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commit 758599bc9dcc5764e862bd9e1613c5d1e6efc5d3
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Wed Feb 26 15:58:23 2020 +0100
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elf: Apply attribute_relro to pointers in elf/dl-minimal.c
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The present code leaves the function pointers unprotected, but moves
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some of the static functions into .data.rel.ro instead. This causes
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the linker to produce an allocatable, executable, writable section
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and eventually an RWX load segment. Not only do we really do not
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want that, it also breaks valgrind because valgrind does not load
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debuginfo from the mmap interceptor if all it sees are RX and RWX
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mappings.
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Fixes commit 3a0ecccb599a6b1ad4b149dc569c0080e92d057b ("ld.so: Do not
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export free/calloc/malloc/realloc functions [BZ #25486]").
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diff --git a/elf/dl-minimal.c b/elf/dl-minimal.c
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index 95ea7b024044864f..4335f1bd24289b01 100644
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--- a/elf/dl-minimal.c
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+++ b/elf/dl-minimal.c
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@@ -39,16 +39,16 @@
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implementation below. Before the final relocation,
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__rtld_malloc_init_real is called to replace the pointers with the
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real implementation. */
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-__typeof (calloc) *__rtld_calloc;
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-__typeof (free) *__rtld_free;
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-__typeof (malloc) *__rtld_malloc;
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-__typeof (realloc) *__rtld_realloc;
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+__typeof (calloc) *__rtld_calloc attribute_relro;
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+__typeof (free) *__rtld_free attribute_relro;
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+__typeof (malloc) *__rtld_malloc attribute_relro;
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+__typeof (realloc) *__rtld_realloc attribute_relro;
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/* Defined below. */
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-static __typeof (calloc) rtld_calloc attribute_relro;
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-static __typeof (free) rtld_free attribute_relro;
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-static __typeof (malloc) rtld_malloc attribute_relro;
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-static __typeof (realloc) rtld_realloc attribute_relro;
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+static __typeof (calloc) rtld_calloc;
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+static __typeof (free) rtld_free;
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+static __typeof (malloc) rtld_malloc;
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+static __typeof (realloc) rtld_realloc;
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void
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__rtld_malloc_init_stubs (void)
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