Author: delphij
Date: Wed Jan 27 07:34:23 2016
New Revision: 294903
URL: https://svnweb.freebsd.org/changeset/base/294903
Log:
MFC r294900:
Implement AT_SECURE properly.
AT_SECURE auxv entry has been added to the Linux 2.5 kernel to pass a
boolean flag indicating whether secure mode should be enabled. 1 means
that the program has changes its credentials during the execution.
Being exported AT_SECURE used by glibc issetugid() call.
Submitted by: imp, dchagin
Security: FreeBSD-SA-16:10.linux
Security: CVE-2016-1883
Modified:
stable/9/sys/amd64/linux32/linux32_sysvec.c
stable/9/sys/i386/linux/linux_sysvec.c
Directory Properties:
stable/9/sys/ (props changed)
stable/9/sys/amd64/include/xen/ (props changed)
stable/9/sys/boot/ (props changed)
stable/9/sys/boot/forth/ (props changed)
stable/9/sys/boot/i386/efi/ (props changed)
stable/9/sys/boot/i386/gptboot/ (props changed)
stable/9/sys/boot/ia64/efi/ (props changed)
stable/9/sys/boot/ia64/ski/ (props changed)
stable/9/sys/boot/powerpc/boot1.chrp/ (props changed)
stable/9/sys/boot/powerpc/ofw/ (props changed)
stable/9/sys/cddl/contrib/opensolaris/ (props changed)
stable/9/sys/conf/ (props changed)
stable/9/sys/contrib/dev/acpica/ (props changed)
stable/9/sys/contrib/dev/run/ (props changed)
stable/9/sys/contrib/octeon-sdk/ (props changed)
stable/9/sys/contrib/pf/ (props changed)
stable/9/sys/contrib/x86emu/ (props changed)
stable/9/sys/dev/ (props changed)
stable/9/sys/dev/e1000/ (props changed)
stable/9/sys/dev/isp/ (props changed)
stable/9/sys/dev/ixgbe/ (props changed)
stable/9/sys/dev/puc/ (props changed)
stable/9/sys/dev/usb/wlan/if_run.c (props changed)
stable/9/sys/dev/usb/wlan/if_runreg.h (props changed)
stable/9/sys/fs/ (props changed)
stable/9/sys/fs/ntfs/ (props changed)
stable/9/sys/modules/ (props changed)
stable/9/sys/modules/ixgbe/ (props changed)
stable/9/sys/modules/svr4/ (props changed)
stable/9/sys/net/ (props changed)
stable/9/sys/netpfil/ (props changed)
stable/9/sys/sys/ (props changed)
Modified: stable/9/sys/amd64/linux32/linux32_sysvec.c
==============================================================================
--- stable/9/sys/amd64/linux32/linux32_sysvec.c Wed Jan 27 07:34:00 2016
(r294902)
+++ stable/9/sys/amd64/linux32/linux32_sysvec.c Wed Jan 27 07:34:23 2016
(r294903)
@@ -247,6 +247,7 @@ elf_linux_fixup(register_t **stack_base,
Elf32_Addr *base;
Elf32_Addr *pos, *uplatform;
struct linux32_ps_strings *arginfo;
+ int issetugid;
arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS;
uplatform = (Elf32_Addr *)((caddr_t)arginfo - linux_szplatform);
@@ -257,6 +258,7 @@ elf_linux_fixup(register_t **stack_base,
args = (Elf32_Auxargs *)imgp->auxargs;
pos = base + (imgp->args->argc + imgp->args->envc + 2);
+ issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0;
AUXARGS_ENTRY_32(pos, LINUX_AT_HWCAP, cpu_feature);
/*
@@ -276,7 +278,7 @@ elf_linux_fixup(register_t **stack_base,
AUXARGS_ENTRY_32(pos, AT_FLAGS, args->flags);
AUXARGS_ENTRY_32(pos, AT_ENTRY, args->entry);
AUXARGS_ENTRY_32(pos, AT_BASE, args->base);
- AUXARGS_ENTRY_32(pos, LINUX_AT_SECURE, 0);
+ AUXARGS_ENTRY_32(pos, LINUX_AT_SECURE, issetugid);
AUXARGS_ENTRY_32(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
AUXARGS_ENTRY_32(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
AUXARGS_ENTRY_32(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
Modified: stable/9/sys/i386/linux/linux_sysvec.c
==============================================================================
--- stable/9/sys/i386/linux/linux_sysvec.c Wed Jan 27 07:34:00 2016
(r294902)
+++ stable/9/sys/i386/linux/linux_sysvec.c Wed Jan 27 07:34:23 2016
(r294903)
@@ -243,11 +243,13 @@ elf_linux_fixup(register_t **stack_base,
Elf32_Addr *uplatform;
struct ps_strings *arginfo;
register_t *pos;
+ int issetugid;
KASSERT(curthread->td_proc == imgp->proc,
("unsafe elf_linux_fixup(), should be curproc"));
p = imgp->proc;
+ issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0;
arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
uplatform = (Elf32_Addr *)((caddr_t)arginfo - linux_szplatform);
args = (Elf32_Auxargs *)imgp->auxargs;
@@ -272,7 +274,7 @@ elf_linux_fixup(register_t **stack_base,
AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
AUXARGS_ENTRY(pos, AT_BASE, args->base);
- AUXARGS_ENTRY(pos, LINUX_AT_SECURE, 0);
+ AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
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