
htrc("Ns error: %s\n", g->Message);
@@ -703,7 +703,7 @@ xmlNodeSetPtr LIBXMLDOC::GetNodeList(PGLOBAL g, xmlNodePtr np, char *xp)
// Evaluate table xpath
if (!(Xop = xmlXPathEval(BAD_CAST xp, Ctxp))) {
sprintf(g->Message, MSG(XPATH_EVAL_ERR), xp);
snprintf(g->Message, sizeof(g->Message), MSG(XPATH_EVAL_ERR), xp);
if (trace(1))
htrc("Path error: %s\n", g->Message);
@@ -882,7 +882,7 @@ RCODE XML2NODE::GetContent(PGLOBAL g, char *buf, int len)
} // endif p1
} else {
sprintf(g->Message, "Truncated %s content", Nodep->name);
snprintf(g->Message, sizeof(g->Message), "Truncated %s content", Nodep->name);
rc = RC_INFO;
} // endif len
@@ -1260,7 +1260,7 @@ RCODE XML2ATTR::GetText(PGLOBAL g, char *buf, int len)
if (strlen((char*)txt) >= (unsigned)len) {
memcpy(buf, txt, len - 1);
buf[len - 1] = 0;
sprintf(g->Message, "Truncated %s content", Atrp->name);
snprintf(g->Message, sizeof(g->Message), "Truncated %s content", Atrp->name);
rc = RC_INFO;
} else
strcpy(buf, (const char*)txt);