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| author | Gaosheng Cui <cuigaosheng1@huawei.com> | 2022-10-31 14:25:36 +0300 |
|---|---|---|
| committer | Paul Moore <paul@paul-moore.com> | 2022-11-05 08:25:57 +0300 |
| commit | 46653972e3ea64f79e7f8ae3aa41a4d3fdb70a13 (patch) | |
| tree | a2f8c8a8eb3551df5f87d8d6d17c2adbc419256c /include/uapi | |
| parent | 8cf0a1bc12870d148ae830a4ba88cfdf0e879cee (diff) | |
| download | linux-46653972e3ea64f79e7f8ae3aa41a4d3fdb70a13.tar.xz | |
capabilities: fix undefined behavior in bit shift for CAP_TO_MASK
Shifting signed 32-bit value by 31 bits is undefined, so changing
significant bit to unsigned. The UBSAN warning calltrace like below:
UBSAN: shift-out-of-bounds in security/commoncap.c:1252:2
left shift of 1 by 31 places cannot be represented in type 'int'
Call Trace:
<TASK>
dump_stack_lvl+0x7d/0xa5
dump_stack+0x15/0x1b
ubsan_epilogue+0xe/0x4e
__ubsan_handle_shift_out_of_bounds+0x1e7/0x20c
cap_task_prctl+0x561/0x6f0
security_task_prctl+0x5a/0xb0
__x64_sys_prctl+0x61/0x8f0
do_syscall_64+0x58/0x80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
</TASK>
Fixes: e338d263a76a ("Add 64-bit capability support to the kernel")
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Acked-by: Andrew G. Morgan <morgan@kernel.org>
Reviewed-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/linux/capability.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/uapi/linux/capability.h b/include/uapi/linux/capability.h index 463d1ba2232a..3d61a0ae055d 100644 --- a/include/uapi/linux/capability.h +++ b/include/uapi/linux/capability.h @@ -426,7 +426,7 @@ struct vfs_ns_cap_data { */ #define CAP_TO_INDEX(x) ((x) >> 5) /* 1 << 5 == bits in __u32 */ -#define CAP_TO_MASK(x) (1 << ((x) & 31)) /* mask for indexed __u32 */ +#define CAP_TO_MASK(x) (1U << ((x) & 31)) /* mask for indexed __u32 */ #endif /* _UAPI_LINUX_CAPABILITY_H */ |