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Make sure FreeBSD binaries without .note.ABI-tag section work

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correctly and do not match a colliding Debian GNU/kFreeBSD
brandinfo statements.
For this mark the Debian GNU/kFreeBSD brandinfo that it must have
an .note.ABI-tag section and ignore the old EI_OSABI brandinfo
when comparing a possibly colliding set of options.

Due to SYSINIT we add the brandinfo in a non-deterministic order,
so native FreeBSD is not always first. We may want to consider
to force native FreeBSD to come first as well.

The only way a problem could currently be noticed is when running an
i386 binary without the .note.ABI-tag on amd64 and the Debian GNU/kFreeBSD
brandinfo  was matched first,  as the fallback to ld-elf32.so.1 does
not exist in that case.

Reported and tested by:	ticso
In collaboration with:	kib
MFC after:		3 days
This commit is contained in:
Bjoern A. Zeeb 2009-08-30 14:38:17 +00:00
parent 34903a55c3
commit ecc2fda872
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=196653
5 changed files with 19 additions and 10 deletions
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2
sys/amd64/amd64/elf_machdep.c
View File

@ -118,7 +118,7 @@ static Elf64_Brandinfo kfreebsd_brand_info = {
.sysvec = &elf64_freebsd_sysvec,
.interp_newpath = NULL,
.brand_note = &elf64_kfreebsd_brandnote,
.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
};
SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY,

2
sys/compat/ia32/ia32_sysvec.c
View File

@ -180,7 +180,7 @@ static Elf32_Brandinfo kia32_brand_info = {
.interp_path = "/lib/ld.so.1",
.sysvec = &ia32_freebsd_sysvec,
.brand_note = &elf32_kfreebsd_brandnote,
.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
};
SYSINIT(kia32, SI_SUB_EXEC, SI_ORDER_ANY,

2
sys/i386/i386/elf_machdep.c
View File

@ -117,7 +117,7 @@ static Elf32_Brandinfo kfreebsd_brand_info = {
.sysvec = &elf32_freebsd_sysvec,
.interp_newpath = NULL,
.brand_note = &elf32_kfreebsd_brandnote,
.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
};
SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY,

18
sys/kern/imgact_elf.c
View File

@ -238,8 +238,10 @@ __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
/* Look for an ".note.ABI-tag" ELF section */
for (i = 0; i < MAX_BRANDS; i++) {
bi = elf_brand_list[i];
if (bi != NULL && hdr->e_machine == bi->machine &&
(bi->flags & BI_BRAND_NOTE) != 0) {
if (bi == NULL)
continue;
if (hdr->e_machine == bi->machine && (bi->flags &
(BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) {
ret = __elfN(check_note)(imgp, bi->brand_note, osrel);
if (ret)
return (bi);
@ -249,7 +251,9 @@ __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
/* If the executable has a brand, search for it in the brand list. */
for (i = 0; i < MAX_BRANDS; i++) {
bi = elf_brand_list[i];
if (bi != NULL && hdr->e_machine == bi->machine &&
if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
continue;
if (hdr->e_machine == bi->machine &&
(hdr->e_ident[EI_OSABI] == bi->brand ||
strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0))
@ -260,7 +264,9 @@ __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
if (interp != NULL) {
for (i = 0; i < MAX_BRANDS; i++) {
bi = elf_brand_list[i];
if (bi != NULL && hdr->e_machine == bi->machine &&
if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
continue;
if (hdr->e_machine == bi->machine &&
strcmp(interp, bi->interp_path) == 0)
return (bi);
}
@ -269,7 +275,9 @@ __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
/* Lacking a recognized interpreter, try the default brand */
for (i = 0; i < MAX_BRANDS; i++) {
bi = elf_brand_list[i];
if (bi != NULL && hdr->e_machine == bi->machine &&
if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
continue;
if (hdr->e_machine == bi->machine &&
__elfN(fallback_brand) == bi->brand)
return (bi);
}

5
sys/sys/imgact_elf.h
View File

@ -74,8 +74,9 @@ typedef struct {
const char *interp_newpath;
int flags;
Elf_Brandnote *brand_note;
#define BI_CAN_EXEC_DYN 0x0001
#define BI_BRAND_NOTE 0x0002
#define BI_CAN_EXEC_DYN 0x0001
#define BI_BRAND_NOTE 0x0002 /* May have note.ABI-tag section. */
#define BI_BRAND_NOTE_MANDATORY 0x0004 /* Must have note.ABI-tag section. */
} __ElfN(Brandinfo);
__ElfType(Auxargs);