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55c49fee |
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02-Jan-2024 |
Baoquan He <bhe@redhat.com> |
mm/vmalloc: remove vmap_area_list Earlier, vmap_area_list is exported to vmcoreinfo so that makedumpfile get the base address of vmalloc area. Now, vmap_area_list is empty, so export VMALLOC_START to vmcoreinfo instead, and remove vmap_area_list. [urezki@gmail.com: fix a warning in the crash_save_vmcoreinfo_init()] Link: https://lkml.kernel.org/r/20240111192329.449189-1-urezki@gmail.com Link: https://lkml.kernel.org/r/20240102184633.748113-6-urezki@gmail.com Signed-off-by: Baoquan He <bhe@redhat.com> Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com> Acked-by: Lorenzo Stoakes <lstoakes@gmail.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Dave Chinner <david@fromorbit.com> Cc: Joel Fernandes (Google) <joel@joelfernandes.org> Cc: Kazuhito Hagio <k-hagio-ab@nec.com> Cc: Liam R. Howlett <Liam.Howlett@oracle.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Oleksiy Avramchenko <oleksiy.avramchenko@sony.com> Cc: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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33c24bee |
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24-Aug-2023 |
Kees Cook <keescook@chromium.org> |
kallsyms: Add more debug output for selftest While debugging a recent kallsyms_selftest failure[1], I needed more details on what specifically was failing. This adds those details for each failure state that is checked. [1] https://lore.kernel.org/all/202308232200.1c932a90-oliver.sang@intel.com/ Cc: Luis Chamberlain <mcgrof@kernel.org> Cc: Yonghong Song <yhs@meta.com> Cc: "Erhard F." <erhard_f@mailbox.org> Cc: Zhen Lei <thunder.leizhen@huawei.com> Cc: kernel test robot <oliver.sang@intel.com> Cc: Petr Mladek <pmladek@suse.com> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Yang Li <yang.lee@linux.alibaba.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
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33f0467f |
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24-Aug-2023 |
Yonghong Song <yonghong.song@linux.dev> |
kallsyms: Fix kallsyms_selftest failure Kernel test robot reported a kallsyms_test failure when clang lto is enabled (thin or full) and CONFIG_KALLSYMS_SELFTEST is also enabled. I can reproduce in my local environment with the following error message with thin lto: [ 1.877897] kallsyms_selftest: Test for 1750th symbol failed: (tsc_cs_mark_unstable) addr=ffffffff81038090 [ 1.877901] kallsyms_selftest: abort It appears that commit 8cc32a9bbf29 ("kallsyms: strip LTO-only suffixes from promoted global functions") caused the failure. Commit 8cc32a9bbf29 changed cleanup_symbol_name() based on ".llvm." instead of '.' where ".llvm." is appended to a before-lto-optimization local symbol name. We need to propagate such knowledge in kallsyms_selftest.c as well. Further more, compare_symbol_name() in kallsyms.c needs change as well. In scripts/kallsyms.c, kallsyms_names and kallsyms_seqs_of_names are used to record symbol names themselves and index to symbol names respectively. For example: kallsyms_names: ... __amd_smn_rw._entry <== seq 1000 __amd_smn_rw._entry.5 <== seq 1001 __amd_smn_rw.llvm.<hash> <== seq 1002 ... kallsyms_seqs_of_names are sorted based on cleanup_symbol_name() through, so the order in kallsyms_seqs_of_names actually has index 1000: seq 1002 <== __amd_smn_rw.llvm.<hash> (actual symbol comparison using '__amd_smn_rw') index 1001: seq 1000 <== __amd_smn_rw._entry index 1002: seq 1001 <== __amd_smn_rw._entry.5 Let us say at a particular point, at index 1000, symbol '__amd_smn_rw.llvm.<hash>' is comparing to '__amd_smn_rw._entry' where '__amd_smn_rw._entry' is the one to search e.g., with function kallsyms_on_each_match_symbol(). The current implementation will find out '__amd_smn_rw._entry' is less than '__amd_smn_rw.llvm.<hash>' and then continue to search e.g., index 999 and never found a match although the actual index 1001 is a match. To fix this issue, let us do cleanup_symbol_name() first and then do comparison. In the above case, comparing '__amd_smn_rw' vs '__amd_smn_rw._entry' and '__amd_smn_rw._entry' being greater than '__amd_smn_rw', the next comparison will be > index 1000 and eventually index 1001 will be hit an a match is found. For any symbols not having '.llvm.' substr, there is no functionality change for compare_symbol_name(). Fixes: 8cc32a9bbf29 ("kallsyms: strip LTO-only suffixes from promoted global functions") Reported-by: kernel test robot <oliver.sang@intel.com> Closes: https://lore.kernel.org/oe-lkp/202308232200.1c932a90-oliver.sang@intel.com Signed-off-by: Yonghong Song <yonghong.song@linux.dev> Reviewed-by: Song Liu <song@kernel.org> Reviewed-by: Zhen Lei <thunder.leizhen@huawei.com> Link: https://lore.kernel.org/r/20230825034659.1037627-1-yonghong.song@linux.dev Cc: stable@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org>
