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From cc3098b63174b8aa875d1f2e9c6ea94407b211b8 Mon Sep 17 00:00:00 2001
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From: Rainer Gerhards <rgerhards@adiscon.com>
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Date: Thu, 16 Feb 2017 19:02:36 +0100
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Subject: [PATCH 04/11] Bug 1582517 - rsyslog: Buffer overflow in memcpy() in parser.c
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core: fix potential misadressing in parser message sanitizer
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misadressing could happen when an oversize message made it to the
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sanitizer AND contained a control character in the oversize part
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of the message. Note that it is an error in itself that such an
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oversize message enters the system, but we harden the sanitizer
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to handle this gracefully (it will truncate the message).
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Note that truncation may still - as previously - happen if the
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number of escape characters makes the string grow above the max
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message size.
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(cherry picked from commit 20f8237870eb5e971fa068e4dd4d296f1dbef329)
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---
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runtime/parser.c | 8 +++++++-
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1 file changed, 7 insertions(+), 1 deletion(-)
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diff --git a/runtime/parser.c b/runtime/parser.c
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index 0574d982a..9645baa40 100644
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--- a/runtime/parser.c
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+++ b/runtime/parser.c
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@@ -464,9 +464,15 @@ SanitizeMsg(smsg_t *pMsg)
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if(maxDest < sizeof(szSanBuf))
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pDst = szSanBuf;
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else
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- CHKmalloc(pDst = MALLOC(iMaxLine + 1));
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+ CHKmalloc(pDst = MALLOC(maxDest + 1));
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if(iSrc > 0) {
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iSrc--; /* go back to where everything is OK */
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+ if(iSrc > maxDest) {
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+ DBGPRINTF("parser.Sanitize: have oversize index %zd, "
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+ "max %zd - corrected, but should not happen\n",
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+ iSrc, maxDest);
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+ iSrc = maxDest;
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+ }
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memcpy(pDst, pszMsg, iSrc); /* fast copy known good */
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}
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iDst = iSrc;
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--
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2.14.4
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