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entry: Make return type of syscall_trace_enter() bool

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This prepares for changing the return types of
syscall_enter_from_user_mode[_work]() to bool, which in turn separates the
decision of invoking the syscall from the syscall number, which might have
been changed in the call by ptrace, seccomp, tracing.

Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Tested-by: Michal Suchánek <msuchanek@suse.de>
Reviewed-by: Jinjie Ruan <ruanjinjie@huawei.com>
Link: https://patch.msgid.link/20260712141346.699072205@kernel.org
This commit is contained in:
Thomas Gleixner
2026-07-20 20:38:40 +02:00
parent dfc98c7a46
commit 71ff30013f
1 changed files with 11 additions and 7 deletions
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include/linux/entry-common.h
+11 -7
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@@ -72,7 +72,7 @@ static __always_inline long syscall_trace_enter(struct pt_regs *regs, unsigned l
*/
if (work & SYSCALL_WORK_SYSCALL_USER_DISPATCH) {
if (syscall_user_dispatch(regs))
return -1L;
return false;
}
/*
@@ -87,7 +87,7 @@ static __always_inline long syscall_trace_enter(struct pt_regs *regs, unsigned l
if (work & (SYSCALL_WORK_SYSCALL_TRACE | SYSCALL_WORK_SYSCALL_EMU)) {
if (!arch_ptrace_report_syscall_permit_entry(regs) ||
(work & SYSCALL_WORK_SYSCALL_EMU))
return -1L;
return false;
/* ptrace might have changed work flags */
work = READ_ONCE(current_thread_info()->syscall_work);
@@ -96,7 +96,7 @@ static __always_inline long syscall_trace_enter(struct pt_regs *regs, unsigned l
/* Do seccomp after ptrace, to catch any tracer changes. */
if (work & SYSCALL_WORK_SECCOMP) {
if (!__seccomp_permit_syscall())
return -1L;
return false;
}
if (unlikely(work & SYSCALL_WORK_SYSCALL_TRACEPOINT))
@@ -105,8 +105,7 @@ static __always_inline long syscall_trace_enter(struct pt_regs *regs, unsigned l
if (unlikely(audit_context()))
syscall_enter_audit(regs);
/* Either of the above might have changed the syscall number */
return syscall_get_nr(current, regs);
return true;
}
/**
@@ -136,8 +135,13 @@ static __always_inline long syscall_enter_from_user_mode_work(struct pt_regs *re
{
unsigned long work = READ_ONCE(current_thread_info()->syscall_work);
if (work & SYSCALL_WORK_ENTER)
syscall = syscall_trace_enter(regs, work, syscall);
if (work & SYSCALL_WORK_ENTER) {
if (!syscall_trace_enter(regs, work, syscall))
return -1L;
/* Reread the syscall number as it might have been modified */
syscall = syscall_get_nr(current, regs);
}
return syscall;
}