https://github.com/torvalds/linux
Revision 8832317f662c06f5c06e638f57bfe89a71c9b266 authored by Vasant Hegde on 16 October 2015, 10:23:29 UTC, committed by Michael Ellerman on 22 October 2015, 00:03:25 UTC
Currently we do not validate rtas.entry before calling enter_rtas(). This
leads to a kernel oops when user space calls rtas system call on a powernv
platform (see below). This patch adds code to validate rtas.entry before
making enter_rtas() call.
Oops: Exception in kernel mode, sig: 4 [#1]
SMP NR_CPUS=1024 NUMA PowerNV
task: c000000004294b80 ti: c0000007e1a78000 task.ti: c0000007e1a78000
NIP: 0000000000000000 LR: 0000000000009c14 CTR: c000000000423140
REGS: c0000007e1a7b920 TRAP: 0e40 Not tainted (3.18.17-340.el7_1.pkvm3_1_0.2400.1.ppc64le)
MSR: 1000000000081000 <HV,ME> CR: 00000000 XER: 00000000
CFAR: c000000000009c0c SOFTE: 0
NIP [0000000000000000] (null)
LR [0000000000009c14] 0x9c14
Call Trace:
[c0000007e1a7bba0] [c00000000041a7f4] avc_has_perm_noaudit+0x54/0x110 (unreliable)
[c0000007e1a7bd80] [c00000000002ddc0] ppc_rtas+0x150/0x2d0
[c0000007e1a7be30] [c000000000009358] syscall_exit+0x0/0x98
Cc: stable@vger.kernel.org # v3.2+
Fixes: 55190f88789a ("powerpc: Add skeleton PowerNV platform")
Reported-by: NAGESWARA R. SASTRY <nasastry@in.ibm.com>
Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
[mpe: Reword change log, trim oops, and add stable + fixes]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
1 parent 53c656c
Tip revision: 8832317f662c06f5c06e638f57bfe89a71c9b266 authored by Vasant Hegde on 16 October 2015, 10:23:29 UTC
powerpc/rtas: Validate rtas.entry before calling enter_rtas()
powerpc/rtas: Validate rtas.entry before calling enter_rtas()
Tip revision: 8832317
| File | Mode | Size |
|---|---|---|
| Kconfig | -rw-r--r-- | 640 bytes |
| Makefile | -rw-r--r-- | 207 bytes |
| alloc.c | -rw-r--r-- | 14.3 KB |
| anode.c | -rw-r--r-- | 15.4 KB |
| buffer.c | -rw-r--r-- | 5.3 KB |
| dentry.c | -rw-r--r-- | 1.4 KB |
| dir.c | -rw-r--r-- | 8.6 KB |
| dnode.c | -rw-r--r-- | 30.4 KB |
| ea.c | -rw-r--r-- | 11.4 KB |
| file.c | -rw-r--r-- | 5.5 KB |
| hpfs.h | -rw-r--r-- | 17.9 KB |
| hpfs_fn.h | -rw-r--r-- | 12.9 KB |
| inode.c | -rw-r--r-- | 8.8 KB |
| map.c | -rw-r--r-- | 9.7 KB |
| name.c | -rw-r--r-- | 3.1 KB |
| namei.c | -rw-r--r-- | 16.3 KB |
| super.c | -rw-r--r-- | 19.4 KB |
Computing file changes ...
