[PATCH v4 02/31] ARM: ptrace: Split report_syscall()
From: Linus Walleij <hidden>
Date: 2025-02-12 11:23:09
Also in:
lkml
Subsystem:
arm port, ptrace support, the rest · Maintainers:
Russell King, Oleg Nesterov, Linus Torvalds
The generic entry code requires that report_syscall() be provided in two parts: report_syscall_enter() and report_syscall_exit() so split the combined function in two. Signed-off-by: Linus Walleij <redacted> --- arch/arm/kernel/ptrace.c | 30 ++++++++++++++++++++++-------- 1 file changed, 22 insertions(+), 8 deletions(-)
diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index c421a899fc84c476a672cbfe1c8ece8355d8512d..07b0daf47441f1f76a8af416acc74fa5ed770403 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c@@ -827,31 +827,45 @@ enum ptrace_syscall_dir { PTRACE_SYSCALL_EXIT, }; -static void report_syscall(struct pt_regs *regs, enum ptrace_syscall_dir dir) +static void report_syscall_enter(struct pt_regs *regs) { unsigned long ip; /* * IP is used to denote syscall entry/exit: - * IP = 0 -> entry, =1 -> exit + * IP = 0 -> entry */ ip = regs->ARM_ip; - regs->ARM_ip = dir; + regs->ARM_ip = PTRACE_SYSCALL_ENTER; - if (dir == PTRACE_SYSCALL_EXIT) - ptrace_report_syscall_exit(regs, 0); - else if (ptrace_report_syscall_entry(regs)) + if (ptrace_report_syscall_entry(regs)) current_thread_info()->abi_syscall = -1; regs->ARM_ip = ip; } +static void report_syscall_exit(struct pt_regs *regs) +{ + unsigned long ip; + + /* + * IP is used to denote syscall entry/exit: + * IP = 1 -> exit + */ + ip = regs->ARM_ip; + regs->ARM_ip = PTRACE_SYSCALL_EXIT; + + ptrace_report_syscall_exit(regs, 0); + + regs->ARM_ip = ip; +} + asmlinkage int syscall_trace_enter(struct pt_regs *regs) { int scno; if (test_thread_flag(TIF_SYSCALL_TRACE)) - report_syscall(regs, PTRACE_SYSCALL_ENTER); + report_syscall_enter(regs); /* Do seccomp after ptrace; syscall may have changed. */ #ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
@@ -892,5 +906,5 @@ asmlinkage void syscall_trace_exit(struct pt_regs *regs) trace_sys_exit(regs, regs_return_value(regs)); if (test_thread_flag(TIF_SYSCALL_TRACE)) - report_syscall(regs, PTRACE_SYSCALL_EXIT); + report_syscall_exit(regs); }
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2.48.1