Blame SOURCES/nfs-utils-1.3.0-exportfs-ipv6-arg.patch

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commit 7f5f7fe118b87fbc6a2c6cc52aff808564d907a4
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Author: Todd Vierling <todd.vierling@oracle.com>
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Date:   Fri Sep 19 10:32:55 2014 -0400
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    exportfs: Properly parse IPv6 literal strings with null termination
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    The original implementation was using strncpy() with a truncation
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    length to an uninitialized stack buffer, leaving a string that
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    was only null terminated by luck.
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    While here, change to use no-copy semantics (no extra buffer) to
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    avoid buffer overflows altogether. exportfs already modifies argv
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    contents elsewhere, so this doesn't break anything anew.
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    Fixes: 4663c648 (exportfs: Support raw IPv6 addresses with
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    "client:/path")
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    Signed-off-by: Todd Vierling <todd.vierling@oracle.com>
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    Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
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    Signed-off-by: Steve Dickson <steved@redhat.com>
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diff --git a/utils/exportfs/exportfs.c b/utils/exportfs/exportfs.c
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index e7d1ac8..bdea12b 100644
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--- a/utils/exportfs/exportfs.c
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+++ b/utils/exportfs/exportfs.c
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@@ -351,16 +351,15 @@ static int exportfs_generic(char *arg, char *options, int verbose)
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 static int exportfs_ipv6(char *arg, char *options, int verbose)
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 {
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-	char *path, *c, hname[NI_MAXHOST + strlen("/128")];
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+	char *path, *c;
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 	arg++;
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 	c = strchr(arg, ']');
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 	if (c == NULL)
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 		return 1;
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-	strncpy(hname, arg, c - arg);
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 	/* no colon means this is a wildcarded DNS hostname */
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-	if (strchr(hname, ':') == NULL)
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+	if (memchr(arg, ':', c - arg) == NULL)
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 		return exportfs_generic(--arg, options, verbose);
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 	path = strstr(c, ":/");
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@@ -370,9 +369,9 @@ static int exportfs_ipv6(char *arg, char *options, int verbose)
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 	/* if there's anything between the closing brace and the
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 	 * path separator, it's probably a prefix length */
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-	strcat(hname, ++c);
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+	memmove(c, c + 1, path - c);
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-	exportfs_parsed(hname, path, options, verbose);
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+	exportfs_parsed(arg, path, options, verbose);
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 	return 0;
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 }
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@@ -458,16 +457,15 @@ static int unexportfs_generic(char *arg, int verbose)
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 static int unexportfs_ipv6(char *arg, int verbose)
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 {
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-	char *path, *c, hname[NI_MAXHOST + strlen("/128")];
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+	char *path, *c;
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 	arg++;
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 	c = strchr(arg, ']');
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 	if (c == NULL)
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 		return 1;
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-	strncpy(hname, arg, c - arg);
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 	/* no colon means this is a wildcarded DNS hostname */
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-	if (strchr(hname, ':') == NULL)
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+	if (memchr(arg, ':', c - arg) == NULL)
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 		return unexportfs_generic(--arg, verbose);
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 	path = strstr(c, ":/");
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@@ -477,9 +475,9 @@ static int unexportfs_ipv6(char *arg, int verbose)
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 	/* if there's anything between the closing brace and the
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 	 * path separator, it's probably a prefix length */
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-	strcat(hname, ++c);
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+	memmove(c, c + 1, path - c);
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-	unexportfs_parsed(hname, path, verbose);
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+	unexportfs_parsed(arg, path, verbose);
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 	return 0;
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 }
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