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libapr-util1
apr-util-1.5.3-CVE-2017-12618.patch
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File apr-util-1.5.3-CVE-2017-12618.patch of Package libapr-util1
From f672b565c825c34de9ee298b5bdc62c01cdd6147 Mon Sep 17 00:00:00 2001 From: Yann Ylavic <ylavic@apache.org> Date: Sat, 23 Sep 2017 11:15:36 +0000 Subject: [PATCH] sdbm: better database/page validation to fail cleanly when corrupted. git-svn-id: https://svn.apache.org/repos/asf/apr/apr/trunk@1809394 13f79535-47bb-0310-9956-ffa450edef68 --- dbm/sdbm/sdbm.c | 78 ++++++++++++++++++++++++++-------------------------- dbm/sdbm/sdbm_pair.c | 3 +- 2 files changed, 41 insertions(+), 40 deletions(-) diff --git a/dbm/sdbm/sdbm.c b/dbm/sdbm/sdbm.c index 3f4d65d92d..9ad9d20ff5 100644 --- a/dbm/sdbm/sdbm.c +++ b/dbm/sdbm/sdbm.c @@ -40,7 +40,7 @@ */ static int getdbit (apr_sdbm_t *, long); static apr_status_t setdbit(apr_sdbm_t *, long); -static apr_status_t getpage(apr_sdbm_t *db, long); +static apr_status_t getpage(apr_sdbm_t *db, long, int, int); static apr_status_t getnext(apr_sdbm_datum_t *key, apr_sdbm_t *db); static apr_status_t makroom(apr_sdbm_t *, long, int); @@ -93,6 +93,7 @@ static apr_status_t prep(apr_sdbm_t **pdb, const char *dirname, const char *pagn db = malloc(sizeof(*db)); memset(db, 0, sizeof(*db)); + db->pagbno = -1L; db->pool = p; @@ -193,7 +194,7 @@ APR_DECLARE(apr_status_t) apr_sdbm_fetch(apr_sdbm_t *db, apr_sdbm_datum_t *val, if ((status = apr_sdbm_lock(db, APR_FLOCK_SHARED)) != APR_SUCCESS) return status; - if ((status = getpage(db, exhash(key))) == APR_SUCCESS) { + if ((status = getpage(db, exhash(key), 0, 1)) == APR_SUCCESS) { *val = getpair(db->pagbuf, key); /* ### do we want a not-found result? */ } @@ -227,7 +228,7 @@ APR_DECLARE(apr_status_t) apr_sdbm_delete(apr_sdbm_t *db, if ((status = apr_sdbm_lock(db, APR_FLOCK_EXCLUSIVE)) != APR_SUCCESS) return status; - if ((status = getpage(db, exhash(key))) == APR_SUCCESS) { + if ((status = getpage(db, exhash(key), 0, 1)) == APR_SUCCESS) { if (!delpair(db->pagbuf, key)) /* ### should we define some APRUTIL codes? */ status = APR_EGENERAL; @@ -261,7 +262,7 @@ APR_DECLARE(apr_status_t) apr_sdbm_store(apr_sdbm_t *db, apr_sdbm_datum_t key, if ((status = apr_sdbm_lock(db, APR_FLOCK_EXCLUSIVE)) != APR_SUCCESS) return status; - if ((status = getpage(db, (hash = exhash(key)))) == APR_SUCCESS) { + if ((status = getpage(db, (hash = exhash(key)), 0, 1)) == APR_SUCCESS) { /* * if we need to replace, delete the key/data pair @@ -376,17 +377,19 @@ static apr_status_t makroom(apr_sdbm_t *db, long hash, int need) /* Reads 'len' bytes from file 'f' at offset 'off' into buf. * 'off' is given relative to the start of the file. - * If EOF is returned while reading, this is taken as success. + * If 'create' is asked and EOF is returned while reading, this is taken + * as success (i.e. a cleared buffer is returned). */ static apr_status_t read_from(apr_file_t *f, void *buf, - apr_off_t off, apr_size_t len) + apr_off_t off, apr_size_t len, + int create) { apr_status_t status; if ((status = apr_file_seek(f, APR_SET, &off)) != APR_SUCCESS || ((status = apr_file_read_full(f, buf, len, NULL)) != APR_SUCCESS)) { /* if EOF is reached, pretend we read all zero's */ - if (status == APR_EOF) { + if (status == APR_EOF && create) { memset(buf, 0, len); status = APR_SUCCESS; } @@ -410,9 +413,7 @@ APR_DECLARE(apr_status_t) apr_sdbm_firstkey(apr_sdbm_t *db, /* * start at page 0 */ - if ((status = read_from(db->pagf, db->pagbuf, OFF_PAG(0), PBLKSIZ)) - == APR_SUCCESS) { - db->pagbno = 0; + if ((status = getpage(db, 0, 1, 1)) == APR_SUCCESS) { db->blkptr = 0; db->keyptr = 0; status = getnext(key, db); @@ -441,24 +442,28 @@ APR_DECLARE(apr_status_t) apr_sdbm_nextkey(apr_sdbm_t *db, /* * all important binary tree traversal */ -static apr_status_t getpage(apr_sdbm_t *db, long hash) +static apr_status_t getpage(apr_sdbm_t *db, long hash, int by_num, int create) { - register int hbit; - register long dbit; - register long pagb; apr_status_t status; + register long pagb; - dbit = 0; - hbit = 0; - while (dbit < db->maxbno && getdbit(db, dbit)) - dbit = 2 * dbit + ((hash & (1 << hbit++)) ? 2 : 1); + if (by_num) { + pagb = hash; + } + else { + register int hbit = 0; + register long dbit = 0; - debug(("dbit: %d...", dbit)); + while (dbit < db->maxbno && getdbit(db, dbit)) + dbit = 2 * dbit + ((hash & (1 << hbit++)) ? 2 : 1); + debug(("dbit: %d...", dbit)); - db->curbit = dbit; - db->hmask = masks[hbit]; + db->curbit = dbit; + db->hmask = masks[hbit]; + + pagb = hash & db->hmask; + } - pagb = hash & db->hmask; /* * see if the block we need is already in memory. * note: this lookaside cache has about 10% hit rate. @@ -470,12 +475,14 @@ static apr_status_t getpage(apr_sdbm_t *db, long hash) * ### joe: this assumption was surely never correct? but * ### we make it so in read_from anyway. */ - if ((status = read_from(db->pagf, db->pagbuf, OFF_PAG(pagb), PBLKSIZ)) - != APR_SUCCESS) + if ((status = read_from(db->pagf, db->pagbuf, + OFF_PAG(pagb), PBLKSIZ, + create)) != APR_SUCCESS) return status; if (!chkpage(db->pagbuf)) return APR_ENOSPC; /* ### better error? */ + db->pagbno = pagb; debug(("pag read: %d\n", pagb)); @@ -492,8 +499,9 @@ static int getdbit(apr_sdbm_t *db, long dbit) dirb = c / DBLKSIZ; if (dirb != db->dirbno) { - if (read_from(db->dirf, db->dirbuf, OFF_DIR(dirb), DBLKSIZ) - != APR_SUCCESS) + if (read_from(db->dirf, db->dirbuf, + OFF_DIR(dirb), DBLKSIZ, + 1) != APR_SUCCESS) return 0; db->dirbno = dirb; @@ -515,8 +523,9 @@ static apr_status_t setdbit(apr_sdbm_t *db, long dbit) dirb = c / DBLKSIZ; if (dirb != db->dirbno) { - if ((status = read_from(db->dirf, db->dirbuf, OFF_DIR(dirb), DBLKSIZ)) - != APR_SUCCESS) + if ((status = read_from(db->dirf, db->dirbuf, + OFF_DIR(dirb), DBLKSIZ, + 1)) != APR_SUCCESS) return status; db->dirbno = dirb; @@ -553,21 +562,12 @@ static apr_status_t getnext(apr_sdbm_datum_t *key, apr_sdbm_t *db) * try the next one... If we lost our position on the * file, we will have to seek. */ + db->blkptr++; db->keyptr = 0; - if (db->pagbno != db->blkptr++) { - apr_off_t off = OFF_PAG(db->blkptr); - if ((status = apr_file_seek(db->pagf, APR_SET, &off)) - != APR_SUCCESS) - return status; - } - db->pagbno = db->blkptr; /* ### EOF acceptable here too? */ - if ((status = apr_file_read_full(db->pagf, db->pagbuf, PBLKSIZ, NULL)) - != APR_SUCCESS) + if ((status = getpage(db, db->blkptr, 1, 0)) != APR_SUCCESS) return status; - if (!chkpage(db->pagbuf)) - return APR_EGENERAL; /* ### need better error */ } /* NOTREACHED */ diff --git a/dbm/sdbm/sdbm_pair.c b/dbm/sdbm/sdbm_pair.c index 2130200734..50d7965b14 100644 --- a/dbm/sdbm/sdbm_pair.c +++ b/dbm/sdbm/sdbm_pair.c @@ -308,7 +308,8 @@ char *pag; if (n > 0) { off = PBLKSIZ; for (ino++; n > 0; ino += 2) { - if (ino[0] > off || ino[1] > off || + if (ino[0] < 0 || ino[0] > off || + ino[1] < 0 || ino[1] > off || ino[1] > ino[0]) return 0; off = ino[1];
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