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seccomp: rework define for SECCOMP_USER_NOTIF_FLAG_CONTINUE

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Switch from BIT(0) to (1UL << 0).
First, there are already two different forms used in the header, so there's
no need to add a third. Second, the BIT() macros is kernel internal and
afaict not actually exposed to userspace. Maybe there's some magic there
I'm missing but it definitely causes issues when compiling a program that
tries to use SECCOMP_USER_NOTIF_FLAG_CONTINUE. It currently fails in the
following way:

	# github.com/lxc/lxd/lxd
	/usr/bin/ld: $WORK/b001/_x003.o: in function
	`__do_user_notification_continue':
	lxd/main_checkfeature.go:240: undefined reference to `BIT'
	collect2: error: ld returned 1 exit status

Switching to (1UL << 0) should prevent that and is more in line what is
already done in the rest of the header.

Cc: Kees Cook <keescook@chromium.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Link: https://lore.kernel.org/r/20191024212539.4059-1-christian.brauner@ubuntu.com
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Christian Brauner 2019-10-24 23:25:39 +02:00 committed by Kees Cook
parent 2aa8d8d04c
commit 23b2c96fad
1 changed files with 1 additions and 1 deletions
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2
include/uapi/linux/seccomp.h
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@ -103,7 +103,7 @@ struct seccomp_notif {
* SECCOMP_USER_NOTIF_FLAG_CONTINUE. Note that SECCOMP_RET_TRACE can equally
* be overriden by SECCOMP_USER_NOTIF_FLAG_CONTINUE.
*/
#define SECCOMP_USER_NOTIF_FLAG_CONTINUE BIT(0)
#define SECCOMP_USER_NOTIF_FLAG_CONTINUE (1UL << 0)
struct seccomp_notif_resp {
__u64 id;