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authorWill Deacon <will.deacon@arm.com>2014-02-04 14:41:26 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-02-20 11:06:11 -0800
commit6737eaebff6297e5b6aeb458a4b4ad4b61df8f57 (patch)
tree4de8c1e5e99b248def4e935980230079c45551b6 /arch
parentb666f382900c74f23c78556777041c2ceb7c2b24 (diff)
downloadlinaro-lsk-6737eaebff6297e5b6aeb458a4b4ad4b61df8f57.tar.gz
arm64: vdso: prevent ld from aligning PT_LOAD segments to 64k
commit 40507403485fcb56b83d6ddfc954e9b08305054c upstream. Whilst the text segment for our VDSO is marked as PT_LOAD in the ELF headers, it is mapped by the kernel and not actually subject to demand-paging. ld doesn't realise this, and emits a p_align field of 64k (the maximum supported page size), which conflicts with the load address picked by the kernel on 4k systems, which will be 4k aligned. This causes GDB to fail with "Failed to read a valid object file image from memory" when attempting to load the VDSO. This patch passes the -n option to ld, which prevents it from aligning PT_LOAD segments to the maximum page size. Reported-by: Kyle McMartin <kyle@redhat.com> Acked-by: Kyle McMartin <kyle@redhat.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm64/kernel/vdso/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile
index d8064af42e6..6d20b7d162d 100644
--- a/arch/arm64/kernel/vdso/Makefile
+++ b/arch/arm64/kernel/vdso/Makefile
@@ -48,7 +48,7 @@ $(obj-vdso): %.o: %.S
# Actual build commands
quiet_cmd_vdsold = VDSOL $@
- cmd_vdsold = $(CC) $(c_flags) -Wl,-T $^ -o $@
+ cmd_vdsold = $(CC) $(c_flags) -Wl,-n -Wl,-T $^ -o $@
quiet_cmd_vdsoas = VDSOA $@
cmd_vdsoas = $(CC) $(a_flags) -c -o $@ $<