From: Catalin Marinas <[email protected]>
This patch handles the kmemleak operations needed for modules loading so
that memory allocations from inside a module are properly tracked.
Signed-off-by: Catalin Marinas <[email protected]>
---
kernel/module.c | 41 +++++++++++++++++++++++++++++++++++++++++
1 files changed, 41 insertions(+), 0 deletions(-)
diff --git a/kernel/module.c b/kernel/module.c
index 35e1b1f..3b88c06 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1481,6 +1481,11 @@ static struct module *load_module(void _
unsigned int unusedcrcindex;
unsigned int unusedgplindex;
unsigned int unusedgplcrcindex;
+#ifdef CONFIG_DEBUG_MEMLEAK
+ unsigned int dataindex;
+ unsigned int bssindex;
+ unsigned int mloffindex;
+#endif
struct module *mod;
long err = 0;
void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
@@ -1577,6 +1582,11 @@ #endif
#ifdef ARCH_UNWIND_SECTION_NAME
unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME);
#endif
+#ifdef CONFIG_DEBUG_MEMLEAK
+ dataindex = find_sec(hdr, sechdrs, secstrings, ".data");
+ bssindex = find_sec(hdr, sechdrs, secstrings, ".bss");
+ mloffindex = find_sec(hdr, sechdrs, secstrings, ".init.memleak_offsets");
+#endif
/* Don't keep modinfo section */
sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
@@ -1646,6 +1656,10 @@ #endif
/* Do the allocs. */
ptr = module_alloc(mod->core_size);
+ /* the pointer to this block is stored in the module structure
+ * which is inside the block. Just mark it as not being a
+ * leak */
+ memleak_not_leak(ptr);
if (!ptr) {
err = -ENOMEM;
goto free_percpu;
@@ -1654,6 +1668,11 @@ #endif
mod->module_core = ptr;
ptr = module_alloc(mod->init_size);
+ /* the pointer to this block is stored in the module structure
+ * which is inside the block. This block doesn't need to be
+ * scanned as it contains data and code that will be freed
+ * after the module is initialized */
+ memleak_ignore(ptr);
if (!ptr && mod->init_size) {
err = -ENOMEM;
goto free_core;
@@ -1685,6 +1704,28 @@ #endif
/* Module has been moved. */
mod = (void *)sechdrs[modindex].sh_addr;
+#ifdef CONFIG_DEBUG_MEMLEAK
+ if (mloffindex)
+ memleak_insert_aliases((void *)sechdrs[mloffindex].sh_addr,
+ (void *)sechdrs[mloffindex].sh_addr
+ + sechdrs[mloffindex].sh_size);
+
+ /* only scan the sections containing data */
+ memleak_scan_area(mod->module_core,
+ (unsigned long)mod - (unsigned long)mod->module_core,
+ sizeof(struct module));
+ if (dataindex)
+ memleak_scan_area(mod->module_core,
+ sechdrs[dataindex].sh_addr
+ - (unsigned long)mod->module_core,
+ sechdrs[dataindex].sh_size);
+ if (bssindex)
+ memleak_scan_area(mod->module_core,
+ sechdrs[bssindex].sh_addr
+ - (unsigned long)mod->module_core,
+ sechdrs[bssindex].sh_size);
+#endif
+
/* Now we've moved module, initialize linked lists, etc. */
module_unload_init(mod);
-
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