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Add a flag BI_BRAND_ONLY_STATIC to specify that the brand only

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matches static binaries.

Interpretation of the 'static' there is that the binary must not
specify an interpreter.  In particular, shared objects are matched by
the brand if BI_CAN_EXEC_DYN is also set.

This improves precision of the brand matching, which should eliminate
surprises due to brand ordering.

Revert r315701.

Discussed with and tested by:	ed (previous version)
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2017-03-22 22:23:01 +00:00
parent 7aab7a80e2
commit 1438fe3cf2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=315753
7 changed files with 17 additions and 10 deletions
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2
sys/amd64/cloudabi32/cloudabi32_sysvec.c
View File

@ -228,5 +228,5 @@ Elf32_Brandinfo cloudabi32_brand = {
.machine = EM_386,
.sysvec = &cloudabi32_elf_sysvec,
.compat_3_brand = "CloudABI",
.interp_path = "/nonexistent",
.flags = BI_BRAND_NOTE_ONLY_STATIC,
};

3
sys/amd64/cloudabi64/cloudabi64_sysvec.c
View File

@ -212,7 +212,6 @@ Elf64_Brandinfo cloudabi64_brand = {
.brand = ELFOSABI_CLOUDABI,
.machine = EM_X86_64,
.sysvec = &cloudabi64_elf_sysvec,
.flags = BI_CAN_EXEC_DYN,
.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_ONLY_STATIC,
.compat_3_brand = "CloudABI",
.interp_path = "/nonexistent",
};

2
sys/arm/cloudabi32/cloudabi32_sysvec.c
View File

@ -190,5 +190,5 @@ Elf32_Brandinfo cloudabi32_brand = {
.machine = EM_ARM,
.sysvec = &cloudabi32_elf_sysvec,
.compat_3_brand = "CloudABI",
.interp_path = "/nonexistent",
.flags = BI_BRAND_NOTE_ONLY_STATIC,
};

3
sys/arm64/cloudabi64/cloudabi64_sysvec.c
View File

@ -181,7 +181,6 @@ Elf64_Brandinfo cloudabi64_brand = {
.brand = ELFOSABI_CLOUDABI,
.machine = EM_AARCH64,
.sysvec = &cloudabi64_elf_sysvec,
.flags = BI_CAN_EXEC_DYN,
.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_ONLY_STATIC,
.compat_3_brand = "CloudABI",
.interp_path = "/nonexistent",
};

2
sys/i386/cloudabi32/cloudabi32_sysvec.c
View File

@ -201,5 +201,5 @@ Elf32_Brandinfo cloudabi32_brand = {
.machine = EM_386,
.sysvec = &cloudabi32_elf_sysvec,
.compat_3_brand = "CloudABI",
.interp_path = "/nonexistent",
.flags = BI_BRAND_NOTE_ONLY_STATIC,
};

14
sys/kern/imgact_elf.c
View File

@ -273,6 +273,9 @@ __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
bi = elf_brand_list[i];
if (bi == NULL)
continue;
if (interp != NULL &&
(bi->flags & BI_BRAND_NOTE_ONLY_STATIC) != 0)
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);
@ -305,7 +308,9 @@ __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 || bi->flags & BI_BRAND_NOTE_MANDATORY)
if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 ||
(interp != NULL && (bi->flags &
BI_BRAND_NOTE_ONLY_STATIC) != 0))
continue;
if (hdr->e_machine == bi->machine &&
(hdr->e_ident[EI_OSABI] == bi->brand ||
@ -351,7 +356,8 @@ __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 || bi->flags & BI_BRAND_NOTE_MANDATORY)
if (bi == NULL || (bi->flags & (BI_BRAND_NOTE_MANDATORY |
BI_BRAND_NOTE_ONLY_STATIC)) != 0)
continue;
if (hdr->e_machine == bi->machine &&
/* ELF image p_filesz includes terminating zero */
@ -365,7 +371,9 @@ __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 || bi->flags & BI_BRAND_NOTE_MANDATORY)
if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 ||
(interp != NULL && (bi->flags &
BI_BRAND_NOTE_ONLY_STATIC) != 0))
continue;
if (hdr->e_machine == bi->machine &&
__elfN(fallback_brand) == bi->brand)

1
sys/sys/imgact_elf.h
View File

@ -81,6 +81,7 @@ typedef struct {
#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. */
#define BI_BRAND_NOTE_ONLY_STATIC 0x0008
} __ElfN(Brandinfo);
__ElfType(Auxargs);