path: root/arch/x86/kernel/process_64.c
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authorH. Peter Anvin <hpa@zytor.com>2012-03-14 14:27:52 -0700
committerH. Peter Anvin <hpa@zytor.com>2012-03-14 14:27:52 -0700
commit31796ac4e8f0e88f5c10f1ad6dab8f19bebe44a4 (patch)
treec9ae9d50b327d9f5e56f689b8dea5fe6f9a2bfc1 /arch/x86/kernel/process_64.c
parentbb6fa8b275e132b1e9319dbab94211543a0b7bd3 (diff)
x32: Fix alignment fail in struct compat_siginfo
Adding struct _sigchld_x32 caused a misalignment cascade in struct siginfo, because union _sifields is located on an 4-byte boundary (8-byte misaligned.) Adding new fields that are 8-byte aligned caused the intermediate structures to also be aligned to 8 bytes, thereby adding padding in unexpected places. Thus, change s64 to compat_s64 here, which makes it "misaligned on paper". In reality these fields *are* actually aligned (there are 3 preceeding ints outside the union and 3 inside struct _sigchld_x32), but because of the intervening union and struct it is not possible for gcc to avoid padding without breaking the ABI. Reported-and-tested-by: H. J. Lu <hjl.tools@gmail.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com> Link: http://lkml.kernel.org/r/1329696488-16970-1-git-send-email-hpa@zytor.com
Diffstat (limited to 'arch/x86/kernel/process_64.c')
0 files changed, 0 insertions, 0 deletions

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