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For example it's likely to have an empty .altinstr_replacement with symbols pointing to it, and marking the section as ignored will prevent the symbols from being resolved, which in turn will cause any relocations against them to fail. In order to solve this do not ignore sections with 0 size, only ignore sections that don't have the SHF_ALLOC flag set. Special case such empty sections in move_payload so they are not taken into account in order to decide whether a livepatch can be safely re-applied after a revert. Fixes: 98b728a7b2 ('livepatch: Disallow applying after an revert') Signed-off-by: Roger Pau Monn=C3=A9 Reviewed-by: Ross Lagerwall --- xen/common/livepatch.c | 16 +++++++++++----- xen/include/xen/livepatch_elf.h | 2 +- 2 files changed, 12 insertions(+), 6 deletions(-) diff --git a/xen/common/livepatch.c b/xen/common/livepatch.c index be2cf75c2d..abc1cae136 100644 --- a/xen/common/livepatch.c +++ b/xen/common/livepatch.c @@ -300,9 +300,6 @@ static int move_payload(struct payload *payload, struct= livepatch_elf *elf) * and .shstrtab. For the non-relocate we allocate and copy these * via other means - and the .rel we can ignore as we only use it * once during loading. - * - * Also ignore sections with zero size. Those can be for example: - * data, or .bss. */ if ( livepatch_elf_ignore_section(elf->sec[i].sec) ) offset[i] =3D UINT_MAX; @@ -361,8 +358,17 @@ static int move_payload(struct payload *payload, struc= t livepatch_elf *elf) else if ( elf->sec[i].sec->sh_flags & SHF_WRITE ) { buf =3D rw_buf; - rw_buf_sec =3D i; - rw_buf_cnt++; + if ( elf->sec[i].sec->sh_size ) + { + /* + * Special handling of RW empty regions: do not accoun= t for + * them in order to decide whether a patch can safely = be + * re-applied, but assign them a load address so symbol + * resolution and relocations work. + */ + rw_buf_sec =3D i; + rw_buf_cnt++; + } } else buf =3D ro_buf; diff --git a/xen/include/xen/livepatch_elf.h b/xen/include/xen/livepatch_el= f.h index 9ad499ee8b..5b1ec469da 100644 --- a/xen/include/xen/livepatch_elf.h +++ b/xen/include/xen/livepatch_elf.h @@ -48,7 +48,7 @@ int livepatch_elf_perform_relocs(struct livepatch_elf *el= f); =20 static inline bool livepatch_elf_ignore_section(const Elf_Shdr *sec) { - return !(sec->sh_flags & SHF_ALLOC) || sec->sh_size =3D=3D 0; 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The address of such symbols won't be resolved and thus the relocation will likely fail or write garbage to the destination. Return an error in that case, as leaving unresolved relocations would lead to malfunctioning payload code. Signed-off-by: Roger Pau Monn=C3=A9 Reviewed-by: Jan Beulich Reviewed-by: Ross Lagerwall --- xen/arch/arm/arm32/livepatch.c | 7 +++++++ xen/arch/arm/arm64/livepatch.c | 7 +++++++ xen/arch/x86/livepatch.c | 7 +++++++ xen/common/livepatch_elf.c | 6 ++++++ xen/include/xen/livepatch_elf.h | 1 + 5 files changed, 28 insertions(+) diff --git a/xen/arch/arm/arm32/livepatch.c b/xen/arch/arm/arm32/livepatch.c index 5a06467008..6aed227818 100644 --- a/xen/arch/arm/arm32/livepatch.c +++ b/xen/arch/arm/arm32/livepatch.c @@ -272,6 +272,13 @@ int arch_livepatch_perform(struct livepatch_elf *elf, elf->name, symndx); return -EINVAL; } + else if ( elf->sym[symndx].ignored ) + { + printk(XENLOG_ERR LIVEPATCH + "%s: Relocation against ignored symbol %s cannot be re= solved\n", + elf->name, elf->sym[symndx].name); + return -EINVAL; + } =20 val =3D elf->sym[symndx].sym->st_value; /* S */ =20 diff --git a/xen/arch/arm/arm64/livepatch.c b/xen/arch/arm/arm64/livepatch.c index 6ec8dc60f0..655ded33d2 100644 --- a/xen/arch/arm/arm64/livepatch.c +++ b/xen/arch/arm/arm64/livepatch.c @@ -270,6 +270,13 @@ int arch_livepatch_perform_rela(struct livepatch_elf *= elf, elf->name, symndx); return -EINVAL; } + else if ( elf->sym[symndx].ignored ) + { + printk(XENLOG_ERR LIVEPATCH + "%s: Relocation against ignored symbol %s cannot be re= solved\n", + elf->name, elf->sym[symndx].name); + return -EINVAL; + } =20 val =3D elf->sym[symndx].sym->st_value + r->r_addend; /* S+A */ =20 diff --git a/xen/arch/x86/livepatch.c b/xen/arch/x86/livepatch.c index 37c9b8435e..a928e5bfcd 100644 --- a/xen/arch/x86/livepatch.c +++ b/xen/arch/x86/livepatch.c @@ -262,6 +262,13 @@ int arch_livepatch_perform_rela(struct livepatch_elf *= elf, elf->name, symndx); return -EINVAL; } + else if ( elf->sym[symndx].ignored ) + { + printk(XENLOG_ERR LIVEPATCH + "%s: Relocation against ignored symbol %s cannot be re= solved\n", + elf->name, elf->sym[symndx].name); + return -EINVAL; + } =20 val =3D r->r_addend + elf->sym[symndx].sym->st_value; =20 diff --git a/xen/common/livepatch_elf.c b/xen/common/livepatch_elf.c index b089cacb1c..45d73912a3 100644 --- a/xen/common/livepatch_elf.c +++ b/xen/common/livepatch_elf.c @@ -334,7 +334,13 @@ int livepatch_elf_resolve_symbols(struct livepatch_elf= *elf) } =20 if ( livepatch_elf_ignore_section(elf->sec[idx].sec) ) + { + dprintk(XENLOG_DEBUG, LIVEPATCH + "%s: Symbol %s from section %s ignored\n", + elf->name, elf->sym[i].name, elf->sec[idx].name); + elf->sym[i].ignored =3D true; break; + } =20 st_value +=3D (unsigned long)elf->sec[idx].load_addr; if ( elf->sym[i].name ) diff --git a/xen/include/xen/livepatch_elf.h b/xen/include/xen/livepatch_el= f.h index 5b1ec469da..7116deaddc 100644 --- a/xen/include/xen/livepatch_elf.h +++ b/xen/include/xen/livepatch_elf.h @@ -22,6 +22,7 @@ struct livepatch_elf_sec { struct livepatch_elf_sym { const Elf_Sym *sym; const char *name; + bool ignored; }; =20 struct livepatch_elf { --=20 2.34.1