Opened 11 years ago
Closed 11 years ago
#511 closed defect (invalid)
Shared Memory Add Segfaults on Small Sizes
Reported by: | Scott | Owned by: | |
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Priority: | minor | Milestone: | |
Component: | nginx-core | Version: | 1.5.x |
Keywords: | Cc: | ||
uname -a: | Darwin ... 13.0.0 Darwin Kernel Version 13.0.0: Thu Sep 19 22:22:27 PDT 2013; root:xnu-2422.1.72~6/RELEASE_X86_64 x86_64 | ||
nginx -V: |
nginx version: nginx/1.5.7
built by clang 5.0 (clang-500.2.79) (based on LLVM 3.3svn) configure arguments: --without-http_rewrite_module --prefix=... --add-module=... |
Description
If I call ngx_shared_memory_add() from within a module directive's custom set method with a size of less than 120 but greater than 0 I get a segmentation fault at ngx_slab.c:111 (assumedly because pages is very large).
Change History (2)
comment:1 by , 11 years ago
comment:2 by , 11 years ago
Resolution: | → invalid |
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Status: | new → closed |
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120 is the size of
ngx_slab_pool_t
which is located at the top of shared memory. If you specify size less than it,size
will be "negative" (extra large). Usually the code in nginx limits the minimum shmem size to several memory pages.