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[Xen-devel] Re: [Xen-staging] [xen-unstable] ia64 and ppc: Remove uses of strcpy and strncpy.



Hi Christoph,

Was this patch floated on xen-devel and/or xen-ia64-devel?  I'm having
trouble finding it, and I think I'm seeing some problems in it, see
below.

Aron

Xen staging patchbot-unstable wrote:  [Mon Jan 29 2007, 10:02:21AM EST]
> # HG changeset patch
> # User kfraser@xxxxxxxxxxxxxxxxxxxxx
> # Date 1170082893 0
> # Node ID d2784d93e760ad96ab25cb7cacee491177708ce0
> # Parent  bef7fbe25a9f380d40623795befacd447b026837
> ia64 and ppc: Remove uses of strcpy and strncpy.
> Signed-off-by: Christoph Egger <Christoph.Egger@xxxxxxx>
> ---
>  xen/arch/ia64/linux-xen/setup.c      |    5 +--
>  xen/arch/ia64/xen/dom_fw.c           |   49 
> +++++++++++++++++++----------------
>  xen/arch/ia64/xen/domain.c           |    3 --
>  xen/arch/ia64/xen/gdbstub.c          |    2 -
>  xen/arch/ia64/xen/oprofile/perfmon.c |    2 -
>  xen/arch/powerpc/domain_build.c      |    2 -
>  xen/arch/powerpc/of-devtree.c        |    3 --
>  xen/arch/powerpc/ofd_fixup.c         |    2 -
>  8 files changed, 35 insertions(+), 33 deletions(-)
> 
> diff -r bef7fbe25a9f -r d2784d93e760 xen/arch/ia64/linux-xen/setup.c
> --- a/xen/arch/ia64/linux-xen/setup.c Mon Jan 29 14:59:42 2007 +0000
> +++ b/xen/arch/ia64/linux-xen/setup.c Mon Jan 29 15:01:33 2007 +0000
> @@ -424,8 +424,7 @@ setup_arch (char **cmdline_p)
>                       else
>                               len = strlen (mvec_name);
>                       len = min(len, sizeof (str) - 1);
> -                     strncpy (str, mvec_name, len);
> -                     str[len] = '\0';
> +                     strlcpy (str, mvec_name, len);
>                       mvec_name = str;
>               } else
>                       mvec_name = acpi_get_sysname();
> @@ -564,7 +563,7 @@ show_cpuinfo (struct seq_file *m, void *
>                               *cp++ = sep;
>                       sep = ',';
>                       *cp++ = ' ';
> -                     strcpy(cp, feature_bits[i].feature_name);
> +                     strlcpy(cp, feature_bits[i].feature_name, 
> sizeof(features));
>                       cp += strlen(feature_bits[i].feature_name);
>                       mask &= ~feature_bits[i].mask;
>               }
> diff -r bef7fbe25a9f -r d2784d93e760 xen/arch/ia64/xen/dom_fw.c
> --- a/xen/arch/ia64/xen/dom_fw.c      Mon Jan 29 14:59:42 2007 +0000
> +++ b/xen/arch/ia64/xen/dom_fw.c      Mon Jan 29 15:01:33 2007 +0000
> @@ -333,13 +333,13 @@ dom_fw_fake_acpi(struct domain *d, struc
>       memset(tables, 0, sizeof(struct fake_acpi_tables));
>  
>       /* setup XSDT (64bit version of RSDT) */
> -     strncpy(xsdt->signature, XSDT_SIG, 4);
> +     strlcpy(xsdt->signature, XSDT_SIG, sizeof(xsdt->signature));

Since xsdt->signature is 4 bytes, strncpy() worked fine and
appropriately left off the trailing NUL.  Switching to strlcpy()
forces the NUL onto the end, truncating the content to 3 bytes.

