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The first segment in a shared library may be read-only, not executable. To support LD_PREFER_MAP_32BIT_EXEC on such shared libraries, we also check MAP_DENYWRITE to decide if MAP_32BIT should be passed to mmap. Normally the first segment is mapped with MAP_COPY, which is defined as (MAP_PRIVATE | MAP_DENYWRITE). But if the segment alignment is greater than the page size, MAP_COPY isn't used to allocate enough space to ensure that the segment can be properly aligned. Map the first segment with MAP_COPY in this case to fix BZ #30452.
30 lines
873 B
Makefile
30 lines
873 B
Makefile
ifeq ($(subdir),elf)
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tests-map-32bit = \
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tst-map-32bit-1a \
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tst-map-32bit-1b \
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tst-map-32bit-2 \
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# tests-map-32bit
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tst-map-32bit-1a-no-pie = yes
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tst-map-32bit-1b-no-pie = yes
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tst-map-32bit-2-no-pie = yes
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tests += $(tests-map-32bit)
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modules-map-32bit = \
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tst-map-32bit-mod \
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tst-map-32bit-mod-2 \
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# modules-map-32bit
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modules-names += $(modules-map-32bit)
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$(objpfx)tst-map-32bit-mod.so: $(libsupport)
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tst-map-32bit-1a-ENV = LD_PREFER_MAP_32BIT_EXEC=1
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$(objpfx)tst-map-32bit-1a: $(objpfx)tst-map-32bit-mod.so
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tst-map-32bit-1b-ENV = GLIBC_TUNABLES=glibc.cpu.prefer_map_32bit_exec=1
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$(objpfx)tst-map-32bit-1b: $(objpfx)tst-map-32bit-mod.so
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LDFLAGS-tst-map-32bit-mod-2.so += -Wl,-z,max-page-size=0x200000
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$(objpfx)tst-map-32bit-mod-2.so: $(libsupport)
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tst-map-32bit-2-ENV = LD_PREFER_MAP_32BIT_EXEC=1
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$(objpfx)tst-map-32bit-2: $(objpfx)tst-map-32bit-mod-2.so
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endif
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