[PATCH 1/3] exec: Pass stack rlimit into mm layout functions

From: Kees Cook
Date: Tue Jan 09 2018 - 15:23:49 EST

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Since it is possible that the stack rlimit can change externally during
exec (either via another thread calling setrlimit() or another process
calling prlimit()), provide a way to pass the rlimit down into the
per-architecture mm layout functions so that the rlimit can stay in the
bprm structure instead of sitting in the signal structure until exec is
finalized.

Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
arch/arm/mm/mmap.c | 14 +++++++-------
arch/arm64/mm/mmap.c | 14 +++++++-------
arch/mips/mm/mmap.c | 14 +++++++-------
arch/parisc/kernel/sys_parisc.c | 16 +++++++++++-----
arch/powerpc/mm/mmap.c | 28 ++++++++++++++++------------
arch/s390/mm/mmap.c | 15 ++++++++-------
arch/sparc/kernel/sys_sparc_64.c | 4 ++--
arch/tile/mm/mmap.c | 11 ++++++-----
arch/x86/mm/mmap.c | 18 +++++++++++-------
fs/exec.c | 8 +++++++-
include/linux/sched/mm.h | 6 ++++--
mm/util.c | 2 +-
12 files changed, 87 insertions(+), 63 deletions(-)

diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c
index eb1de66517d5..f866870db749 100644
--- a/arch/arm/mm/mmap.c
+++ b/arch/arm/mm/mmap.c
@@ -21,20 +21,20 @@
#define MIN_GAP (128*1024*1024UL)
#define MAX_GAP ((TASK_SIZE)/6*5)

-static int mmap_is_legacy(void)
+static int mmap_is_legacy(struct rlimit *rlim_stack)
{
if (current->personality & ADDR_COMPAT_LAYOUT)
return 1;

- if (rlimit(RLIMIT_STACK) == RLIM_INFINITY)
+ if (rlim_stack->rlim_cur == RLIM_INFINITY)
return 1;

return sysctl_legacy_va_layout;
}

-static unsigned long mmap_base(unsigned long rnd)
+static unsigned long mmap_base(unsigned long rnd, struct rlimit *rlim_stack)
{
- unsigned long gap = rlimit(RLIMIT_STACK);
+ unsigned long gap = rlim_stack->rlim_cur;

if (gap < MIN_GAP)
gap = MIN_GAP;
@@ -180,18 +180,18 @@ unsigned long arch_mmap_rnd(void)
return rnd << PAGE_SHIFT;
}

-void arch_pick_mmap_layout(struct mm_struct *mm)
+void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
{
unsigned long random_factor = 0UL;

if (current->flags & PF_RANDOMIZE)
random_factor = arch_mmap_rnd();

- if (mmap_is_legacy()) {
+ if (mmap_is_legacy(rlim_stack)) {
mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
mm->get_unmapped_area = arch_get_unmapped_area;
} else {
- mm->mmap_base = mmap_base(random_factor);
+ mm->mmap_base = mmap_base(random_factor, rlim_stack);
mm->get_unmapped_area = arch_get_unmapped_area_topdown;
}
}
diff --git a/arch/arm64/mm/mmap.c b/arch/arm64/mm/mmap.c
index decccffb03ca..842c8a5fcd53 100644
--- a/arch/arm64/mm/mmap.c
+++ b/arch/arm64/mm/mmap.c
@@ -38,12 +38,12 @@
#define MIN_GAP (SZ_128M)
#define MAX_GAP (STACK_TOP/6*5)

-static int mmap_is_legacy(void)
+static int mmap_is_legacy(struct rlimit *rlim_stack)
{
if (current->personality & ADDR_COMPAT_LAYOUT)
return 1;

- if (rlimit(RLIMIT_STACK) == RLIM_INFINITY)
+ if (rlim_stack->rlim_cur == RLIM_INFINITY)
return 1;

return sysctl_legacy_va_layout;
@@ -62,9 +62,9 @@ unsigned long arch_mmap_rnd(void)
return rnd << PAGE_SHIFT;
}

-static unsigned long mmap_base(unsigned long rnd)
+static unsigned long mmap_base(unsigned long rnd, struct rlimit *rlim_stack)
{
- unsigned long gap = rlimit(RLIMIT_STACK);
+ unsigned long gap = rlim_stack->rlim_cur;
unsigned long pad = (STACK_RND_MASK << PAGE_SHIFT) + stack_guard_gap;

