Messages in this thread Patch in this message | | | From | Ben Dooks <> | Subject | [PATCH] capabilities: fix sparse warning about __user access | Date | Mon, 19 Jun 2023 13:35:35 +0100 |
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The two syscalls for capget and capset are producing sparse warnings as sparse is thinking that the "struct __user_cap_data_struct" is marked user, which seems to be down to the declaration and typedef at the same time.
Fix the following warnings by splutting the struct declaration and then the user typedef into two:
kernel/capability.c:191:35: warning: incorrect type in argument 2 (different address spaces) kernel/capability.c:191:35: expected void const *from kernel/capability.c:191:35: got struct __user_cap_data_struct [noderef] __user * kernel/capability.c:168:14: warning: dereference of noderef expression kernel/capability.c:168:45: warning: dereference of noderef expression kernel/capability.c:169:14: warning: dereference of noderef expression kernel/capability.c:169:45: warning: dereference of noderef expression kernel/capability.c:170:14: warning: dereference of noderef expression kernel/capability.c:170:45: warning: dereference of noderef expression kernel/capability.c:244:29: warning: incorrect type in argument 1 (different address spaces) kernel/capability.c:244:29: expected void *to kernel/capability.c:244:29: got struct __user_cap_data_struct [noderef] __user ( * )[2] kernel/capability.c:247:42: warning: dereference of noderef expression kernel/capability.c:247:64: warning: dereference of noderef expression kernel/capability.c:248:42: warning: dereference of noderef expression kernel/capability.c:248:64: warning: dereference of noderef expression kernel/capability.c:249:42: warning: dereference of noderef expression kernel/capability.c:249:64: warning: dereference of noderef expression
Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk> --- include/uapi/linux/capability.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/include/uapi/linux/capability.h b/include/uapi/linux/capability.h index 3d61a0ae055d..5bb906098697 100644 --- a/include/uapi/linux/capability.h +++ b/include/uapi/linux/capability.h @@ -41,11 +41,12 @@ typedef struct __user_cap_header_struct { int pid; } __user *cap_user_header_t; -typedef struct __user_cap_data_struct { +struct __user_cap_data_struct { __u32 effective; __u32 permitted; __u32 inheritable; -} __user *cap_user_data_t; +}; +typedef struct __user_cap_data_struct __user *cap_user_data_t; #define VFS_CAP_REVISION_MASK 0xFF000000 -- 2.39.2
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