Commit dd90bbd5 authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt
Browse files

powerpc: Add compat_sys_truncate

The truncate syscall has a signed long parameter, so when using a 32-
bit userspace with a 64-bit kernel the argument is zero-extended
instead of sign-extended. Adding the compat_sys_truncate function
fixes the issue.

This was noticed during an LSB truncate test failure. The test was
checking for the correct error number set when truncate is called with
a length of -1. The test can be found at:;;path=modules/vsx-pcts/tset/POSIX.os/files/truncate/

BenH: Added compat_sys_ftruncate() as well, same issue.
Signed-off-by: default avatarChase Douglas <>
Signed-off-by: default avatarBenjamin Herrenschmidt <>
parent c79b2973
......@@ -95,8 +95,8 @@ SYSCALL(reboot)
......@@ -343,6 +343,18 @@ off_t ppc32_lseek(unsigned int fd, u32 offset, unsigned int origin)
return sys_lseek(fd, (int)offset, origin);
long compat_sys_truncate(const char __user * path, u32 length)
/* sign extend length */
return sys_truncate(path, (int)length);
long compat_sys_ftruncate(int fd, u32 length)
/* sign extend length */
return sys_ftruncate(fd, (int)length);
/* Note: it is necessary to treat bufsiz as an unsigned int,
* with the corresponding cast to a signed int to insure that the
* proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
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