[PATCH v3 2/3] powerpc: Relax secure computing on syscall entry trace
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STALE4256d
SUPERSEDED
From: Bogdan Purcareata <hidden>
Date: 2015-02-13 08:22:54
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), ptrace support, the rest · Maintainers:
Madhavan Srinivasan, Oleg Nesterov, Linus Torvalds
Revision v3 of 4 in this series.
Revisions (4)
- v1 [diff vs current]
- v2 [diff vs current]
- v3 current
- v4 [diff vs current]
The secure_computing_strict will just force the kernel to panic on secure_computing failure. Once SECCOMP_FILTER support is enabled in the kernel, syscalls can be denied without system failure. Signed-off-by: Bogdan Purcareata <redacted> --- arch/powerpc/kernel/ptrace.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index 2edae06..285e056 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c@@ -1772,7 +1772,9 @@ long do_syscall_trace_enter(struct pt_regs *regs) user_exit(); - secure_computing_strict(regs->gpr[0]); + /* Do the secure computing check first; failures should be fast. */ + if (secure_computing(regs->gpr[0]) == -1) + return -1L; if (test_thread_flag(TIF_SYSCALL_TRACE) && tracehook_report_syscall_entry(regs)) {
--
2.1.4