mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-02 00:24:12 +08:00
2fd4ef85e0
Pavel Emelianov and Kirill Korotaev observe that fs and arch users of security_vm_enough_memory tend to forget to vm_unacct_memory when a failure occurs further down (typically in setup_arg_pages variants). These are all users of insert_vm_struct, and that reservation will only be unaccounted on exit if the vma is marked VM_ACCOUNT: which in some cases it is (hidden inside VM_STACK_FLAGS) and in some cases it isn't. So x86_64 32-bit and ppc64 vDSO ELFs have been leaking memory into Committed_AS each time they're run. But don't add VM_ACCOUNT to them, it's inappropriate to reserve against the very unlikely case that gdb be used to COW a vDSO page - we ought to do something about that in do_wp_page, but there are yet other inconsistencies to be resolved. The safe and economical way to fix this is to let insert_vm_struct do the security_vm_enough_memory check when it finds VM_ACCOUNT is set. And the MIPS irix_brk has been calling security_vm_enough_memory before calling do_brk which repeats it, doubly accounting and so also leaking. Remove that, and all the fs and arch calls to security_vm_enough_memory: give it a less misleading name later on. Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-Off-By: Kirill Korotaev <dev@sw.ru> Signed-off-by: Linus Torvalds <torvalds@osdl.org> |
||
|---|---|---|
| .. | ||
| arc | ||
| au1000 | ||
| boot | ||
| cobalt | ||
| configs | ||
| ddb5xxx | ||
| dec | ||
| galileo-boards/ev96100 | ||
| gt64120 | ||
| ite-boards | ||
| jazz | ||
| jmr3927 | ||
| kernel | ||
| lasat | ||
| lib | ||
| lib-32 | ||
| lib-64 | ||
| math-emu | ||
| mips-boards | ||
| mm | ||
| momentum | ||
| oprofile | ||
| pci | ||
| pmc-sierra/yosemite | ||
| qemu | ||
| sgi-ip22 | ||
| sgi-ip27 | ||
| sgi-ip32 | ||
| sibyte | ||
| sni | ||
| tx4927 | ||
| vr41xx | ||
| defconfig | ||
| Kconfig | ||
| Kconfig.debug | ||
| Makefile | ||