linux-kernel - [GIT pull] core/urgent for v5.9-rc2

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Message-ID: <159817113401.5783.14776307451257171431.tglx@nanos>
Date:   Sun, 23 Aug 2020 08:25:34 -0000
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org
Subject: [GIT pull] core/urgent for v5.9-rc2

Linus,

please pull the latest core/urgent branch from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core-urgent-2020-08-23

up to:  d88d59b64ca3: core/entry: Respect syscall number rewrites


A single bug fix for the common entry code. The transcript of the x86
version messed up the reload of the syscall number from pt_regs after
ptrace and seccomp which breaks syscall number rewriting.

Thanks,

	tglx

------------------>
Thomas Gleixner (1):
      core/entry: Respect syscall number rewrites


 kernel/entry/common.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/entry/common.c b/kernel/entry/common.c
index 9852e0d62d95..fcae019158ca 100644
--- a/kernel/entry/common.c
+++ b/kernel/entry/common.c
@@ -65,7 +65,8 @@ static long syscall_trace_enter(struct pt_regs *regs, long syscall,
 
 	syscall_enter_audit(regs, syscall);
 
-	return ret ? : syscall;
+	/* The above might have changed the syscall number */
+	return ret ? : syscall_get_nr(current, regs);
 }
 
 noinstr long syscall_enter_from_user_mode(struct pt_regs *regs, long syscall)