diff options
| author | Linus Torvalds <torvalds@osdl.org> | 2006-04-18 20:59:27 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-04-24 09:56:04 -0700 |
| commit | 3e5a2e956fff9e975e1b76c4de314cd077c6ec87 (patch) | |
| tree | a6c44e27135735148fd0f332cf807f87ab71713e /fs/open.c | |
| parent | 248c64d252a614b7d07ed85e1d714b25dd537d57 (diff) | |
[PATCH] x86: be careful about tailcall breakage for sys_open[at] too
x86: be careful about tailcall breakage for sys_open[at] too
Came up through a quick grep for other cases similar to the ftruncate()
one in commit 0a489cb3b6a7b277030cdbc97c2c65905db94536.
Also, add a comment, so that people who read the code understand why we
do what looks like a no-op.
(Again, this won't actually matter to any sane user, since libc will
save and restore the register gcc stomps on, but it's still wrong to
stomp on it)
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/open.c')
| -rw-r--r-- | fs/open.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/fs/open.c b/fs/open.c index b73623cdb57..f697914649e 100644 --- a/fs/open.c +++ b/fs/open.c @@ -331,6 +331,7 @@ out: asmlinkage long sys_ftruncate(unsigned int fd, unsigned long length) { long ret = do_sys_ftruncate(fd, length, 1); + /* avoid REGPARM breakage on x86: */ prevent_tail_call(ret); return ret; } @@ -345,6 +346,7 @@ asmlinkage long sys_truncate64(const char __user * path, loff_t length) asmlinkage long sys_ftruncate64(unsigned int fd, loff_t length) { long ret = do_sys_ftruncate(fd, length, 0); + /* avoid REGPARM breakage on x86: */ prevent_tail_call(ret); return ret; } @@ -1087,20 +1089,30 @@ long do_sys_open(int dfd, const char __user *filename, int flags, int mode) asmlinkage long sys_open(const char __user *filename, int flags, int mode) { + long ret; + if (force_o_largefile()) flags |= O_LARGEFILE; - return do_sys_open(AT_FDCWD, filename, flags, mode); + ret = do_sys_open(AT_FDCWD, filename, flags, mode); + /* avoid REGPARM breakage on x86: */ + prevent_tail_call(ret); + return ret; } EXPORT_SYMBOL_GPL(sys_open); asmlinkage long sys_openat(int dfd, const char __user *filename, int flags, int mode) { + long ret; + if (force_o_largefile()) flags |= O_LARGEFILE; - return do_sys_open(dfd, filename, flags, mode); + ret = do_sys_open(dfd, filename, flags, mode); + /* avoid REGPARM breakage on x86: */ + prevent_tail_call(ret); + return ret; } EXPORT_SYMBOL_GPL(sys_openat); |