Accepting request 792408 from home:michael-chang:gcc10
- Fix GCC 10 build fail (bsc#1158189) * 0001-mdraid1x_linux-Fix-gcc10-error-Werror-array-bounds.patch * 0002-zfs-Fix-gcc10-error-Werror-zero-length-bounds.patch OBS-URL: https://build.opensuse.org/request/show/792408 OBS-URL: https://build.opensuse.org/package/show/Base:System/grub2?expand=0&rev=353
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Michael Chang
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From fe8a83722bf1af7ea3949e6d96e7906407f78d5c Mon Sep 17 00:00:00 2001
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From: Michael Chang <mchang@suse.com>
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Date: Wed, 25 Mar 2020 13:52:51 +0800
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Subject: [PATCH 1/2] mdraid1x_linux: Fix gcc10 error -Werror=array-bounds
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We bumped into the build error while testing gcc-10 pre-release.
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../../grub-core/disk/mdraid1x_linux.c: In function 'grub_mdraid_detect':
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../../grub-core/disk/mdraid1x_linux.c:181:15: error: array subscript <unknown> is outside array bounds of 'grub_uint16_t[0]' {aka 'short unsigned int[0]'} [-Werror=array-bounds]
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181 | (char *) &sb.dev_roles[grub_le_to_cpu32 (sb.dev_number)]
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| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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../../grub-core/disk/mdraid1x_linux.c:98:17: note: while referencing 'dev_roles'
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98 | grub_uint16_t dev_roles[0]; /* Role in array, or 0xffff for a spare, or 0xfffe for faulty. */
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| ^~~~~~~~~
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../../grub-core/disk/mdraid1x_linux.c:127:33: note: defined here 'sb'
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127 | struct grub_raid_super_1x sb;
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| ^~
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cc1: all warnings being treated as errors
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Apparently gcc issues the warning when trying to access sb.dev_roles
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array's member, since it is a zero length array as the last element of
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struct grub_raid_super_1x that is allocated sparsely without extra
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chunks for the trailing bits, so the warning looks legitimate in this
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regard.
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As the whole thing here is doing offset computation, it is undue to use
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syntax that would imply array member access then take address from it
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later. Instead we could accomplish the same thing through basic array
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pointer arithmetic to pacify the warning.
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Signed-off-by: Michael Chang <mchang@suse.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/disk/mdraid1x_linux.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/grub-core/disk/mdraid1x_linux.c b/grub-core/disk/mdraid1x_linux.c
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index 7cc80d3df..c980feba4 100644
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--- a/grub-core/disk/mdraid1x_linux.c
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+++ b/grub-core/disk/mdraid1x_linux.c
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@@ -178,7 +178,7 @@ grub_mdraid_detect (grub_disk_t disk,
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return NULL;
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if (grub_disk_read (disk, sector,
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- (char *) &sb.dev_roles[grub_le_to_cpu32 (sb.dev_number)]
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+ (char *) (sb.dev_roles + grub_le_to_cpu32 (sb.dev_number))
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- (char *) &sb,
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sizeof (role), &role))
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return NULL;
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--
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2.16.4
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87
0002-zfs-Fix-gcc10-error-Werror-zero-length-bounds.patch
Normal file
87
0002-zfs-Fix-gcc10-error-Werror-zero-length-bounds.patch
Normal file
@ -0,0 +1,87 @@
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From 30379c2280c5b4514abafc2492e081209a330cb0 Mon Sep 17 00:00:00 2001
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From: Michael Chang <mchang@suse.com>
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Date: Wed, 25 Mar 2020 14:28:15 +0800
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Subject: [PATCH 2/2] zfs: Fix gcc10 error -Werror=zero-length-bounds
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We bumped into the build error while testing gcc-10 pre-release.
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In file included from ../../include/grub/file.h:22,
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from ../../grub-core/fs/zfs/zfs.c:34:
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../../grub-core/fs/zfs/zfs.c: In function 'zap_leaf_lookup':
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../../grub-core/fs/zfs/zfs.c:2263:44: error: array subscript '<unknown>' is outside the bounds of an interior zero-length array 'grub_uint16_t[0]' {aka 'short unsigned int[0]'} [-Werror=zero-length-bounds]
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2263 | for (chunk = grub_zfs_to_cpu16 (l->l_hash[LEAF_HASH (blksft, h, l)], endian);
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../../include/grub/types.h:241:48: note: in definition of macro 'grub_le_to_cpu16'
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241 | # define grub_le_to_cpu16(x) ((grub_uint16_t) (x))
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| ^
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../../grub-core/fs/zfs/zfs.c:2263:16: note: in expansion of macro 'grub_zfs_to_cpu16'
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2263 | for (chunk = grub_zfs_to_cpu16 (l->l_hash[LEAF_HASH (blksft, h, l)], endian);
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| ^~~~~~~~~~~~~~~~~
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In file included from ../../grub-core/fs/zfs/zfs.c:48:
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../../include/grub/zfs/zap_leaf.h:72:16: note: while referencing 'l_hash'
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72 | grub_uint16_t l_hash[0];
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| ^~~~~~
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Here I'd like to quote from the gcc document [1] which seems best to
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explain what is going on here.
