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| author | Al Viro <viro@zeniv.linux.org.uk> | 2021-07-25 17:19:45 +0000 |
|---|---|---|
| committer | Geert Uytterhoeven <geert@linux-m68k.org> | 2021-09-24 13:35:01 +0200 |
| commit | 50e43a57334400668952f8e551c9d87d3ed2dfef (patch) | |
| tree | ddfbe66c2a1d472a4a86aa982409b2eb1c52751e /arch | |
| parent | 4bb0bd81ce5e97092dfda6a106d414b703ec0ee8 (diff) | |
| download | linux-50e43a57334400668952f8e551c9d87d3ed2dfef.tar.bz2 | |
m68k: Update ->thread.esp0 before calling syscall_trace() in ret_from_signal
We get there when sigreturn has performed obscene acts on kernel stack;
in particular, the location of pt_regs has shifted. We are about to call
syscall_trace(), which might stop for tracer. If that happens, we'd better
have task_pt_regs() returning correct result...
Fucked-up-by: Al Viro <viro@zeniv.linux.org.uk>
Fixes: bd6f56a75bb2 ("m68k: Missing syscall_trace() on sigreturn")
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Reviewed-by: Michael Schmitz <schmitzmic@gmail.com>
Tested-by: Finn Thain <fthain@linux-m68k.org>
Link: https://lore.kernel.org/r/YP2dMWeV1LkHiOpr@zeniv-ca.linux.org.uk
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/m68k/kernel/entry.S | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S index 9dd76fbb7c6b..ff9e842cec0f 100644 --- a/arch/m68k/kernel/entry.S +++ b/arch/m68k/kernel/entry.S @@ -186,6 +186,8 @@ ENTRY(ret_from_signal) movel %curptr@(TASK_STACK),%a1 tstb %a1@(TINFO_FLAGS+2) jge 1f + lea %sp@(SWITCH_STACK_SIZE),%a1 + movel %a1,%curptr@(TASK_THREAD+THREAD_ESP0) jbsr syscall_trace 1: RESTORE_SWITCH_STACK addql #4,%sp |