>       /* XSDT points to both the FADT and the MADT, so add one entry */
>       xsdt->length = sizeof(struct xsdt_descriptor_rev2) + sizeof(u64);
>       xsdt->revision = 1;
> -     strcpy(xsdt->oem_id, "XEN");
> -     strcpy(xsdt->oem_table_id, "Xen/ia64");
> -     strcpy(xsdt->asl_compiler_id, "XEN");
> +     strlcpy(xsdt->oem_id, "XEN", sizeof(xsdt->oem_id));
> +     strlcpy(xsdt->oem_table_id, "Xen/ia64", sizeof(xsdt->oem_table_id));
> +     strlcpy(xsdt->asl_compiler_id, "XEN", sizeof(xsdt->asl_compiler_id));
>       xsdt->asl_compiler_revision = (xen_major_version() << 16) |
>               xen_minor_version();
>  
> @@ -349,16 +349,16 @@ dom_fw_fake_acpi(struct domain *d, struc
>       xsdt->checksum = generate_acpi_checksum(xsdt, xsdt->length);
>  
>       /* setup FADT */
> -     strncpy(fadt->signature, FADT_SIG, 4);
> +     strlcpy(fadt->signature, FADT_SIG, sizeof(fadt->signature));

again

>       fadt->length = sizeof(struct fadt_descriptor_rev2);
>       fadt->revision = FADT2_REVISION_ID;
> -     strcpy(fadt->oem_id, "XEN");
> -     strcpy(fadt->oem_table_id, "Xen/ia64");
> -     strcpy(fadt->asl_compiler_id, "XEN");
> +     strlcpy(fadt->oem_id, "XEN", sizeof(fadt->oem_id));
> +     strlcpy(fadt->oem_table_id, "Xen/ia64", sizeof(fadt->oem_table_id));
> +     strlcpy(fadt->asl_compiler_id, "XEN", sizeof(fadt->asl_compiler_id));
>       fadt->asl_compiler_revision = (xen_major_version() << 16) |
>               xen_minor_version();
>  
> -     strncpy(facs->signature, FACS_SIG, 4);
> +     strlcpy(facs->signature, FACS_SIG, sizeof(facs->signature));

again

>       facs->version = 1;
>       facs->length = sizeof(struct facs_descriptor_rev2);
>  
> @@ -386,8 +386,8 @@ dom_fw_fake_acpi(struct domain *d, struc
>       fadt->checksum = generate_acpi_checksum(fadt, fadt->length);
>  
>       /* setup RSDP */
> -     strncpy(rsdp->signature, RSDP_SIG, 8);
> -     strcpy(rsdp->oem_id, "XEN");
> +     strlcpy(rsdp->signature, RSDP_SIG, sizeof(rsdp->signature));

again

> +     strlcpy(rsdp->oem_id, "XEN", sizeof(rsdp->oem_id));
>       rsdp->revision = 2; /* ACPI 2.0 includes XSDT */
>       rsdp->length = sizeof(struct acpi20_table_rsdp);
>       rsdp->xsdt_address = ACPI_TABLE_MPA(xsdt);
> @@ -397,11 +397,11 @@ dom_fw_fake_acpi(struct domain *d, struc
>       rsdp->ext_checksum = generate_acpi_checksum(rsdp, rsdp->length);
>  
>       /* setup DSDT with trivial namespace. */ 
> -     strncpy(dsdt->signature, DSDT_SIG, 4);
> +     strlcpy(dsdt->signature, DSDT_SIG, sizeof(dsdt->signature));

