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- kprobes: Fix possible use-after-free issue on kprobe registration. Since check_kprobe_address_safe() uses `is_module_text_address()` and `__module_text_address()` separately, if the probe address is on an unloading module, the first `is_module_text_address()` return true but the second `__module_text_address()` returns NULL (module is unloaded between them). Thus it expects the probe is on the kernel text, and skips to get the module reference. In this case, when it arms a breakpoint on the probe address, it may cause a use-after-free problem. To fix this issue, we only use `__module_text_address()` once and tries to get reference of the module, if it fails, reject the probe. -----BEGIN PGP SIGNATURE----- iQFPBAABCgA5FiEEh7BulGwFlgAOi5DV2/sHvwUrPxsFAmYWrOEbHG1hc2FtaS5o aXJhbWF0c3VAZ21haWwuY29tAAoJENv7B78FKz8b9ugIAKBeaLfuhoa45V/XZ+If GyIvXnmldj8e0U6fCQL58rFdzHfjUMt2X7r8sQrMgjVhRHbtE1SnKqOOi/NNMb6Z 2KOESX73xj94ohG0ydSEYP/W1QVyDByMxAIRGpmKAmAnt+7GA76iCQrcgwYirTFV okgnldJvH0RNm4xIuD4YAQMJnYXg9WJFxaA127uI/JGCzw7R4OBQ9i2PaSS4oXYr ZZhH2x+D6fcwFY5Sr5ApAcIQfvfk6IG5xLHu981r93Y/BncorIi8I4MtaZFvoWwQ SdCi85KPG1R99rok/54Lm4tfPPQa8oNMBiImIcF5iCzC/CUh6GEn5tCifefV/UmW 7i0= =PVv1 -----END PGP SIGNATURE----- Merge tag 'probes-fixes-v6.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull probes fixes from Masami Hiramatsu: "Fix possible use-after-free issue on kprobe registration. check_kprobe_address_safe() uses `is_module_text_address()` and `__module_text_address()` separately. As a result, if the probed address is in a module that is being unloaded, the first `is_module_text_address()` might return true but then the `__module_text_address()` call might return NULL if the module has been unloaded between the two. The result is that kprobe believes the probe is on the kernel text, and skips getting a module reference. In this case, when it arms a breakpoint on the probe address, it may cause a use-after-free. To fix this issue, only use `__module_text_address()` once and get a reference to the module then. If it fails, reject the probe" * tag 'probes-fixes-v6.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: kprobes: Fix possible use-after-free issue on kprobe registration |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.