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"Although the size of a zero-length array is zero, an array member of
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this kind may increase the size of the enclosing type as a result of
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tail padding. The offset of a zero-length array member from the
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beginning of the enclosing structure is the same as the offset of an
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array with one or more elements of the same type. The alignment of a
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zero-length array is the same as the alignment of its elements.
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Declaring zero-length arrays in other contexts, including as interior
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members of structure objects or as non-member objects, is discouraged.
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Accessing elements of zero-length arrays declared in such contexts is
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undefined and may be diagnosed."
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The l_hash[0] is apparnetly an interior member to the enclosed structure
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while l_entries[0] is the trailing member. And the offending code tries
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to access members in l_hash[0] array that triggers the diagnose.
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Given that the l_entries[0] is used to get proper alignment to access
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leaf chunks, we can accomplish the same thing through the ALIGN_UP macro
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thus eliminating l_entries[0] from the structure. In this way we can
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pacify the warning as l_hash[0] now becomes the last member to the
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enclosed structure.
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[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
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Signed-off-by: Michael Chang <mchang@suse.com>
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---
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grub-core/fs/zfs/zfs.c | 5 ++++-
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include/grub/zfs/zap_leaf.h | 1 -
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2 files changed, 4 insertions(+), 2 deletions(-)
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diff --git a/grub-core/fs/zfs/zfs.c b/grub-core/fs/zfs/zfs.c
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index 2f72e42bf..b5e10fd0b 100644
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--- a/grub-core/fs/zfs/zfs.c
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+++ b/grub-core/fs/zfs/zfs.c
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@@ -141,7 +141,10 @@ ZAP_LEAF_NUMCHUNKS (int bs)
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static inline zap_leaf_chunk_t *
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ZAP_LEAF_CHUNK (zap_leaf_phys_t *l, int bs, int idx)
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{
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- return &((zap_leaf_chunk_t *) (l->l_entries
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+ grub_properly_aligned_t *l_entries;
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+
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+ l_entries = (grub_properly_aligned_t *) ALIGN_UP((grub_addr_t)l->l_hash, sizeof (grub_properly_aligned_t));
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+ return &((zap_leaf_chunk_t *) (l_entries
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+ (ZAP_LEAF_HASH_NUMENTRIES(bs) * 2)
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/ sizeof (grub_properly_aligned_t)))[idx];
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}
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diff --git a/include/grub/zfs/zap_leaf.h b/include/grub/zfs/zap_leaf.h
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index 95c67dcba..11447c166 100644
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--- a/include/grub/zfs/zap_leaf.h
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+++ b/include/grub/zfs/zap_leaf.h
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@@ -70,7 +70,6 @@ typedef struct zap_leaf_phys {
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*/
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grub_uint16_t l_hash[0];
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- grub_properly_aligned_t l_entries[0];
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} zap_leaf_phys_t;
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typedef union zap_leaf_chunk {
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--
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2.16.4
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@ -1,3 +1,10 @@
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-------------------------------------------------------------------
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Tue Mar 24 08:17:33 UTC 2020 - Michael Chang <mchang@suse.com>
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- Fix GCC 10 build fail (bsc#1158189)
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* 0001-mdraid1x_linux-Fix-gcc10-error-Werror-array-bounds.patch
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* 0002-zfs-Fix-gcc10-error-Werror-zero-length-bounds.patch
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-------------------------------------------------------------------
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Fri Mar 20 10:36:54 UTC 2020 - Michael Chang <mchang@suse.com>
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@ -291,6 +291,9 @@ Patch511: grub2-gfxmenu-support-scrolling-menu-entry-s-text.patch
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Patch601: risc-v-fix-computation-of-pc-relative-relocation-offset.patch
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Patch602: risc-v-add-clzdi2-symbol.patch
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Patch603: grub-install-define-default-platform-for-risc-v.patch
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# Fix gcc-10 build fail
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Patch610: 0001-mdraid1x_linux-Fix-gcc10-error-Werror-array-bounds.patch
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Patch611: 0002-zfs-Fix-gcc10-error-Werror-zero-length-bounds.patch
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# bsc#1166409 - Grub netbooting does not search for grub.cfg files with mac
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# address or ip address in filename
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Patch700: 0001-normal-Move-common-datetime-functions-out-of-the-nor.patch
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@ -594,6 +597,8 @@ swap partition while in resuming
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%patch601 -p1
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%patch602 -p1
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%patch603 -p1
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%patch610 -p1
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%patch611 -p1
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%patch700 -p1
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%patch701 -p1
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%patch702 -p1
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