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| author | H. Peter Anvin <hpa@zytor.com> | 2012-03-15 01:27:52 +0400 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2012-03-15 01:27:52 +0400 |
| commit | 31796ac4e8f0e88f5c10f1ad6dab8f19bebe44a4 (patch) | |
| tree | c9ae9d50b327d9f5e56f689b8dea5fe6f9a2bfc1 | |
| parent | bb6fa8b275e132b1e9319dbab94211543a0b7bd3 (diff) | |
| download | linux-31796ac4e8f0e88f5c10f1ad6dab8f19bebe44a4.tar.xz | |
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
| -rw-r--r-- | arch/x86/include/asm/ia32.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/include/asm/ia32.h b/arch/x86/include/asm/ia32.h index 7d0c18587709..ee52760549f0 100644 --- a/arch/x86/include/asm/ia32.h +++ b/arch/x86/include/asm/ia32.h @@ -130,8 +130,8 @@ typedef struct compat_siginfo { unsigned int _pid; /* which child */ unsigned int _uid; /* sender's uid */ int _status; /* exit code */ - s64 _utime; - s64 _stime; + compat_s64 _utime; + compat_s64 _stime; } _sigchld_x32; /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ |