UBSAN: shift-out-of-bounds in fs/locks.c:2572:16
left shift of 1 by 63 places cannot be represented in type 'long long int'
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x8d/0xcf lib/dump_stack.c:106
ubsan_epilogue+0xa/0x44 lib/ubsan.c:151
__ubsan_handle_shift_out_of_bounds+0x1e7/0x208 lib/ubsan.c:322
locks_remove_posix+0xba/0x290 fs/locks.c:2572
filp_close+0x61/0xa0 fs/open.c:1424
close_fd+0x56/0x70 fs/file.c:664
__do_sys_close fs/open.c:1439 [inline]
__se_sys_close fs/open.c:1437 [inline]
__x64_sys_close+0x1a/0x50 fs/open.c:1437
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x34/0x80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
</TASK>
INT_LIMIT() tries to do what type_max() does, except that type_max()
doesn't rely upon undefined behaviour, might as well use type_max()
instead.
Suggested-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Signed-off-by: Zhen Lei <thunder.leizhen@xxxxxxxxxx>
Reviewed-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
include/linux/fs.h | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index e654435f16512c1..a384741b1449457 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1131,9 +1131,8 @@ struct file_lock_context {
/* The following constant reflects the upper bound of the file/locking space */
#ifndef OFFSET_MAX
-#define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
-#define OFFSET_MAX INT_LIMIT(loff_t)
-#define OFFT_OFFSET_MAX INT_LIMIT(off_t)
+#define OFFSET_MAX type_max(loff_t)
+#define OFFT_OFFSET_MAX type_max(off_t)
#endif
extern void send_sigio(struct fown_struct *fown, int fd, int band);
--
2.25.1