/* Values close to RLIM_INFINITY can overflow. */
@@ -83,7 +83,7 @@ static unsigned long mmap_base(unsigned long rnd)
* This function, called very early during the creation of a new process VM
* image, sets up which VM layout function to use:
*/
-void arch_pick_mmap_layout(struct mm_struct *mm)
+void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
{
unsigned long random_factor = 0UL;

@@ -94,11 +94,11 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
* Fall back to the standard layout if the personality bit is set, or
* if the expected stack growth is unlimited:
*/
- if (mmap_is_legacy()) {
+ if (mmap_is_legacy(rlim_stack)) {
mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
mm->get_unmapped_area = arch_get_unmapped_area;
} else {
- mm->mmap_base = mmap_base(random_factor);
+ mm->mmap_base = mmap_base(random_factor, rlim_stack);
mm->get_unmapped_area = arch_get_unmapped_area_topdown;
}
}
diff --git a/arch/mips/mm/mmap.c b/arch/mips/mm/mmap.c
index 33d3251ecd37..2f616ebeb7e0 100644
--- a/arch/mips/mm/mmap.c
+++ b/arch/mips/mm/mmap.c
@@ -24,20 +24,20 @@ EXPORT_SYMBOL(shm_align_mask);
#define MIN_GAP (128*1024*1024UL)
#define MAX_GAP ((TASK_SIZE)/6*5)

-static int mmap_is_legacy(void)
+static int mmap_is_legacy(struct rlimit *rlim_stack)
{
if (current->personality & ADDR_COMPAT_LAYOUT)
return 1;

- if (rlimit(RLIMIT_STACK) == RLIM_INFINITY)
+ if (rlim_stack->rlim_cur == RLIM_INFINITY)
return 1;

return sysctl_legacy_va_layout;
}

-static unsigned long mmap_base(unsigned long rnd)
+static unsigned long mmap_base(unsigned long rnd, struct rlimit *rlim_stack)
{
- unsigned long gap = rlimit(RLIMIT_STACK);
+ unsigned long gap = rlim_stack->rlim_cur;

if (gap < MIN_GAP)
gap = MIN_GAP;
@@ -158,18 +158,18 @@ unsigned long arch_mmap_rnd(void)
return rnd << PAGE_SHIFT;
}

-void arch_pick_mmap_layout(struct mm_struct *mm)
+void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
{
unsigned long random_factor = 0UL;

if (current->flags & PF_RANDOMIZE)
random_factor = arch_mmap_rnd();

- if (mmap_is_legacy()) {
+ if (mmap_is_legacy(rlim_stack)) {
mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
mm->get_unmapped_area = arch_get_unmapped_area;
} else {
- mm->mmap_base = mmap_base(random_factor);
+ mm->mmap_base = mmap_base(random_factor, rlim_stack);
mm->get_unmapped_area = arch_get_unmapped_area_topdown;
}
}
diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
index 378a754ca186..ff9289626d42 100644
--- a/arch/parisc/kernel/sys_parisc.c
+++ b/arch/parisc/kernel/sys_parisc.c
@@ -70,12 +70,18 @@ static inline unsigned long COLOR_ALIGN(unsigned long addr,
* Top of mmap area (just below the process stack).
*/

-static unsigned long mmap_upper_limit(void)
+/*
+ * When called from arch_get_unmapped_area(), rlim_stack will be NULL,
+ * indicating that "current" should be used instead of a passed-in
+ * value from the exec bprm as done with arch_pick_mmap_layout().
+ */
+static unsigned long mmap_upper_limit(struct rlimit *rlim_stack)
{
unsigned long stack_base;

/* Limit stack size - see setup_arg_pages() in fs/exec.c */
- stack_base = rlimit_max(RLIMIT_STACK);
+ stack_base = rlim_stack ? rlim_stack->rlim_max
+ : rlimit_max(RLIMIT_STACK);
if (stack_base > STACK_SIZE_MAX)
stack_base = STACK_SIZE_MAX;

@@ -127,7 +133,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
info.flags = 0;
info.length = len;
info.low_limit = mm->mmap_legacy_base;
- info.high_limit = mmap_upper_limit();
+ info.high_limit = mmap_upper_limit(NULL);
info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
info.align_offset = shared_align_offset(last_mmap, pgoff);
addr = vm_unmapped_area(&info);
@@ -250,10 +256,10 @@ static unsigned long mmap_legacy_base(void)
* This function, called very early during the creation of a new
* process VM image, sets up which VM layout function to use:
*/
-void arch_pick_mmap_layout(struct mm_struct *mm)
+void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
{
mm->mmap_legacy_base = mmap_legacy_base();
- mm->mmap_base = mmap_upper_limit();
+ mm->mmap_base = mmap_upper_limit(rlim_stack);

if (mmap_is_legacy()) {
mm->mmap_base = mm->mmap_legacy_base;
diff --git a/arch/powerpc/mm/mmap.c b/arch/powerpc/mm/mmap.c
index d503f344e476..b24ce40acd47 100644
--- a/arch/powerpc/mm/mmap.c
+++ b/arch/powerpc/mm/mmap.c
@@ -39,12 +39,12 @@
#define MIN_GAP (128*1024*1024)
#define MAX_GAP (TASK_SIZE/6*5)

