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autofs-5.1.0 - fix mount as you go offset selection
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From: Ian Kent <raven@themaw.net>
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The function cache_get_offset() returns offsets to be mounted that
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are within the current current subtree for the mount-as-you-go
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functionality used for nested multi-mount map entries.
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However, the function was returning offsets from the subree below
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nesting points which prevented the mount at the containing nesting
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point from being mounted. This is because the kernel will see a
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non-empty directory and conclude it isn't a mount point.
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---
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CHANGELOG | 1 +
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lib/cache.c | 27 ++++++++++++++++++++++++---
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2 files changed, 25 insertions(+), 3 deletions(-)
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--- autofs-5.0.7.orig/CHANGELOG
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+++ autofs-5.0.7/CHANGELOG
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@@ -168,6 +168,7 @@
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- handle duplicates in multi mounts.
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- fix macro usage in lookup_program.c.
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- remove unused offset handling code.
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+- fix mount as you go offset selection.
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25/07/2012 autofs-5.0.7
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=======================
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--- autofs-5.0.7.orig/lib/cache.c
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+++ autofs-5.0.7/lib/cache.c
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@@ -1183,7 +1183,6 @@ struct mapent *cache_enumerate(struct ma
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* Get each offset from list head under prefix.
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* Maintain traversal current position in pos for subsequent calls.
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* Return each offset into offset.
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- * TODO: length check on offset.
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*/
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/* cache must be read locked by caller */
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char *cache_get_offset(const char *prefix, char *offset, int start,
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@@ -1212,6 +1211,9 @@ char *cache_get_offset(const char *prefi
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continue;
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if (!strncmp(prefix, offset_start, plen)) {
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+ struct mapent *np = NULL;
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+ char pe[PATH_MAX + 1];
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+
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/* "/" doesn't count for root offset */
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if (plen == 1)
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pstart = &offset_start[plen - 1];
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@@ -1224,7 +1226,24 @@ char *cache_get_offset(const char *prefi
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/* get next offset */
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pend = pstart;
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- while (*pend++) ;
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+ while (*pend++) {
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+ size_t nest_pt_offset;
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+
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+ if (*pend != '/')
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+ continue;
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+
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+ nest_pt_offset = start + pend - pstart;
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+ if (plen > 1)
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+ nest_pt_offset += plen;
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+ strcpy(pe, this->key);
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+ pe[nest_pt_offset] = '\0';
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+
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+ np = cache_lookup_distinct(this->mc, pe);
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+ if (np)
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+ break;
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+ }
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+ if (np)
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+ continue;
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len = pend - pstart - 1;
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strncpy(offset, pstart, len);
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offset[len] ='\0';
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@@ -1257,7 +1276,9 @@ char *cache_get_offset(const char *prefi
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break;
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/* compare offset */
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- if (pstart[len] != '/' || strncmp(offset, pstart, len))
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+ if (pstart[len] != '/' ||
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+ strlen(pstart) != len ||
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+ strncmp(offset, pstart, len))
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break;
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*pos = next;
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