[PATCH 02/10] signal/arm64: Better isolate the COMPAT_TASK portion of ptrace_hbptriggered
From: Eric W. Biederman <hidden>
Date: 2018-01-23 21:11:03
Also in:
lkml
Subsystem:
arm64 port (aarch64 architecture), ptrace support, the rest · Maintainers:
Catalin Marinas, Will Deacon, Oleg Nesterov, Linus Torvalds
Instead of jumpping while !is_compat_task placee all of the code inside of an if (is_compat_task) block. This allows the int i variable to be properly limited to the compat block no matter how the rest of ptrace_hbptriggered changes. In a following change a non-variable declaration will preceed was made independent to ensure the code is easy to review. Signed-off-by: "Eric W. Biederman" <redacted> --- arch/arm64/kernel/ptrace.c | 27 ++++++++++++--------------- 1 file changed, 12 insertions(+), 15 deletions(-)
diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index 7c44658b316d..0a1cf830e4b3 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c@@ -188,26 +188,23 @@ static void ptrace_hbptriggered(struct perf_event *bp, }; #ifdef CONFIG_COMPAT - int i; - - if (!is_compat_task()) - goto send_sig; + if (is_compat_task()) { + int i; - for (i = 0; i < ARM_MAX_BRP; ++i) { - if (current->thread.debug.hbp_break[i] == bp) { - info.si_errno = (i << 1) + 1; - break; + for (i = 0; i < ARM_MAX_BRP; ++i) { + if (current->thread.debug.hbp_break[i] == bp) { + info.si_errno = (i << 1) + 1; + break; + } } - } - for (i = 0; i < ARM_MAX_WRP; ++i) { - if (current->thread.debug.hbp_watch[i] == bp) { - info.si_errno = -((i << 1) + 1); - break; + for (i = 0; i < ARM_MAX_WRP; ++i) { + if (current->thread.debug.hbp_watch[i] == bp) { + info.si_errno = -((i << 1) + 1); + break; + } } } - -send_sig: #endif force_sig_info(SIGTRAP, &info, current); }
--
2.14.1