kprobes: Support probing __init and __exit functions in modules
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- v1 Latest7 patches 13 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/7 | module: Add within_module_core() and within_module_init()include/ kernel/ | +22 | 1 reply | |
| 2/7 | kprobes: Add kprobe_insn_mutex and cleanup arch_remove_kprobe()arch/ arch/ arch/ +4 more | +38 | 3 replies | |
| 3/7 | kprobes: Add __kprobes to kprobe internal functionskernel/ | +9 | 1 reply | |
| 4/7 | kprobes: Support probing module __exit functionDocumentation/ include/ kernel/ | +123 | 3 replies | |
| 5/7 | kprobes: Remove called_from argumentkernel/ | +14 | 3 replies | |
| 6/7 | module: Add MODULE_STATE_LIVE notifykernel/ | +2 | 1 reply | |
| 7/7 | kprobes: Support probing module __init functionkernel/ | +19 | 1 reply |
Reviews trailers per patch
5 of 7 patches have a Reviewed-by or Acked-by.
| Patch | Masami Hiramatsu | Ananth N Mavinakayanahalli |
|---|---|---|
| 1/7 | ||
| 2/7 | A-b | |
| 3/7 | A-b | |
| 4/7 | A-b | |
| 5/7 | A-b | A-b |
| 6/7 | ||
| 7/7 | A-b |
Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.
Cover letter [PATCH 0/7] kprobes: Support probing __init and __exit functions in modules
Hi,
This series of patches allows kprobes to probe module's __init and __exit functions. This means, you can probe driver initialization and terminating.
Currently, kprobes can't probe __init function because these functions are freed after module initialization. And it also can't probe module __exit functions because kprobe increments reference count of target module and user can't unload it. this means __exit functions never be called unless removing probes from the module.
To solve both cases, this series of patches introduces GONE flag and sets it when the target code is freed(for this purpose, kprobes hooks MODULE_STATE_* events). This also removes refcount incrementing for allowing user to unload target module. Users can check which probes are GONE by debugfs interface. For taking timing of freeing module's .init text, these also include a patch which adds module's notifier of MODULE_STATE_LIVE event.
This series of patches can be applied after applying below patches on 2.6.28-rc4.
http://lkml.org/lkml/2008/11/6/236
http://lkml.org/lkml/2008/11/5/346
Thank you,
Documentation/kprobes.txt | 5 arch/arm/kernel/kprobes.c | 2 arch/ia64/kernel/kprobes.c | 8 - arch/powerpc/kernel/kprobes.c | 7 - arch/s390/kernel/kprobes.c | 7 - arch/x86/kernel/kprobes.c | 7 - include/linux/kprobes.h | 15 +- include/linux/module.h | 12 + kernel/kprobes.c | 260 ++++++++++++++++++++++++++---------------- kernel/module.c | 27 +--- 10 files changed, 220 insertions(+), 130 deletions(-)
Signature · 7 lines
Masami Hiramatsu Software Engineer Hitachi Computer Products (America) Inc. Software Solutions Division e-mail: [email protected]