From: Will Deacon Date: Tue, 4 Feb 2014 14:41:26 +0000 (+0000) Subject: arm64: vdso: prevent ld from aligning PT_LOAD segments to 64k X-Git-Tag: v3.10.33~182 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6737eaebff6297e5b6aeb458a4b4ad4b61df8f57;p=platform%2Fkernel%2Flinux-3.10.git 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 Acked-by: Kyle McMartin Signed-off-by: Will Deacon Signed-off-by: Catalin Marinas Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile index d8064af..6d20b7d 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 $@ $<