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author | Vasant Hegde <hegdevasant@linux.vnet.ibm.com> | 2015-10-16 15:53:29 +0530 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-11-09 10:12:58 -0800 |
commit | f61004603b14328d8ab7bf4dbbcc21df7c889c20 (patch) | |
tree | 3e5c85f79517636dffde74c8d5812da6ca54da33 /include/sound/cs4271.h | |
parent | 8e7439f32a99a5600fd8d37ca2cc1e93ea6766c1 (diff) |
powerpc/rtas: Validate rtas.entry before calling enter_rtas()
commit 8832317f662c06f5c06e638f57bfe89a71c9b266 upstream.
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
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/sound/cs4271.h')
0 files changed, 0 insertions, 0 deletions