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seccomp: Migrate to use SYSCALL_WORK flag

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On architectures using the generic syscall entry code the architecture
independent syscall work is moved to flags in thread_info::syscall_work.
This removes architecture dependencies and frees up TIF bits.

Define SYSCALL_WORK_SECCOMP, use it in the generic entry code and convert
the code which uses the TIF specific helper functions to use the new
*_syscall_work() helpers which either resolve to the new mode for users of
the generic entry code or to the TIF based functions for the other
architectures.

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Link: https://lore.kernel.org/r/20201116174206.2639648-5-krisman@collabora.com
This commit is contained in:
Gabriel Krisman Bertazi 2020-11-16 12:42:00 -05:00 • committed by Thomas Gleixner
parent b86678cf0f
commit 23d67a5485
7 changed files with 15 additions and 13 deletions
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8
include/linux/entry-common.h
View file

@ -21,10 +21,6 @@
# define _TIF_SYSCALL_TRACEPOINT (0)
#endif
#ifndef _TIF_SECCOMP
# define _TIF_SECCOMP (0)
#endif
#ifndef _TIF_SYSCALL_AUDIT
# define _TIF_SYSCALL_AUDIT (0)
#endif
@ -49,7 +45,7 @@
#endif
#define SYSCALL_ENTER_WORK \
(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
_TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_EMU | \
ARCH_SYSCALL_ENTER_WORK)
@ -64,7 +60,7 @@
(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
_TIF_SYSCALL_TRACEPOINT | ARCH_SYSCALL_EXIT_WORK)
#define SYSCALL_WORK_ENTER (0)
#define SYSCALL_WORK_ENTER (SYSCALL_WORK_SECCOMP)
#define SYSCALL_WORK_EXIT (0)
/*

2
include/linux/seccomp.h
View file

@ -42,7 +42,7 @@ struct seccomp {
extern int __secure_computing(const struct seccomp_data *sd);
static inline int secure_computing(void)
{
if (unlikely(test_thread_flag(TIF_SECCOMP)))
if (unlikely(test_syscall_work(SECCOMP)))
return __secure_computing(NULL);
return 0;
}

6
include/linux/thread_info.h
View file

@ -35,6 +35,12 @@ enum {
GOOD_STACK,
};
enum syscall_work_bit {
SYSCALL_WORK_BIT_SECCOMP,
};
#define SYSCALL_WORK_SECCOMP BIT(SYSCALL_WORK_BIT_SECCOMP)
#include <asm/thread_info.h>
#ifdef __KERNEL__