diff options
Diffstat (limited to 'system/xen/xsa/xsa345-0001-x86-mm-Refactor-map_pages_to_xen-to-have-only-a-sing.patch')
| -rw-r--r-- | system/xen/xsa/xsa345-0001-x86-mm-Refactor-map_pages_to_xen-to-have-only-a-sing.patch | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/system/xen/xsa/xsa345-0001-x86-mm-Refactor-map_pages_to_xen-to-have-only-a-sing.patch b/system/xen/xsa/xsa345-0001-x86-mm-Refactor-map_pages_to_xen-to-have-only-a-sing.patch new file mode 100644 index 0000000000..d325385a56 --- /dev/null +++ b/system/xen/xsa/xsa345-0001-x86-mm-Refactor-map_pages_to_xen-to-have-only-a-sing.patch @@ -0,0 +1,94 @@ +From b3e0d4e37b7902533a463812374947d4d6d2e463 Mon Sep 17 00:00:00 2001 +From: Wei Liu <wei.liu2@citrix.com> +Date: Sat, 11 Jan 2020 21:57:41 +0000 +Subject: [PATCH 1/3] x86/mm: Refactor map_pages_to_xen to have only a single + exit path + +We will soon need to perform clean-ups before returning. + +No functional change. + +This is part of XSA-345. + +Reported-by: Hongyan Xia <hongyxia@amazon.com> +Signed-off-by: Wei Liu <wei.liu2@citrix.com> +Signed-off-by: Hongyan Xia <hongyxia@amazon.com> +Signed-off-by: George Dunlap <george.dunlap@citrix.com> +Acked-by: Jan Beulich <jbeulich@suse.com> +--- + xen/arch/x86/mm.c | 17 +++++++++++------ + 1 file changed, 11 insertions(+), 6 deletions(-) + +diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c +index 30dffb68e8..133a393875 100644 +--- a/xen/arch/x86/mm.c ++++ b/xen/arch/x86/mm.c +@@ -5187,6 +5187,7 @@ int map_pages_to_xen( + l2_pgentry_t *pl2e, ol2e; + l1_pgentry_t *pl1e, ol1e; + unsigned int i; ++ int rc = -ENOMEM; + + #define flush_flags(oldf) do { \ + unsigned int o_ = (oldf); \ +@@ -5207,7 +5208,8 @@ int map_pages_to_xen( + l3_pgentry_t ol3e, *pl3e = virt_to_xen_l3e(virt); + + if ( !pl3e ) +- return -ENOMEM; ++ goto out; ++ + ol3e = *pl3e; + + if ( cpu_has_page1gb && +@@ -5295,7 +5297,7 @@ int map_pages_to_xen( + + pl2e = alloc_xen_pagetable(); + if ( pl2e == NULL ) +- return -ENOMEM; ++ goto out; + + for ( i = 0; i < L2_PAGETABLE_ENTRIES; i++ ) + l2e_write(pl2e + i, +@@ -5324,7 +5326,7 @@ int map_pages_to_xen( + + pl2e = virt_to_xen_l2e(virt); + if ( !pl2e ) +- return -ENOMEM; ++ goto out; + + if ( ((((virt >> PAGE_SHIFT) | mfn_x(mfn)) & + ((1u << PAGETABLE_ORDER) - 1)) == 0) && +@@ -5367,7 +5369,7 @@ int map_pages_to_xen( + { + pl1e = virt_to_xen_l1e(virt); + if ( pl1e == NULL ) +- return -ENOMEM; ++ goto out; + } + else if ( l2e_get_flags(*pl2e) & _PAGE_PSE ) + { +@@ -5394,7 +5396,7 @@ int map_pages_to_xen( + + pl1e = alloc_xen_pagetable(); + if ( pl1e == NULL ) +- return -ENOMEM; ++ goto out; + + for ( i = 0; i < L1_PAGETABLE_ENTRIES; i++ ) + l1e_write(&pl1e[i], +@@ -5538,7 +5540,10 @@ int map_pages_to_xen( + + #undef flush_flags + +- return 0; ++ rc = 0; ++ ++ out: ++ return rc; + } + + int populate_pt_range(unsigned long virt, unsigned long nr_mfns) +-- +2.25.1 + |