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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-07-28 05:54:32 +0400 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-08-20 04:12:34 +0400 |
| commit | dd90bbd5fb763ab8924135a30956030c7a7b94fc (patch) | |
| tree | e8cb73517611d26b74086025958e88404994f028 /arch/powerpc/kernel/sys_ppc32.c | |
| parent | c79b29735d28d819380b584d6707b4110ee759f3 (diff) | |
| download | linux-dd90bbd5fb763ab8924135a30956030c7a7b94fc.tar.xz | |
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:
http://bzr.linuxfoundation.org/lsb/devel/runtime-test?cmd=inventory;rev=stewb%40linux-foundation.org-20090626205411-sfb23cc0tjj7jzgm;path=modules/vsx-pcts/tset/POSIX.os/files/truncate/
BenH: Added compat_sys_ftruncate() as well, same issue.
Signed-off-by: Chase Douglas <cndougla@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/sys_ppc32.c')
| -rw-r--r-- | arch/powerpc/kernel/sys_ppc32.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/sys_ppc32.c b/arch/powerpc/kernel/sys_ppc32.c index bb1cfcfdbbbb..1cc5e9e5da96 100644 --- a/arch/powerpc/kernel/sys_ppc32.c +++ b/arch/powerpc/kernel/sys_ppc32.c @@ -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) |