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mm: kmemleak: scan .data.ro_after_init

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Limit the number of kmemleak false positives by including
.data.ro_after_init in memory scanning.  To achieve this we need to add
symbols for start and end of the section to the linker scripts.

The problem was been uncovered by commit 56989f6d85 ("genetlink: mark
families as __ro_after_init").

Link: http://lkml.kernel.org/r/[email protected]
Reviewed-by: Catalin Marinas <[email protected]>
Signed-off-by: Jakub Kicinski <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Cong Wang <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Heiko Carstens <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jakub Kicinski authored and Linus Torvalds committed 2016-11-11 08:12:37 -08:00
1 parent f773e36de3
commit d7c19b066d
4 files changed
+10 -1
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arch/s390/kernel/vmlinux.lds.S
+2
View File
@@ -62,9 +62,11 @@ SECTIONS
. = ALIGN(PAGE_SIZE);
__start_ro_after_init = .;
__start_data_ro_after_init = .;
.data..ro_after_init : {
*(.data..ro_after_init)
}
__end_data_ro_after_init = .;
EXCEPTION_TABLE(16)
. = ALIGN(PAGE_SIZE);
__end_ro_after_init = .;
include/asm-generic/sections.h
+3
View File
@@ -14,6 +14,8 @@
* [_sdata, _edata]: contains .data.* sections, may also contain .rodata.*
* and/or .init.* sections.
* [__start_rodata, __end_rodata]: contains .rodata.* sections
* [__start_data_ro_after_init, __end_data_ro_after_init]:
* contains data.ro_after_init section
* [__init_begin, __init_end]: contains .init.* sections, but .init.text.*
* may be out of this range on some architectures.
* [_sinittext, _einittext]: contains .init.text.* sections
@@ -31,6 +33,7 @@ extern char _data[], _sdata[], _edata[];
extern char __bss_start[], __bss_stop[];
extern char __init_begin[], __init_end[];
extern char _sinittext[], _einittext[];
extern char __start_data_ro_after_init[], __end_data_ro_after_init[];
extern char _end[];
extern char __per_cpu_load[], __per_cpu_start[], __per_cpu_end[];
extern char __kprobes_text_start[], __kprobes_text_end[];
include/asm-generic/vmlinux.lds.h
+4 -1
View File
@@ -259,7 +259,10 @@
* own by defining an empty RO_AFTER_INIT_DATA.
*/
#ifndef RO_AFTER_INIT_DATA
#define RO_AFTER_INIT_DATA *(.data..ro_after_init)
#define RO_AFTER_INIT_DATA \
__start_data_ro_after_init = .; \
*(.data..ro_after_init) \
__end_data_ro_after_init = .;
#endif
/*
mm/kmemleak.c
+1
View File
@@ -1414,6 +1414,7 @@ static void kmemleak_scan(void)
/* data/bss scanning */
scan_large_block(_sdata, _edata);
scan_large_block(__bss_start, __bss_stop);
scan_large_block(__start_data_ro_after_init, __end_data_ro_after_init);
#ifdef CONFIG_SMP
/* per-cpu sections scanning */