https://bugs.kde.org/show_bug.cgi?id=405201
Bug ID: 405201
Summary: Incorrect size of struct vki_siginfo on 64-bit Linux
architectures
Product: valgrind
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: memcheck
Assignee: jsew...@acm.org
Reporter: l...@altlinux.org
Target Milestone: ---
strace's "make check-valgind-memcheck" produces false reports about
out-of-bounds writes on ptrace(PTRACE_GETSIGINFO) invocations on x86_64.
This turned out to be a bug in the definition of struct vki_siginfo: its size
is 136 which exceeds VKI_SI_MAX_SIZE==128 by 8 bytes.
As all 64-bit architectures have union _sifields aligned to wordsize
boundary, there is a hole between the preamble and _sifields.
Unfortunately, __VKI_ARCH_SI_PREAMBLE_SIZE doesn't take this into account,
this results to off-by-one bug in VKI_SI_PAD_SIZE and the whole structure being
8 bytes larger on 64-bit architectures.
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