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| author | Oleg Nesterov | 2012-09-14 18:23:51 +0200 |
|---|---|---|
| committer | Oleg Nesterov | 2012-09-29 21:21:52 +0200 |
| commit | 746a9e6ba24af2ccf03279c99d435a1b88ca5d17 (patch) | |
| tree | 7ee4399b90c952520c492fea64cb2d841341d0d4 /kernel | |
| parent | uprobes: Do not leak UTASK_BP_HIT if find_active_uprobe() fails (diff) | |
| download | kernel-qcow2-linux-746a9e6ba24af2ccf03279c99d435a1b88ca5d17.tar.gz kernel-qcow2-linux-746a9e6ba24af2ccf03279c99d435a1b88ca5d17.tar.xz kernel-qcow2-linux-746a9e6ba24af2ccf03279c99d435a1b88ca5d17.zip | |
uprobes: Do not setup ->active_uprobe/state prematurely
handle_swbp() sets utask->active_uprobe before handler_chain(),
and UTASK_SSTEP before pre_ssout(). This complicates the code
for no reason, arch_ hooks or consumer->handler() should not
(and can't) use this info.
Change handle_swbp() to initialize them after pre_ssout(), and
remove the no longer needed cleanup-utask code.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
cked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/events/uprobes.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 2c1ff05af6f5..41f048c91425 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -1496,22 +1496,19 @@ static void handle_swbp(struct pt_regs *regs) if (!utask) goto cleanup_ret; } - utask->active_uprobe = uprobe; + handler_chain(uprobe, regs); if (uprobe->flags & UPROBE_SKIP_SSTEP && can_skip_sstep(uprobe, regs)) goto cleanup_ret; - utask->state = UTASK_SSTEP; if (!pre_ssout(uprobe, regs, bp_vaddr)) { arch_uprobe_enable_step(&uprobe->arch); + utask->active_uprobe = uprobe; + utask->state = UTASK_SSTEP; return; } cleanup_ret: - if (utask) { - utask->active_uprobe = NULL; - utask->state = UTASK_RUNNING; - } if (!(uprobe->flags & UPROBE_SKIP_SSTEP)) /* |