From 633e2f7f3d88df6427aa3a7a984d3a6b796d9611 Mon Sep 17 00:00:00 2001 From: Florian Weimer Date: Thu, 14 Dec 2017 15:05:57 +0100 Subject: elf: Count components of the expanded path in _dl_init_path [BZ #22607] (cherry picked from commit 3ff3dfa5af313a6ea33f3393916f30eece4f0171) --- ChangeLog | 7 +++++++ NEWS | 6 ++++++ elf/dl-load.c | 13 ++++--------- 3 files changed, 17 insertions(+), 9 deletions(-) diff --git a/ChangeLog b/ChangeLog index 772b96ee42..55a17414ab 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,10 @@ +2017-12-14 Florian Weimer + + [BZ #22607] + CVE-2017-1000409 + * elf/dl-load.c (_dl_init_paths): Compute number of components in + the expanded path string. + 2017-12-14 Florian Weimer [BZ #22606] diff --git a/NEWS b/NEWS index 437b9ee00f..2c49212cb5 100644 --- a/NEWS +++ b/NEWS @@ -49,6 +49,12 @@ Security related changes: it is mentioned here only because of the CVE assignment.) Reported by Qualys. + CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation + of the number of search path components. (This is not a security + vulnerability per se because no trust boundary is crossed if the fix for + CVE-2017-1000366 has been applied, but it is mentioned here only because + of the CVE assignment.) Reported by Qualys. + The following bugs are resolved with this release: [16750] ldd: Never run file directly. diff --git a/elf/dl-load.c b/elf/dl-load.c index b3b0b37bf9..621403c05f 100644 --- a/elf/dl-load.c +++ b/elf/dl-load.c @@ -776,8 +776,6 @@ _dl_init_paths (const char *llp) if (llp != NULL && *llp != '\0') { - size_t nllp; - const char *cp = llp; char *llp_tmp; #ifdef SHARED @@ -800,13 +798,10 @@ _dl_init_paths (const char *llp) /* Decompose the LD_LIBRARY_PATH contents. First determine how many elements it has. */ - nllp = 1; - while (*cp) - { - if (*cp == ':' || *cp == ';') - ++nllp; - ++cp; - } + size_t nllp = 1; + for (const char *cp = llp_tmp; *cp != '\0'; ++cp) + if (*cp == ':' || *cp == ';') + ++nllp; env_path_list.dirs = (struct r_search_path_elem **) malloc ((nllp + 1) * sizeof (struct r_search_path_elem *)); -- cgit v1.2.1