-static inline int mmap_is_legacy(void)
+static inline int mmap_is_legacy(struct rlimit *rlim_stack)
{
if (current->personality & ADDR_COMPAT_LAYOUT)
return 1;

- if (rlimit(RLIMIT_STACK) == RLIM_INFINITY)
+ if (rlim_stack->rlim_cur == RLIM_INFINITY)
return 1;

return sysctl_legacy_va_layout;
@@ -76,9 +76,10 @@ static inline unsigned long stack_maxrandom_size(void)
return (1<<30);
}

-static inline unsigned long mmap_base(unsigned long rnd)
+static inline unsigned long mmap_base(unsigned long rnd,
+ struct rlimit *rlim_stack)
{
- unsigned long gap = rlimit(RLIMIT_STACK);
+ unsigned long gap = rlim_stack->rlim_cur;
unsigned long pad = stack_maxrandom_size() + stack_guard_gap;

/* Values close to RLIM_INFINITY can overflow. */
@@ -196,26 +197,28 @@ radix__arch_get_unmapped_area_topdown(struct file *filp,
}

static void radix__arch_pick_mmap_layout(struct mm_struct *mm,
- unsigned long random_factor)
+ unsigned long random_factor,
+ struct rlimit *rlim_stack)
{
- if (mmap_is_legacy()) {
+ if (mmap_is_legacy(rlim_stack)) {
mm->mmap_base = TASK_UNMAPPED_BASE;
mm->get_unmapped_area = radix__arch_get_unmapped_area;
} else {
- mm->mmap_base = mmap_base(random_factor);
+ mm->mmap_base = mmap_base(random_factor, rlim_stack);
mm->get_unmapped_area = radix__arch_get_unmapped_area_topdown;
}
}
#else
/* dummy */
extern void radix__arch_pick_mmap_layout(struct mm_struct *mm,
- unsigned long random_factor);
+ unsigned long random_factor,
+ struct rlimit *rlim_stack);
#endif
/*
* This function, called very early during the creation of a new
* process VM image, sets up which VM layout function to use:
*/
-void arch_pick_mmap_layout(struct mm_struct *mm)
+void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
{
unsigned long random_factor = 0UL;

@@ -223,16 +226,17 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
random_factor = arch_mmap_rnd();

if (radix_enabled())
- return radix__arch_pick_mmap_layout(mm, random_factor);
+ return radix__arch_pick_mmap_layout(mm, random_factor,
+ rlim_stack);
/*
* Fall back to the standard layout if the personality
* bit is set, or if the expected stack growth is unlimited:
*/
- if (mmap_is_legacy()) {
+ if (mmap_is_legacy(rlim_stack)) {
mm->mmap_base = TASK_UNMAPPED_BASE;
mm->get_unmapped_area = arch_get_unmapped_area;
} else {
- mm->mmap_base = mmap_base(random_factor);
+ mm->mmap_base = mmap_base(random_factor, rlim_stack);
mm->get_unmapped_area = arch_get_unmapped_area_topdown;
}
}
diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
index 831bdcf407bb..0a7627cdb34e 100644
--- a/arch/s390/mm/mmap.c
+++ b/arch/s390/mm/mmap.c
@@ -37,11 +37,11 @@ static unsigned long stack_maxrandom_size(void)
#define MIN_GAP (32*1024*1024)
#define MAX_GAP (STACK_TOP/6*5)

-static inline int mmap_is_legacy(void)
+static inline int mmap_is_legacy(struct rlimit *rlim_stack)
{
if (current->personality & ADDR_COMPAT_LAYOUT)
return 1;
- if (rlimit(RLIMIT_STACK) == RLIM_INFINITY)
+ if (rlim_stack->rlim_cur == RLIM_INFINITY)
return 1;
return sysctl_legacy_va_layout;
}
@@ -56,9 +56,10 @@ static unsigned long mmap_base_legacy(unsigned long rnd)
return TASK_UNMAPPED_BASE + rnd;
}

