evin/ms-nfs41-client
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symlink: limit symlink depth to avoid following cyclical links

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/* msdn: There is a maximum of 31 reparse points (and
 * therefore symbolic links) allowed in a particular path. */
#define NFS41_MAX_SYMLINK_DEPTH     31

also added checks for the return value of nfs41_symlink_target() on open/link/rename

Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
This commit is contained in:
Casey Bodley 2010-10-15 16:08:16 -04:00 • committed by unknown
parent 59526ba9d8
commit 870b389e8f
4 changed files with 41 additions and 0 deletions
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11
daemon/open.c
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@ -237,11 +237,22 @@ int handle_open(nfs41_upcall *upcall)
&state->path, &state->parent, &state->file, &info, &state->session);
if (status == ERROR_REPARSE) {
uint32_t depth = 0;
/* one of the parent components was a symlink */
do {
if (++depth > NFS41_MAX_SYMLINK_DEPTH) {
status = ERROR_TOO_MANY_LINKS;
goto out_free_state;
}
/* replace the path with the symlink target's */
status = nfs41_symlink_target(state->session,
&state->parent, &state->path);
if (status) {
/* can't do the reparse if we can't get the target */
eprintf("nfs41_symlink_target() failed with %d\n", status);
goto out_free_state;
}
/* redo the lookup until it doesn't return REPARSE */
status = nfs41_lookup(args->root, state->session,