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由 James Hogan 提交于
MIPS' struct compat_flock doesn't match the 32-bit struct flock, as it has an extra short __unused before pad[4], which combined with alignment increases the size to 40 bytes compared with struct flock's 36 bytes. Since commit 8c6657cb ("Switch flock copyin/copyout primitives to copy_{from,to}_user()"), put_compat_flock() writes the full compat_flock struct to userland, which results in corruption of the userland word after the struct flock when running 32-bit userlands on 64-bit kernels. This was observed to cause a bus error exception when starting Firefox on Debian 8 (Jessie). Reported-by: NPeter Mamonov <pmamonov@gmail.com> Signed-off-by: NJames Hogan <jhogan@kernel.org> Tested-by: NPeter Mamonov <pmamonov@gmail.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-mips@linux-mips.org Cc: <stable@vger.kernel.org> # 4.13+ Patchwork: https://patchwork.linux-mips.org/patch/18646/
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