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Add a new sysctl, kern.elf[32|64].can_exec_dyn. When set to 1, one can

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execute a ET_DYN binary (shared object).
This does not make much sense, but some linux scripts expect to be able to
execute /lib/ld-linux.so.2 (ldd comes to mind).
The sysctl defaults to 0.

MFC after:	3 days
This commit is contained in:
cognet 2005-11-14 22:24:00 +00:00
parent 4c46ed51b6
commit 48c06903ba
1 changed files with 7 additions and 1 deletions
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8
sys/kern/imgact_elf.c
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@ -97,6 +97,11 @@ SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
TUNABLE_INT("kern.elf" __XSTRING(__ELF_WORD_SIZE) ".fallback_brand",
&__elfN(fallback_brand));
int __elfN(can_exec_dyn) = 0;
SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
can_exec_dyn, CTLFLAG_RW, &__elfN(can_exec_dyn), 0,
__XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " can exec shared libraries");
static int elf_trace = 0;
SYSCTL_INT(_debug, OID_AUTO, __elfN(trace), CTLFLAG_RW, &elf_trace, 0, "");
@ -660,7 +665,8 @@ __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
/*
* Do we have a valid ELF header ?
*/
if (__elfN(check_header)(hdr) != 0 || hdr->e_type != ET_EXEC)
if (__elfN(check_header)(hdr) != 0 || (hdr->e_type != ET_EXEC
&& (!__elfN(can_exec_dyn) || hdr->e_type != ET_DYN)))
return (-1);
/*