again

>       dsdt->revision = 1;
> -     strcpy(dsdt->oem_id, "XEN");
> -     strcpy(dsdt->oem_table_id, "Xen/ia64");
> -     strcpy(dsdt->asl_compiler_id, "XEN");
> +     strlcpy(dsdt->oem_id, "XEN", sizeof(dsdt->oem_id));
> +     strlcpy(dsdt->oem_table_id, "Xen/ia64", sizeof(dsdt->oem_table_id));
> +     strlcpy(dsdt->asl_compiler_id, "XEN", sizeof(dsdt->asl_compiler_id));
>       dsdt->asl_compiler_revision = (xen_major_version() << 16) |
>               xen_minor_version();
>  
> @@ -409,7 +409,7 @@ dom_fw_fake_acpi(struct domain *d, struc
>       tables->aml[0] = 0x10; /* Scope */
>       tables->aml[1] = 0x40; /* length/offset to next object (patched) */
>       tables->aml[2] = 0x00;
> -     strncpy((char *)&tables->aml[3], "_SB_", 4);
> +     strlcpy((char *)&tables->aml[3], "_SB_", 5);

again

>       /* The processor object isn't absolutely necessary, revist for SMP */
>       aml_len = 7;
> @@ -437,11 +437,14 @@ dom_fw_fake_acpi(struct domain *d, struc
>       dsdt->checksum = generate_acpi_checksum(dsdt, dsdt->length);
>  
>       /* setup MADT */
> -     strncpy(madt->header.signature, APIC_SIG, 4);
> +     strlcpy(madt->header.signature, APIC_SIG, 
> sizeof(madt->header.signature));

again

>       madt->header.revision = 2;
> -     strcpy(madt->header.oem_id, "XEN");
> -     strcpy(madt->header.oem_table_id, "Xen/ia64");
> -     strcpy(madt->header.asl_compiler_id, "XEN");
> +     strlcpy(madt->header.oem_id, "XEN",
> +             sizeof(madt->header.oem_id));
> +     strlcpy(madt->header.oem_table_id, "Xen/ia64",
> +             sizeof(madt->header.oem_table_id));
> +     strlcpy(madt->header.asl_compiler_id, "XEN",
> +             sizeof(madt->header.asl_compiler_id));
>       madt->header.asl_compiler_revision = (xen_major_version() << 16) |
>               xen_minor_version();
>  
> @@ -760,8 +763,10 @@ dom_fw_init(struct domain *d,
>       tables->sal_systab.sal_rev_major = 0;
>       tables->sal_systab.entry_count = 2;
>  
> -     strcpy((char *)tables->sal_systab.oem_id, "Xen/ia64");
> -     strcpy((char *)tables->sal_systab.product_id, "Xen/ia64");
> +     strlcpy((char *)tables->sal_systab.oem_id, "Xen/ia64",
> +             sizeof(tables->sal_systab.oem_id));
> +     strlcpy((char *)tables->sal_systab.product_id, "Xen/ia64",
> +             sizeof(tables->sal_systab.product_id));
>  
>       /* PAL entry point: */
>       tables->sal_ed.type = SAL_DESC_ENTRY_POINT;
> diff -r bef7fbe25a9f -r d2784d93e760 xen/arch/ia64/xen/domain.c
> --- a/xen/arch/ia64/xen/domain.c      Mon Jan 29 14:59:42 2007 +0000
> +++ b/xen/arch/ia64/xen/domain.c      Mon Jan 29 15:01:33 2007 +0000
> @@ -1148,8 +1148,7 @@ int construct_dom0(struct domain *d,
>       dom_fw_setup(d, bp_mpa, max_pages * PAGE_SIZE);
>  
>       /* Fill boot param.  */
> -     strncpy((char *)si->cmd_line, dom0_command_line, sizeof(si->cmd_line));
> -     si->cmd_line[sizeof(si->cmd_line)-1] = 0;
> +     strlcpy((char *)si->cmd_line, dom0_command_line, sizeof(si->cmd_line));
>  
>       bp = (struct ia64_boot_param *)((unsigned char *)si +
>                                       sizeof(start_info_t));
> diff -r bef7fbe25a9f -r d2784d93e760 xen/arch/ia64/xen/gdbstub.c
> --- a/xen/arch/ia64/xen/gdbstub.c     Mon Jan 29 14:59:42 2007 +0000
> +++ b/xen/arch/ia64/xen/gdbstub.c     Mon Jan 29 15:01:33 2007 +0000
> @@ -639,7 +639,7 @@ kgdb_get_reg(int regnum, struct unw_fram
>               outbuffer[size*2] = 0;
>       }
>       else
> -             strcpy(outbuffer, "E0");
> +             strlcpy(outbuffer, "E0", sizeof("E0"));
>  
>       return;
>  #else
> diff -r bef7fbe25a9f -r d2784d93e760 xen/arch/ia64/xen/oprofile/perfmon.c
> --- a/xen/arch/ia64/xen/oprofile/perfmon.c    Mon Jan 29 14:59:42 2007 +0000
> +++ b/xen/arch/ia64/xen/oprofile/perfmon.c    Mon Jan 29 15:01:33 2007 +0000
> @@ -119,7 +119,7 @@ xenoprof_arch_init(int *num_events, int 
>  xenoprof_arch_init(int *num_events, int *is_primary, char *cpu_type)
>  {
>      *num_events = 0;
> -    strncpy(cpu_type, get_cpu_type(), XENOPROF_CPU_TYPE_SIZE - 1);
> +    strlcpy(cpu_type, get_cpu_type(), XENOPROF_CPU_TYPE_SIZE);
>      cpu_type[XENOPROF_CPU_TYPE_SIZE - 1] = '\0';

