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authorMarkus Metzger <markus.t.metzger@intel.com>2009-02-11 15:10:27 +0100
committerIngo Molnar <mingo@elte.hu>2009-02-11 15:44:20 +0100
commit9f339e7028e2855717af3193c938f9960ad13b38 (patch)
tree76e0e9181f4ee2b324742d517518e837d5c250bf /include/linux
parent06eb23b1ba39c61ee5d5faeb42a097635693e370 (diff)
x86, ptrace, mm: fix double-free on race
Ptrace_detach() races with __ptrace_unlink() if the traced task is reaped while detaching. This might cause a double-free of the BTS buffer. Change the ptrace_detach() path to only do the memory accounting in ptrace_bts_detach() and leave the buffer free to ptrace_bts_untrace() which will be called from __ptrace_unlink(). The fix follows a proposal from Oleg Nesterov. Reported-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/mm.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index e8ddc98b840..3d7fb44d7d7 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1305,5 +1305,6 @@ void vmemmap_populate_print_last(void);
extern void *alloc_locked_buffer(size_t size);
extern void free_locked_buffer(void *buffer, size_t size);
+extern void release_locked_buffer(void *buffer, size_t size);
#endif /* __KERNEL__ */
#endif /* _LINUX_MM_H */