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Kmemleak now scans all the writable and non-executable module sections

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to avoid false positives (previously it was only scanning specific
 sections and missing .ref.data).
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Merge tag 'kmemleak-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64

Pull kmemleak patches from Catalin Marinas:
 "Kmemleak now scans all the writable and non-executable module sections
  to avoid false positives (previously it was only scanning specific
  sections and missing .ref.data)."

* tag 'kmemleak-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64:
  kmemleak: No need for scanning specific module sections
  kmemleak: Scan all allocated, writeable and not executable module sections
This commit is contained in:
Linus Torvalds 2013-05-18 10:21:32 -07:00
commit 8f05bde9bd
1 changed files with 4 additions and 17 deletions
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21
kernel/module.c
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@ -2431,10 +2431,10 @@ static void kmemleak_load_module(const struct module *mod,
kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
for (i = 1; i < info->hdr->e_shnum; i++) {
const char *name = info->secstrings + info->sechdrs[i].sh_name;
if (!(info->sechdrs[i].sh_flags & SHF_ALLOC))
continue;
if (!strstarts(name, ".data") && !strstarts(name, ".bss"))
/* Scan all writable sections that's not executable */
if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) ||
!(info->sechdrs[i].sh_flags & SHF_WRITE) ||
(info->sechdrs[i].sh_flags & SHF_EXECINSTR))
continue;
kmemleak_scan_area((void *)info->sechdrs[i].sh_addr,
@ -2769,24 +2769,11 @@ static void find_module_sections(struct module *mod, struct load_info *info)
mod->trace_events = section_objs(info, "_ftrace_events",
sizeof(*mod->trace_events),
&mod->num_trace_events);
/*
* This section contains pointers to allocated objects in the trace
* code and not scanning it leads to false positives.
*/
kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
mod->num_trace_events, GFP_KERNEL);
#endif
#ifdef CONFIG_TRACING
mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt",
sizeof(*mod->trace_bprintk_fmt_start),
&mod->num_trace_bprintk_fmt);
/*
* This section contains pointers to allocated objects in the trace
* code and not scanning it leads to false positives.
*/
kmemleak_scan_area(mod->trace_bprintk_fmt_start,
sizeof(*mod->trace_bprintk_fmt_start) *
mod->num_trace_bprintk_fmt, GFP_KERNEL);
#endif
#ifdef CONFIG_FTRACE_MCOUNT_RECORD
/* sechdrs[0].sh_size is always zero */