This extra NUL is not needed with strlcpy

>      *is_primary = 0;
> diff -r bef7fbe25a9f -r d2784d93e760 xen/arch/powerpc/domain_build.c
> --- a/xen/arch/powerpc/domain_build.c Mon Jan 29 14:59:42 2007 +0000
> +++ b/xen/arch/powerpc/domain_build.c Mon Jan 29 15:01:33 2007 +0000
> @@ -290,7 +290,7 @@ int construct_dom0(struct domain *d,
>  
>      memset(si->cmd_line, 0, sizeof(si->cmd_line));
>      if ( cmdline != NULL )
> -        strncpy((char *)si->cmd_line, cmdline, sizeof(si->cmd_line)-1);
> +        strlcpy((char *)si->cmd_line, cmdline, sizeof(si->cmd_line));
>  
>      v->arch.ctxt.msr = msr;
>      v->arch.ctxt.pc = pc;
> diff -r bef7fbe25a9f -r d2784d93e760 xen/arch/powerpc/of-devtree.c
> --- a/xen/arch/powerpc/of-devtree.c   Mon Jan 29 14:59:42 2007 +0000
> +++ b/xen/arch/powerpc/of-devtree.c   Mon Jan 29 15:01:33 2007 +0000
> @@ -358,8 +358,7 @@ static ofdn_t ofd_node_create(
>      n->on_io = 0;
>      n->on_pathlen = pathlen;
>      n->on_last = ofd_pathsplit_left(path, '/', pathlen);
> -    strncpy(n->on_path, path, pathlen);
> -    n->on_path[n->on_pathlen] = 0;
> +    strlcpy(n->on_path, path, pathlen);
>  
>      return pos;
>  }
> diff -r bef7fbe25a9f -r d2784d93e760 xen/arch/powerpc/ofd_fixup.c
> --- a/xen/arch/powerpc/ofd_fixup.c    Mon Jan 29 14:59:42 2007 +0000
> +++ b/xen/arch/powerpc/ofd_fixup.c    Mon Jan 29 15:01:33 2007 +0000
> @@ -267,7 +267,7 @@ static ofdn_t ofd_chosen_props(void *m, 
>                       &path[1], sizeof (path) - 1);
>      }
>  
> -    strcpy(bootargs, cmdline);
> +    strlcpy(bootargs, cmdline, sizeof(bootargs));
>      bsz = strlen(bootargs) + 1;
>      rm = sizeof (bootargs) - bsz;
>  
> 
> _______________________________________________
> Xen-staging mailing list
> Xen-staging@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-staging
> 

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