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author | Rich Felker <dalias@aerifal.cx> | 2014-04-21 19:52:24 -0400 |
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committer | Rich Felker <dalias@aerifal.cx> | 2014-04-21 19:52:24 -0400 |
commit | fbcfed7c2d27496063d79e4d2a2a694d0fe67209 (patch) | |
tree | 150033b9219b57f5d61a3b7a59d908886543acb2 /src/env/__libc_start_main.c | |
parent | 9b52ab1c9a44b62236089ab0272801d049bc5b1e (diff) | |
download | musl-fbcfed7c2d27496063d79e4d2a2a694d0fe67209.tar.gz musl-fbcfed7c2d27496063d79e4d2a2a694d0fe67209.tar.bz2 musl-fbcfed7c2d27496063d79e4d2a2a694d0fe67209.tar.xz musl-fbcfed7c2d27496063d79e4d2a2a694d0fe67209.zip |
further micro-optimize startup code for size
there is no reason (and seemingly there never was any) for
__init_security to be its own function. it's linked unconditionally
so it can just be placed inline in __init_libc.
Diffstat (limited to 'src/env/__libc_start_main.c')
-rw-r--r-- | src/env/__libc_start_main.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/src/env/__libc_start_main.c b/src/env/__libc_start_main.c index 539f72e5..d7ec3abd 100644 --- a/src/env/__libc_start_main.c +++ b/src/env/__libc_start_main.c @@ -1,8 +1,11 @@ #include <elf.h> +#include <poll.h> +#include <fcntl.h> +#include "syscall.h" +#include "atomic.h" #include "libc.h" void __init_tls(size_t *); -void __init_security(size_t *); #ifndef SHARED static void dummy() {} @@ -37,7 +40,16 @@ void __init_libc(char **envp, char *pn) __init_tls(aux); __init_ssp((void *)aux[AT_RANDOM]); - __init_security(aux); + + if (aux[AT_UID]==aux[AT_EUID] && aux[AT_GID]==aux[AT_EGID] + && !aux[AT_SECURE]) return; + + struct pollfd pfd[3] = { {.fd=0}, {.fd=1}, {.fd=2} }; + __syscall(SYS_poll, pfd, 3, 0); + for (i=0; i<3; i++) if (pfd[i].revents&POLLNVAL) + if (__syscall(SYS_open, "/dev/null", O_RDWR|O_LARGEFILE)<0) + a_crash(); + libc.secure = 1; } int __libc_start_main(int (*main)(int,char **,char **), int argc, char **argv) |