Commit-ID: 0b1c723d0bd199300a1a2de57a46000d17577498
Gitweb: http://git.kernel.org/tip/0b1c723d0bd199300a1a2de57a46000d17577498
Author: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
AuthorDate: Sat, 14 Mar 2009 23:19:38 -0700
Commit: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
CommitDate: Tue, 17 Mar 2009 12:56:52 -0700
x86/brk: make the brk reservation symbols inaccessible from C
Impact: bulletproofing, clarification
The brk reservation symbols are just there to document the amount
of space reserved by brk users in the final vmlinux file. Their
addresses are irrelevent, and using their addresses will cause
certain havok. Name them ".brk.NAME", which is a valid asm symbol
but C can't reference it; it also highlights their special
role in the symbol table.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
---
arch/x86/include/asm/setup.h | 10 +++++-----
1 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
index 61b126b..fbf0521 100644
--- a/arch/x86/include/asm/setup.h
+++ b/arch/x86/include/asm/setup.h
@@ -116,13 +116,13 @@ void *extend_brk(size_t size, size_t align);
* executable.)
*/
#define RESERVE_BRK(name,sz) \
- static void __section(.discard) __used \
+ static void __section(.discard) __used \
__brk_reservation_fn_##name##__(void) { \
asm volatile ( \
".pushsection .brk_reservation,\"aw\",@nobits;" \
- "__brk_reservation_" #name "__:" \
+ ".brk." #name ":" \
" 1:.skip %c0;" \
- " .size __brk_reservation_" #name "__, . - 1b;" \
+ " .size .brk." #name ", . - 1b;" \
" .popsection" \
: : "i" (sz)); \
}
@@ -141,9 +141,9 @@ void __init x86_64_start_reservations(char *real_mode_data);
#else
#define RESERVE_BRK(name,sz) \
.pushsection .brk_reservation,"aw",@nobits; \
-__brk_reservation_##name##__: \
+.brk.name: \
1: .skip sz; \
- .size __brk_reservation_##name##__,.-1b; \
+ .size .brk.name,.-1b; \
.popsection
#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */
--
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