diff options
| author | Mathias Krause <minipli@googlemail.com> | 2017-04-10 15:14:27 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-04-21 07:31:20 (GMT) |
| commit | ec980b6f7dcc006f6859c0871c0d7298281f0394 (patch) | |
| tree | faef2f5a91d9d61a83a75821b18f05c42917b136 /lib/once.c | |
| parent | a9826aa4860a9ca1268a9ab5c10fc5e65a72b4ef (diff) | |
| download | linux-ec980b6f7dcc006f6859c0871c0d7298281f0394.tar.xz | |
x86/vdso: Ensure vdso32_enabled gets set to valid values only
commit c06989da39cdb10604d572c8c7ea8c8c97f3c483 upstream.
vdso_enabled can be set to arbitrary integer values via the kernel command
line 'vdso32=' parameter or via 'sysctl abi.vsyscall32'.
load_vdso32() only maps VDSO if vdso_enabled == 1, but ARCH_DLINFO_IA32
merily checks for vdso_enabled != 0. As a consequence the AT_SYSINFO_EHDR
auxiliary vector for the VDSO_ENTRY is emitted with a NULL pointer which
causes a segfault when the application tries to use the VDSO.
Restrict the valid arguments on the command line and the sysctl to 0 and 1.
Fixes: b0b49f2673f0 ("x86, vdso: Remove compat vdso support")
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Acked-by: Andy Lutomirski <luto@amacapital.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Roland McGrath <roland@redhat.com>
Link: http://lkml.kernel.org/r/1491424561-7187-1-git-send-email-minipli@googlemail.com
Link: http://lkml.kernel.org/r/20170410151723.518412863@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib/once.c')
0 files changed, 0 insertions, 0 deletions