Package: libcap-ng0 Version: 0.6.6-1 Followup-For: Bug #631807 memset usage to reset the structure to 0 and NULL is indeed the culprit. Here is a patch that fix the bug. I made it after reading: http://ex-parrot.com/~chris/random/initialise.html as I clued that being pedantic could help and it did. Sadly I found no pointer telling about the rationale for why only on armel does it fail. Thus all I can tell here is the memset hack breaks on an address-of on a no basic type field of a __thread structure.
The patch is against src/cap-ng.c from libcap-ng 0.6.6 I tested the libcap-ng-utils on armel and also reinstalled bluez without issues. BR, Alban -- System Information: Debian Release: wheezy/sid APT prefers unstable APT policy: (500, 'unstable'), (500, 'testing'), (1, 'experimental') Architecture: amd64 (x86_64) Kernel: Linux 3.4.0test0-03166-gf6a26ae (SMP w/2 CPU cores) Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Versions of packages libcap-ng0 depends on: ii libc6 2.13-32 libcap-ng0 recommends no packages. libcap-ng0 suggests no packages. -- no debconf information
--- cap-ng.c.nofix 2012-05-29 04:35:34.000000000 +0000 +++ cap-ng.c.fix 2012-05-29 04:35:22.000000000 +0000 @@ -136,6 +136,11 @@ __u32 bounds[2]; }; + +static struct __user_cap_header_struct hdrzz = {0, 0}; +static cap_data_t datazz = { {0, 0, 0} }; +static __u32 boundzz = {0}; + // Global variables with per thread uniqueness static __thread struct cap_ng m = { 1, {0, 0}, @@ -149,7 +154,7 @@ if (m.state != CAPNG_NEW) return; - memset(&m.hdr, 0, sizeof(m.hdr)); + m.hdr = hdrzz; (void)capget(&m.hdr, NULL); // Returns -EINVAL if (m.hdr.version == _LINUX_CAPABILITY_VERSION_3 || m.hdr.version == _LINUX_CAPABILITY_VERSION_2) { @@ -161,7 +166,7 @@ return; } - memset(&m.data, 0, sizeof(cap_data_t)); + m.data = datazz; #ifdef HAVE_SYSCALL_H m.hdr.pid = (unsigned)syscall(__NR_gettid); #else @@ -178,10 +183,13 @@ return; if (set & CAPNG_SELECT_CAPS) - memset(&m.data, 0, sizeof(cap_data_t)); + m.data = datazz; #ifdef PR_CAPBSET_DROP - if (set & CAPNG_SELECT_BOUNDS) - memset(m.bounds, 0, sizeof(m.bounds)); + if (set & CAPNG_SELECT_BOUNDS) { + unsigned i; + for (i=0; i<sizeof(m.bounds)/sizeof(__u32); i++) + m.bounds[i] = boundzz; + } #endif m.state = CAPNG_INIT; }