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authorFlorian Weimer <fweimer@redhat.com>2016-08-03 16:15:38 +0200
committerFlorian Weimer <fweimer@redhat.com>2016-08-03 16:15:38 +0200
commita2ff21f825adb8821eeb6145197fa8b9a8a60a58 (patch)
tree65f74b90eb0a005a278f80586b0ee001d358021b /csu
parent5bc17330eb7667b96fee8baf3729c3310fa28b40 (diff)
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elf: Avoid using memalign for TLS allocations [BZ #17730]
Instead of a flag which indicates the pointer can be freed, dtv_t
now includes the pointer which should be freed.  Due to padding,
the size of dtv_t does not increase.

To avoid using memalign, the new allocate_dtv_entry function
allocates a sufficiently large buffer so that a sub-buffer
can be found in it which starts with an aligned pointer.  Both
the aligned and original pointers are kept, the latter for calling
free later.
Diffstat (limited to 'csu')
-rw-r--r--csu/libc-tls.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/csu/libc-tls.c b/csu/libc-tls.c
index d6425e0189..235ac798ed 100644
--- a/csu/libc-tls.c
+++ b/csu/libc-tls.c
@@ -175,7 +175,7 @@ __libc_setup_tls (size_t tcbsize, size_t tcbalign)
 #else
 # error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
 #endif
-  _dl_static_dtv[2].pointer.is_static = true;
+  _dl_static_dtv[2].pointer.to_free = NULL;
   /* sbrk gives us zero'd memory, so we don't need to clear the remainder.  */
   memcpy (_dl_static_dtv[2].pointer.val, initimage, filesz);