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| author | Michael Schmitz <schmitzmic@gmail.com> | 2023-01-12 16:55:27 +1300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-10 09:33:51 +0100 |
| commit | ab5fd43a8abc8962709ea8da0aa2205513932e0e (patch) | |
| tree | 6bd6364542b6f27920f991b2194029df3f589c66 | |
| parent | 5f56767fb5f2df875b6553e08dbec6a45431c988 (diff) | |
| download | linux-stable-ab5fd43a8abc8962709ea8da0aa2205513932e0e.tar.gz linux-stable-ab5fd43a8abc8962709ea8da0aa2205513932e0e.tar.bz2 linux-stable-ab5fd43a8abc8962709ea8da0aa2205513932e0e.zip | |
m68k: Check syscall_trace_enter() return code
[ Upstream commit 2ca8a1de4437f21562e57f9ac123914747a8e7a1 ]
Check return code of syscall_trace_enter(), and skip syscall
if -1. Return code will be left at what had been set by
ptrace or seccomp (in regs->d0).
No regression seen in testing with strace on ARAnyM.
Signed-off-by: Michael Schmitz <schmitzmic@gmail.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/20230112035529.13521-2-schmitzmic@gmail.com
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | arch/m68k/68000/entry.S | 2 | ||||
| -rw-r--r-- | arch/m68k/coldfire/entry.S | 2 | ||||
| -rw-r--r-- | arch/m68k/kernel/entry.S | 3 |
3 files changed, 7 insertions, 0 deletions
diff --git a/arch/m68k/68000/entry.S b/arch/m68k/68000/entry.S index 997b54933015..7d63e2f1555a 100644 --- a/arch/m68k/68000/entry.S +++ b/arch/m68k/68000/entry.S @@ -45,6 +45,8 @@ do_trace: jbsr syscall_trace_enter RESTORE_SWITCH_STACK addql #4,%sp + addql #1,%d0 + jeq ret_from_exception movel %sp@(PT_OFF_ORIG_D0),%d1 movel #-ENOSYS,%d0 cmpl #NR_syscalls,%d1 diff --git a/arch/m68k/coldfire/entry.S b/arch/m68k/coldfire/entry.S index 9f337c70243a..35104c5417ff 100644 --- a/arch/m68k/coldfire/entry.S +++ b/arch/m68k/coldfire/entry.S @@ -90,6 +90,8 @@ ENTRY(system_call) jbsr syscall_trace_enter RESTORE_SWITCH_STACK addql #4,%sp + addql #1,%d0 + jeq ret_from_exception movel %d3,%a0 jbsr %a0@ movel %d0,%sp@(PT_OFF_D0) /* save the return value */ diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S index 18f278bdbd21..42879e6eb651 100644 --- a/arch/m68k/kernel/entry.S +++ b/arch/m68k/kernel/entry.S @@ -184,9 +184,12 @@ do_trace_entry: jbsr syscall_trace_enter RESTORE_SWITCH_STACK addql #4,%sp + addql #1,%d0 | optimization for cmpil #-1,%d0 + jeq ret_from_syscall movel %sp@(PT_OFF_ORIG_D0),%d0 cmpl #NR_syscalls,%d0 jcs syscall + jra ret_from_syscall badsys: movel #-ENOSYS,%sp@(PT_OFF_D0) jra ret_from_syscall |