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[linux-drm-fsl-dcu.git] / fs / coredump.c

diff --git a/fs/coredump.c b/fs/coredump.c
index b3c153ca435d24fdbdfcb909228b6b4787bb63f2..9ea87e9fdccf6e8c26350b7bce598562295eacb9 100644 (file)
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -118,6 +118,26 @@ int cn_esc_printf(struct core_name *cn, const char *fmt, ...)
        ret = cn_vprintf(cn, fmt, arg);
        va_end(arg);
 
+       if (ret == 0) {
+               /*
+                * Ensure that this coredump name component can't cause the
+                * resulting corefile path to consist of a ".." or ".".
+                */
+               if ((cn->used - cur == 1 && cn->corename[cur] == '.') ||
+                               (cn->used - cur == 2 && cn->corename[cur] == '.'
+                               && cn->corename[cur+1] == '.'))
+                       cn->corename[cur] = '!';
+
+               /*
+                * Empty names are fishy and could be used to create a "//" in a
+                * corefile name, causing the coredump to happen one directory
+                * level too high. Enforce that all components of the core
+                * pattern are at least one character long.
+                */
+               if (cn->used == cur)
+                       ret = cn_printf(cn, "!");
+       }
+
        for (; cur < cn->used; ++cur) {
                if (cn->corename[cur] == '/')
                        cn->corename[cur] = '!';