35 lines
2.3 KiB
Plaintext
35 lines
2.3 KiB
Plaintext
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PURPOSE of /tools/binutils/Regression/RELRO-protection-effective
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Description: bz1174826
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Author: Martin Cermak <mcermak@redhat.com>
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Bug summary: RELRO is not read-only on PowerLE
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Bugzilla link: https://bugzilla.redhat.com/show_bug.cgi?id=1174826
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/*
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* Test to exercise PIE and RELRO provided by Roland McGrath <roland@redhat.com>.
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*
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* Description:
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* Simple test for RELRO, which happens to be a PIE too, but that's only
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* because this kind of example has to be in PIC code to make RELRO relevant,
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* and PIE makes it simpler to write a standalone one-file test than writing
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* a DSO.
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*
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* The "const" makes "foo" .rodata material, and the init to an external symbol
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* reference makes it require a data relocation. Enabling -z relro for this
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* link puts that .rodata into a RELRO area. This program will crash because
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* the page containing "foo" has been made read-only when "main" runs.
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* Without RELRO, it would let you modify "foo" even though it's supposed to
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* be const.
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*
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* Test with RELRO should fail:
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* $ gcc -pie -fPIE -g -Wl,-z,relro -o relro relro.c
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* $ ./relro
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* Segmentation fault (core dumped)
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*
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* Test without RELRO should pass:
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* $ gcc -pie -fPIE -g -Wl,-z,norelro -o no-relro relro.c
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* $ ./no-relro
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*
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**/
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