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Upstream patch from https://github.com/libuv/libuv/pull/2966
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to address https://bugzilla.redhat.com/show_bug.cgi?id=1879330
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Resolves: #CVE-2020-8252
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From 0e6e8620496dff0eb285589ef1e37a7f407f3ddd Mon Sep 17 00:00:00 2001
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From: Ben Noordhuis <info@bnoordhuis.nl>
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Date: Mon, 24 Aug 2020 11:42:27 +0200
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Subject: unix: don't use _POSIX_PATH_MAX
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Libuv was using _POSIX_PATH_MAX wrong. Bug introduced in commit b56d279b
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("unix: do not require PATH_MAX to be defined") from September 2018.
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_POSIX_PATH_MAX is the minimum max path size guaranteed by POSIX, not
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the actual max path size of the system libuv runs on. _POSIX_PATH_MAX
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is always 256, the real max is often much bigger.
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This commit fixes buffer overruns when processing very long paths in
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uv_fs_readlink() and uv_fs_realpath() because libuv was not allocating
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enough memory to store the result.
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Fixes: https://github.com/libuv/libuv/issues/2965
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PR-URL: https://github.com/libuv/libuv/pull/2966
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Reviewed-By: Richard Lau <riclau@uk.ibm.com>
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Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
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Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
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Reviewed-By: Jameson Nash <vtjnash@gmail.com>
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---
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src/unix/internal.h | 4 +---
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1 file changed, 1 insertion(+), 3 deletions(-)
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diff --git a/src/unix/internal.h b/src/unix/internal.h
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index 30711673..9d3c2297 100644
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--- a/src/unix/internal.h
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+++ b/src/unix/internal.h
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@@ -62,9 +62,7 @@
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# include <AvailabilityMacros.h>
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#endif
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-#if defined(_POSIX_PATH_MAX)
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-# define UV__PATH_MAX _POSIX_PATH_MAX
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-#elif defined(PATH_MAX)
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+#if defined(PATH_MAX)
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# define UV__PATH_MAX PATH_MAX
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#else
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# define UV__PATH_MAX 8192
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--
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2.26.2
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