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asan: support for globals in kernel

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2014-12-02  Dmitry Vyukov  <dvyukov@google.com>
* asan.c: (asan_finish_file): Use default priority for constructors
in kernel mode.

From-SVN: r218281
This commit is contained in:
Dmitry Vyukov 2014-12-02 10:58:59 -08:00 committed by Dmitry Vyukov
parent d455c0b530
commit f1d15bb914
2 changed files with 17 additions and 5 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2014-12-02 Dmitry Vyukov <dvyukov@google.com>
* asan.c: (asan_finish_file): Use default priority for constructors
in kernel mode.
2014-12-02 Ulrich Weigand <Ulrich.Weigand@de.ibm.com>
PR target/64115

17
gcc/asan.c
View File

@ -1348,7 +1348,9 @@ asan_protect_global (tree decl)
the var that is selected by the linker will have
padding or not. */
|| DECL_ONE_ONLY (decl)
/* Similarly for common vars. People can use -fno-common. */
/* Similarly for common vars. People can use -fno-common.
Note: Linux kernel is built with -fno-common, so we do instrument
globals there even if it is C. */
|| (DECL_COMMON (decl) && TREE_PUBLIC (decl))
/* Don't protect if using user section, often vars placed
into user section from multiple TUs are then assumed
@ -2448,6 +2450,13 @@ asan_finish_file (void)
nor after .LASAN* array. */
flag_sanitize &= ~SANITIZE_ADDRESS;
/* For user-space we want asan constructors to run first.
Linux kernel does not support priorities other than default, and the only
other user of constructors is coverage. So we run with the default
priority. */
int priority = flag_sanitize & SANITIZE_USER_ADDRESS
? MAX_RESERVED_INIT_PRIORITY - 1 : DEFAULT_INIT_PRIORITY;
if (flag_sanitize & SANITIZE_USER_ADDRESS)
{
tree fn = builtin_decl_implicit (BUILT_IN_ASAN_INIT);
@ -2503,12 +2512,10 @@ asan_finish_file (void)
build_fold_addr_expr (var),
gcount_tree),
&dtor_statements);
cgraph_build_static_cdtor ('D', dtor_statements,
MAX_RESERVED_INIT_PRIORITY - 1);
cgraph_build_static_cdtor ('D', dtor_statements, priority);
}
if (asan_ctor_statements)
cgraph_build_static_cdtor ('I', asan_ctor_statements,
MAX_RESERVED_INIT_PRIORITY - 1);
cgraph_build_static_cdtor ('I', asan_ctor_statements, priority);
flag_sanitize |= SANITIZE_ADDRESS;
}