From: Francis Laniel <flaniel@linux.microsoft.com>
To: linux-arm-kernel@lists.infradead.org
Cc: linux-trace-devel@vger.kernel.org,
Francis Laniel <flaniel@linux.microsoft.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Mark Brown <broonie@kernel.org>,
Peter Collingbourne <pcc@google.com>,
Mark Rutland <mark.rutland@arm.com>,
Kees Cook <keescook@chromium.org>,
Daniel Kiss <daniel.kiss@arm.com>,
linux-kernel@vger.kernel.org
Subject: [RFC PATCH v1 1/1] arm64: Forget syscall if different from execve*()
Date: Mon, 9 May 2022 16:19:57 +0100 [thread overview]
Message-ID: <20220509151958.441240-2-flaniel@linux.microsoft.com> (raw)
In-Reply-To: <20220509151958.441240-1-flaniel@linux.microsoft.com>
This patch enables exeve*() to be traced by syscalls:sys_exit_execve
tracepoint.
Previously, calling forget_syscall() would set syscall to -1, which impedes
this tracepoint to prints its information.
So, this patch makes call to forget_syscall() conditional by only calling
it when syscall number is not execve() or execveat().
Signed-off-by: Francis Laniel <flaniel@linux.microsoft.com>
---
arch/arm64/include/asm/processor.h | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h
index 73e38d9a540c..e12ceb363d6a 100644
--- a/arch/arm64/include/asm/processor.h
+++ b/arch/arm64/include/asm/processor.h
@@ -34,6 +34,8 @@
#include <vdso/processor.h>
+#include <asm-generic/unistd.h>
+
#include <asm/alternative.h>
#include <asm/cpufeature.h>
#include <asm/hw_breakpoint.h>
@@ -250,8 +252,12 @@ void tls_preserve_current_state(void);
static inline void start_thread_common(struct pt_regs *regs, unsigned long pc)
{
+ s32 previous_syscall = regs->syscallno;
memset(regs, 0, sizeof(*regs));
- forget_syscall(regs);
+ if (previous_syscall == __NR_execve || previous_syscall == __NR_execveat)
+ regs->syscallno = previous_syscall;
+ else
+ forget_syscall(regs);
regs->pc = pc;
if (system_uses_irq_prio_masking())
--
2.25.1
next prev parent reply other threads:[~2022-05-09 15:20 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-09 15:19 [RFC PATCH v1 0/1] Call forget_syscall() if different than execve*() Francis Laniel
2022-05-09 15:19 ` Francis Laniel [this message]
2022-05-10 10:59 ` [RFC PATCH v1 1/1] arm64: Forget syscall if different from execve*() Will Deacon
2022-05-10 14:00 ` Francis Laniel
2022-05-10 14:03 ` Will Deacon
2022-05-10 14:12 ` Francis Laniel
2022-05-18 13:32 ` Catalin Marinas
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