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author | Rich Felker <dalias@aerifal.cx> | 2012-04-24 18:07:59 -0400 |
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committer | Rich Felker <dalias@aerifal.cx> | 2012-04-24 18:07:59 -0400 |
commit | 60872cf9c93687e771c1b8bc41bb006bdcdc2e45 (patch) | |
tree | 5a90330df6f08de109d0f4f58347dbec642cbff6 /src/env/__init_security.c | |
parent | 848d30a1e5f75988be4b291a431713e78ae09f79 (diff) | |
download | musl-60872cf9c93687e771c1b8bc41bb006bdcdc2e45.tar.gz musl-60872cf9c93687e771c1b8bc41bb006bdcdc2e45.tar.bz2 musl-60872cf9c93687e771c1b8bc41bb006bdcdc2e45.tar.xz musl-60872cf9c93687e771c1b8bc41bb006bdcdc2e45.zip |
first attempt at enabling stack protector support
the code is written to pre-init the thread pointer in static linked
programs that pull in __stack_chk_fail or dynamic-linked programs that
lookup the symbol. no explicit canary is set; the canary will be
whatever happens to be in the thread structure at the offset gcc
hard-coded. this can be improved later.
Diffstat (limited to 'src/env/__init_security.c')
-rw-r--r-- | src/env/__init_security.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/env/__init_security.c b/src/env/__init_security.c index 5fd12ecb..6893a252 100644 --- a/src/env/__init_security.c +++ b/src/env/__init_security.c @@ -8,11 +8,18 @@ #define AUX_CNT 24 +void dummy(void) +{ +} +weak_alias(dummy, __init_ssp); + void __init_security(size_t *auxv) { size_t i, aux[AUX_CNT] = { 0 }; struct pollfd pfd[3] = { {.fd=0}, {.fd=1}, {.fd=2} }; + __init_ssp(); + for (; auxv[0]; auxv+=2) if (auxv[0]<AUX_CNT) aux[auxv[0]] = auxv[1]; if (aux[AT_UID]==aux[AT_EUID] && aux[AT_GID]==aux[AT_EGID] && !aux[AT_SECURE]) return; |