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| /openbmc/linux/arch/s390/include/asm/ |
| H A D | compat.h | 9a205286 Wed Mar 05 05:55:06 CST 2014 Heiko Carstens <heiko.carstens@de.ibm.com> s390/compat: build error for large compat syscall args
Enforce 32 bit types for all compat syscall argument types.
This way we can make sure that all arguments get correct sign
or zero extension. Otherwise incorrect code would be generated.
E.g. for a 'long' type the COMPAT_SYSCALL_DEFINE macro wouldn't
generate code that would cause sign extension of the passed in 32
bit user space parameter.
This can cause quite subtle bugs like e.g. the one that was fixed
with dfd948e32af2e "fs/compat: fix parameter handling for compat
readv/writev syscalls".
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
9a205286 Wed Mar 05 05:55:06 CST 2014 Heiko Carstens <heiko.carstens@de.ibm.com> s390/compat: build error for large compat syscall args
Enforce 32 bit types for all compat syscall argument types.
This way we can make sure that all arguments get correct sign
or zero extension. Otherwise incorrect code would be generated.
E.g. for a 'long' type the COMPAT_SYSCALL_DEFINE macro wouldn't
generate code that would cause sign extension of the passed in 32
bit user space parameter.
This can cause quite subtle bugs like e.g. the one that was fixed
with dfd948e32af2e "fs/compat: fix parameter handling for compat
readv/writev syscalls".
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
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