path: root/libpthread/nptl/sysdeps
diff options
authorChristophe Lyon <>2018-07-04 15:55:38 (GMT)
committerWaldemar Brodkorb <>2018-08-10 14:02:45 (GMT)
commit13fcd46ea7d2d93858061748d6428b900150f6ad (patch)
treed2b2fd5c5553ae759abdca6df97ae48edf8afb99 /libpthread/nptl/sysdeps
parent606a8b28e4987e09572dd0c6b40546cdcbcc1bf7 (diff)
nptl: Clear TLS area for static binaries.
busybox init checks it has pid 1, but getpid() returns another value when building busybox statically. This is because the corresponding area is not cleared when allocated (it is allocated with MAP_UNINITIALIZED, whose behavior depends on the Linux kernel's CONFIG_MMAP_ALLOW_UNINITIALIZED). This patch fixes the problem by explicitly clearing the memory area. * libpthread/nptl/sysdeps/generic/libc-tls.c (__libc_tls_setup): Clear tlsblock. Signed-off-by: Mickaël Guêné <> Signed-off-by: Christophe Lyon <>
Diffstat (limited to 'libpthread/nptl/sysdeps')
1 files changed, 1 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/generic/libc-tls.c b/libpthread/nptl/sysdeps/generic/libc-tls.c
index 725f3df..5f89c91 100644
--- a/libpthread/nptl/sysdeps/generic/libc-tls.c
+++ b/libpthread/nptl/sysdeps/generic/libc-tls.c
@@ -162,6 +162,7 @@ __libc_setup_tls (size_t tcbsize, size_t tcbalign)
tcb_offset = roundup (tcbsize, align ?: 1);
tlsblock = sbrk (tcb_offset + memsz + max_align
+ TLS_PRE_TCB_SIZE + GL(dl_tls_static_size));
+ memset(tlsblock, '\0', tcb_offset + memsz + max_align + TLS_PRE_TCB_SIZE + GL(dl_tls_static_size));
tlsblock += TLS_PRE_TCB_SIZE;
# else
/* In case a model with a different layout for the TCB and DTV