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Truncate strings in tarCreateHeader() with strlcpy(), not sprintf().

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This supplements the GNU libc bug #6530 workarounds introduced in commit
54cd4f04576833abc394e131288bf3dd7dcf4806.  On affected systems, a
tar-format pg_basebackup failed when some filename beneath the data
directory was not valid character data in the postmaster/walsender
locale.  Back-patch to 9.1, where pg_basebackup was introduced.  Extant,
bug-prone conversion specifications receive only ASCII bytes or involve
low-importance messages.
This commit is contained in:
Noah Misch 2015-06-21 20:04:36 -04:00
parent 2031931440
commit 45a1d77707
1 changed files with 4 additions and 4 deletions
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8
src/port/tar.c
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@ -62,7 +62,7 @@ tarCreateHeader(char *h, const char *filename, const char *linktarget,
memset(h, 0, 512); /* assume tar header size */
/* Name 100 */
sprintf(&h[0], "%.99s", filename);
strlcpy(&h[0], filename, 100);
if (linktarget != NULL || S_ISDIR(mode))
{
/*
@ -104,7 +104,7 @@ tarCreateHeader(char *h, const char *filename, const char *linktarget,
/* Type - Symbolic link */
sprintf(&h[156], "2");
/* Link Name 100 */
sprintf(&h[157], "%.99s", linktarget);
strlcpy(&h[157], linktarget, 100);
}
else if (S_ISDIR(mode))
/* Type - directory */
@ -121,11 +121,11 @@ tarCreateHeader(char *h, const char *filename, const char *linktarget,
/* User 32 */
/* XXX: Do we need to care about setting correct username? */
sprintf(&h[265], "%.31s", "postgres");
strlcpy(&h[265], "postgres", 32);
/* Group 32 */
/* XXX: Do we need to care about setting correct group name? */
sprintf(&h[297], "%.31s", "postgres");
strlcpy(&h[297], "postgres", 32);
/* Major Dev 8 */
sprintf(&h[329], "%07o ", 0);