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3703bd54 |
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08-Mar-2023 |
Zhen Lei <thunder.leizhen@huawei.com> |
kallsyms: Delete an unused parameter related to {module_}kallsyms_on_each_symbol() The parameter 'struct module *' in the hook function associated with {module_}kallsyms_on_each_symbol() is no longer used. Delete it. Suggested-by: Petr Mladek <pmladek@suse.com> Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Reviewed-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
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da35048f |
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12-Jan-2023 |
Nicholas Piggin <npiggin@gmail.com> |
kallsyms: Fix scheduling with interrupts disabled in self-test kallsyms_on_each* may schedule so must not be called with interrupts disabled. The iteration function could disable interrupts, but this also changes lookup_symbol() to match the change to the other timing code. Reported-by: Erhard F. <erhard_f@mailbox.org> Link: https://lore.kernel.org/all/bug-216902-206035@https.bugzilla.kernel.org%2F/ Reported-by: kernel test robot <oliver.sang@intel.com> Link: https://lore.kernel.org/oe-lkp/202212251728.8d0872ff-oliver.sang@intel.com Fixes: 30f3bb09778d ("kallsyms: Add self-test facility") Tested-by: "Erhard F." <erhard_f@mailbox.org> Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
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c86a514f |
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17-Nov-2022 |
Yang Li <yang.lee@linux.alibaba.com> |
kallsyms: Remove unneeded semicolon ./kernel/kallsyms_selftest.c:136:2-3: Unneeded semicolon Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=3208 Reported-by: Abaci Robot <abaci@linux.alibaba.com> Signed-off-by: Yang Li <yang.lee@linux.alibaba.com> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
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30f3bb09 |
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15-Nov-2022 |
Zhen Lei <thunder.leizhen@huawei.com> |
kallsyms: Add self-test facility Added test cases for basic functions and performance of functions kallsyms_lookup_name(), kallsyms_on_each_symbol() and kallsyms_on_each_match_symbol(). It also calculates the compression rate of the kallsyms compression algorithm for the current symbol set. The basic functions test begins by testing a set of symbols whose address values are known. Then, traverse all symbol addresses and find the corresponding symbol name based on the address. It's impossible to determine whether these addresses are correct, but we can use the above three functions along with the addresses to test each other. Due to the traversal operation of kallsyms_on_each_symbol() is too slow, only 60 symbols can be tested in one second, so let it test on average once every 128 symbols. The other two functions validate all symbols. If the basic functions test is passed, print only performance test results. If the test fails, print error information, but do not perform subsequent performance tests. Start self-test automatically after system startup if CONFIG_KALLSYMS_SELFTEST=y. Example of output content: (prefix 'kallsyms_selftest:' is omitted start --------------------------------------------------------- | nr_symbols | compressed size | original size | ratio(%) | |---------------------------------------------------------| | 107543 | 1357912 | 2407433 | 56.40 | --------------------------------------------------------- kallsyms_lookup_name() looked up 107543 symbols The time spent on each symbol is (ns): min=630, max=35295, avg=7353 kallsyms_on_each_symbol() traverse all: 11782628 ns kallsyms_on_each_match_symbol() traverse all: 9261 ns finish Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
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