diff options
author | Song Liu <song@kernel.org> | 2023-09-06 10:52:15 -0700 |
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committer | Ingo Molnar <mingo@kernel.org> | 2023-09-06 23:49:12 +0200 |
commit | 65e710899fd19f435f40268f3a92dfaa11f14470 (patch) | |
tree | 162b657c93198c07c64b448ba4f95e2cb133c737 /scripts | |
parent | 3f874c9b2aae8e30463efc1872bea4baa9ed25dc (diff) |
x86/build: Fix linker fill bytes quirk/incompatibility for ld.lld
With ":text =0xcccc", ld.lld fills unused text area with 0xcccc0000.
Example objdump -D output:
ffffffff82b04203: 00 00 add %al,(%rax)
ffffffff82b04205: cc int3
ffffffff82b04206: cc int3
ffffffff82b04207: 00 00 add %al,(%rax)
ffffffff82b04209: cc int3
ffffffff82b0420a: cc int3
Replace it with ":text =0xcccccccc", so we get the following instead:
ffffffff82b04203: cc int3
ffffffff82b04204: cc int3
ffffffff82b04205: cc int3
ffffffff82b04206: cc int3
ffffffff82b04207: cc int3
ffffffff82b04208: cc int3
gcc/ld doesn't seem to have the same issue. The generated code stays the
same for gcc/ld.
Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Fixes: 7705dc855797 ("x86/vmlinux: Use INT3 instead of NOP for linker fill bytes")
Link: https://lore.kernel.org/r/20230906175215.2236033-1-song@kernel.org
Diffstat (limited to 'scripts')
0 files changed, 0 insertions, 0 deletions