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glibc/sysdeps/x86_64/64/Makefile

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Makefile
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hurd: Implement prefer_map_32bit_exec tunable This makes the prefer_map_32bit_exec tunable no longer Linux-specific. Signed-off-by: Sergey Bugaev <bugaevc@gmail.com> Message-Id: <20230423215526.346009-4-bugaevc@gmail.com>
2023-04-24 05:55:26 +08:00
ifeq ($(subdir),elf)
tests-map-32bit = \
tst-map-32bit-1a \
tst-map-32bit-1b \
ld.so: Always use MAP_COPY to map the first segment [BZ #30452] 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.
2023-06-23 05:30:31 +08:00
tst-map-32bit-2 \
hurd: Implement prefer_map_32bit_exec tunable This makes the prefer_map_32bit_exec tunable no longer Linux-specific. Signed-off-by: Sergey Bugaev <bugaevc@gmail.com> Message-Id: <20230423215526.346009-4-bugaevc@gmail.com>
2023-04-24 05:55:26 +08:00
# tests-map-32bit
tst-map-32bit-1a-no-pie = yes
tst-map-32bit-1b-no-pie = yes
ld.so: Always use MAP_COPY to map the first segment [BZ #30452] 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.
2023-06-23 05:30:31 +08:00
tst-map-32bit-2-no-pie = yes
hurd: Implement prefer_map_32bit_exec tunable This makes the prefer_map_32bit_exec tunable no longer Linux-specific. Signed-off-by: Sergey Bugaev <bugaevc@gmail.com> Message-Id: <20230423215526.346009-4-bugaevc@gmail.com>
2023-04-24 05:55:26 +08:00
tests += $(tests-map-32bit)
modules-map-32bit = \
tst-map-32bit-mod \
ld.so: Always use MAP_COPY to map the first segment [BZ #30452] 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.
2023-06-23 05:30:31 +08:00
tst-map-32bit-mod-2 \
hurd: Implement prefer_map_32bit_exec tunable This makes the prefer_map_32bit_exec tunable no longer Linux-specific. Signed-off-by: Sergey Bugaev <bugaevc@gmail.com> Message-Id: <20230423215526.346009-4-bugaevc@gmail.com>
2023-04-24 05:55:26 +08:00
# modules-map-32bit
modules-names += $(modules-map-32bit)
$(objpfx)tst-map-32bit-mod.so: $(libsupport)
tst-map-32bit-1a-ENV = LD_PREFER_MAP_32BIT_EXEC=1
$(objpfx)tst-map-32bit-1a: $(objpfx)tst-map-32bit-mod.so
tst-map-32bit-1b-ENV = GLIBC_TUNABLES=glibc.cpu.prefer_map_32bit_exec=1
$(objpfx)tst-map-32bit-1b: $(objpfx)tst-map-32bit-mod.so
ld.so: Always use MAP_COPY to map the first segment [BZ #30452] 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.
2023-06-23 05:30:31 +08:00
LDFLAGS-tst-map-32bit-mod-2.so += -Wl,-z,max-page-size=0x200000
$(objpfx)tst-map-32bit-mod-2.so: $(libsupport)
tst-map-32bit-2-ENV = LD_PREFER_MAP_32BIT_EXEC=1
$(objpfx)tst-map-32bit-2: $(objpfx)tst-map-32bit-mod-2.so
hurd: Implement prefer_map_32bit_exec tunable This makes the prefer_map_32bit_exec tunable no longer Linux-specific. Signed-off-by: Sergey Bugaev <bugaevc@gmail.com> Message-Id: <20230423215526.346009-4-bugaevc@gmail.com>
2023-04-24 05:55:26 +08:00
endif
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