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authorLinus Torvalds <torvalds@linux-foundation.org>2019-03-31 07:44:13 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-03-31 07:44:13 -0700
commit6536c5f2c8cf79db0d37e79afcdb227dc854509c (patch)
tree8a6e11e6d7768eef8f24215598fd3aa8c1120c5e /arch
parentc877b3df8527f010ef068704033acac1d43cbf8c (diff)
parent6f845ebec2706841d15831fab3ffffcfd9e676fa (diff)
downloadlinux-stericsson-6536c5f2c8cf79db0d37e79afcdb227dc854509c.tar.gz
Merge tag 'powerpc-5.1-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc fixes from Michael Ellerman: "Three non-regression fixes. - Our optimised memcmp could read past the end of one of the buffers and potentially trigger a page fault leading to an oops. - Some of our code to read energy management data on PowerVM had an endian bug leading to bogus results. - When reporting a machine check exception we incorrectly reported TLB multihits as D-Cache multhits due to a missing entry in the array of causes. Thanks to: Chandan Rajendra, Gautham R. Shenoy, Mahesh Salgaonkar, Segher Boessenkool, Vaidyanathan Srinivasan" * tag 'powerpc-5.1-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: powerpc/pseries/mce: Fix misleading print for TLB mutlihit powerpc/pseries/energy: Use OF accessor functions to read ibm,drc-indexes powerpc/64: Fix memcmp reading past the end of src/dest
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/lib/memcmp_64.S17
-rw-r--r--arch/powerpc/platforms/pseries/pseries_energy.c27
-rw-r--r--arch/powerpc/platforms/pseries/ras.c1
3 files changed, 32 insertions, 13 deletions
diff --git a/arch/powerpc/lib/memcmp_64.S b/arch/powerpc/lib/memcmp_64.S
index 844d8e774492..b7f6f6e0b6e8 100644
--- a/arch/powerpc/lib/memcmp_64.S
+++ b/arch/powerpc/lib/memcmp_64.S
@@ -215,11 +215,20 @@ _GLOBAL_TOC(memcmp)
beq .Lzero
.Lcmp_rest_lt8bytes:
- /* Here we have only less than 8 bytes to compare with. at least s1
- * Address is aligned with 8 bytes.
- * The next double words are load and shift right with appropriate
- * bits.
+ /*
+ * Here we have less than 8 bytes to compare. At least s1 is aligned to
+ * 8 bytes, but s2 may not be. We must make sure s2 + 7 doesn't cross a
+ * page boundary, otherwise we might read past the end of the buffer and
+ * trigger a page fault. We use 4K as the conservative minimum page
+ * size. If we detect that case we go to the byte-by-byte loop.
+ *
+ * Otherwise the next double word is loaded from s1 and s2, and shifted
+ * right to compare the appropriate bits.
*/
+ clrldi r6,r4,(64-12) // r6 = r4 & 0xfff
+ cmpdi r6,0xff8
+ bgt .Lshort
+
subfic r6,r5,8
slwi r6,r6,3
LD rA,0,r3
diff --git a/arch/powerpc/platforms/pseries/pseries_energy.c b/arch/powerpc/platforms/pseries/pseries_energy.c
index 6ed22127391b..921f12182f3e 100644
--- a/arch/powerpc/platforms/pseries/pseries_energy.c
+++ b/arch/powerpc/platforms/pseries/pseries_energy.c
@@ -77,18 +77,27 @@ static u32 cpu_to_drc_index(int cpu)
ret = drc.drc_index_start + (thread_index * drc.sequential_inc);
} else {
- const __be32 *indexes;
-
- indexes = of_get_property(dn, "ibm,drc-indexes", NULL);
- if (indexes == NULL)
- goto err_of_node_put;
+ u32 nr_drc_indexes, thread_drc_index;
/*
- * The first element indexes[0] is the number of drc_indexes
- * returned in the list. Hence thread_index+1 will get the
- * drc_index corresponding to core number thread_index.
+ * The first element of ibm,drc-indexes array is the
+ * number of drc_indexes returned in the list. Hence
+ * thread_index+1 will get the drc_index corresponding
+ * to core number thread_index.
*/
- ret = indexes[thread_index + 1];
+ rc = of_property_read_u32_index(dn, "ibm,drc-indexes",
+ 0, &nr_drc_indexes);
+ if (rc)
+ goto err_of_node_put;
+
+ WARN_ON_ONCE(thread_index > nr_drc_indexes);
+ rc = of_property_read_u32_index(dn, "ibm,drc-indexes",
+ thread_index + 1,
+ &thread_drc_index);
+ if (rc)
+ goto err_of_node_put;
+
+ ret = thread_drc_index;
}
rc = 0;
diff --git a/arch/powerpc/platforms/pseries/ras.c b/arch/powerpc/platforms/pseries/ras.c
index d97d52772789..452dcfd7e5dd 100644
--- a/arch/powerpc/platforms/pseries/ras.c
+++ b/arch/powerpc/platforms/pseries/ras.c
@@ -550,6 +550,7 @@ static void pseries_print_mce_info(struct pt_regs *regs,
"UE",
"SLB",
"ERAT",
+ "Unknown",
"TLB",
"D-Cache",
"Unknown",