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authorRich Felker <dalias@aerifal.cx>2015-04-23 18:51:02 -0400
committerRich Felker <dalias@aerifal.cx>2015-04-23 18:51:02 -0400
commitabead1be6d4a303037ee65a4009c59e5b5fe0a82 (patch)
tree1bce96044564e5b7f7ecbaa6730c034235d4e79a
parent23129ab8d5f86927aad4f67c1820362acce09c45 (diff)
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fix misalignment of dtv in static-linked programs with odd-sized TLS
both static and dynamic linked versions of the __copy_tls function
have a hidden assumption that the alignment of the beginning or end of
the memory passed is suitable for storing an array of pointers for the
dtv. pthread_create satisfies this requirement except when
libc.tls_size is misaligned, which cannot happen with dynamic linking
due to way update_tls_size computes the total size, but could happen
with static linking and odd-sized TLS.
-rw-r--r--src/env/__init_tls.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/env/__init_tls.c b/src/env/__init_tls.c
index b4df2ba5..73551e6c 100644
--- a/src/env/__init_tls.c
+++ b/src/env/__init_tls.c
@@ -95,7 +95,8 @@ void __init_tls(size_t *aux)
 	T.size += (-T.size - (uintptr_t)T.image) & (T.align-1);
 	if (T.align < MIN_TLS_ALIGN) T.align = MIN_TLS_ALIGN;
 
-	libc.tls_size = 2*sizeof(void *)+T.size+T.align+sizeof(struct pthread);
+	libc.tls_size = 2*sizeof(void *)+T.size+T.align+sizeof(struct pthread)
+		+ MIN_TLS_ALIGN-1 & -MIN_TLS_ALIGN;
 
 	if (libc.tls_size > sizeof builtin_tls) {
 #ifndef SYS_mmap2