https://bugs.kde.org/show_bug.cgi?id=423929
Bug ID: 423929
Summary: shmat() fails in x86 32-bit mode on valgrind 3.16.0 &
3.16.1
Product: valgrind
Version: unspecified
Platform: Compiled Sources
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: gand...@winds.org
Target Milestone: ---
Created attachment 129936
--> https://bugs.kde.org/attachment.cgi?id=129936&action=edit
Workaround patch
shmat() appears to send the wrong syscall arguments for shmctl() during
ML_(generic_PRE_sys_shmat) in get_shm_size() (file
coregrind/m_syswrap/syswrap-generic.c) when run in x86 32-bit mode. This fails
on both a 32-bit or 64-bit kernel.
The attached patch allows for a workaround for this specific issue (but not
tested in other environments or systems; this is only intended to pinpoint the
problem). The workaround is to remove the VKI_IPC_64 (IPC_64) flag in the
sysctl() syscall. This issue was observed when compiling 32-bit valgrind,
versions 3.16.0 or 3.16.1, on both RedHat Enterprise Linux 4 and Gentoo (latest
version). valgrind 3.15.0 works OK.
Linux - 5.5.2 #2 SMP Fri Feb 7 15:47:00 EST 2020 x86_64 x86_64 x86_64 GNU/Linux
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