-static inline unsigned long mmap_base(unsigned long rnd)
+static inline unsigned long mmap_base(unsigned long rnd,
+ struct rlimit *rlim_stack)
{
- unsigned long gap = rlimit(RLIMIT_STACK);
+ unsigned long gap = rlim_stack->rlim_cur;

if (gap < MIN_GAP)
gap = MIN_GAP;
@@ -184,7 +185,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
* This function, called very early during the creation of a new
* process VM image, sets up which VM layout function to use:
*/
-void arch_pick_mmap_layout(struct mm_struct *mm)
+void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
{
unsigned long random_factor = 0UL;

@@ -195,11 +196,11 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
* Fall back to the standard layout if the personality
* bit is set, or if the expected stack growth is unlimited:
*/
- if (mmap_is_legacy()) {
+ if (mmap_is_legacy(rlim_stack)) {
mm->mmap_base = mmap_base_legacy(random_factor);
mm->get_unmapped_area = arch_get_unmapped_area;
} else {
- mm->mmap_base = mmap_base(random_factor);
+ mm->mmap_base = mmap_base(random_factor, rlim_stack);
mm->get_unmapped_area = arch_get_unmapped_area_topdown;
}
}
diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c
index 55416db482ad..2f896fecd01f 100644
--- a/arch/sparc/kernel/sys_sparc_64.c
+++ b/arch/sparc/kernel/sys_sparc_64.c
@@ -276,7 +276,7 @@ static unsigned long mmap_rnd(void)
return rnd << PAGE_SHIFT;
}

-void arch_pick_mmap_layout(struct mm_struct *mm)
+void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
{
unsigned long random_factor = mmap_rnd();
unsigned long gap;
@@ -285,7 +285,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
* Fall back to the standard layout if the personality
* bit is set, or if the expected stack growth is unlimited:
*/
- gap = rlimit(RLIMIT_STACK);
+ gap = rlim_stack->rlim_cur;
if (!test_thread_flag(TIF_32BIT) ||
(current->personality & ADDR_COMPAT_LAYOUT) ||
gap == RLIM_INFINITY ||
diff --git a/arch/tile/mm/mmap.c b/arch/tile/mm/mmap.c
index 8ab28167c44b..26366d694e0e 100644
--- a/arch/tile/mm/mmap.c
+++ b/arch/tile/mm/mmap.c
@@ -30,9 +30,10 @@
#define MIN_GAP (128*1024*1024)
#define MAX_GAP (TASK_SIZE/6*5)

-static inline unsigned long mmap_base(struct mm_struct *mm)
+static inline unsigned long mmap_base(struct mm_struct *mm,
+ struct rlimit *rlim_stack)
{
- unsigned long gap = rlimit(RLIMIT_STACK);
+ unsigned long gap = rlim_stack->rlim_cur;
unsigned long random_factor = 0;

if (current->flags & PF_RANDOMIZE)
@@ -50,7 +51,7 @@ static inline unsigned long mmap_base(struct mm_struct *mm)
* This function, called very early during the creation of a new
* process VM image, sets up which VM layout function to use:
*/
-void arch_pick_mmap_layout(struct mm_struct *mm)
+void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
{
#if !defined(__tilegx__)
int is_32bit = 1;
@@ -78,11 +79,11 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
* Use standard layout if the expected stack growth is unlimited
* or we are running native 64 bits.
*/
- if (rlimit(RLIMIT_STACK) == RLIM_INFINITY) {
+ if (rlim_stack->rlim_cur == RLIM_INFINITY) {
mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
mm->get_unmapped_area = arch_get_unmapped_area;
} else {
- mm->mmap_base = mmap_base(mm);
+ mm->mmap_base = mmap_base(mm, rlim_stack);
mm->get_unmapped_area = arch_get_unmapped_area_topdown;
}
}
diff --git a/arch/x86/mm/mmap.c b/arch/x86/mm/mmap.c
index 155ecbac9e28..48c591251600 100644
--- a/arch/x86/mm/mmap.c
+++ b/arch/x86/mm/mmap.c
@@ -90,9 +90,10 @@ unsigned long arch_mmap_rnd(void)
return arch_rnd(mmap_is_ia32() ? mmap32_rnd_bits : mmap64_rnd_bits);
}

-static unsigned long mmap_base(unsigned long rnd, unsigned long task_size)
+static unsigned long mmap_base(unsigned long rnd, unsigned long task_size,
+ struct rlimit *rlim_stack)
{
- unsigned long gap = rlimit(RLIMIT_STACK);
+ unsigned long gap = rlim_stack->rlim_cur;
unsigned long pad = stack_maxrandom_size(task_size) + stack_guard_gap;
unsigned long gap_min, gap_max;

@@ -126,16 +127,17 @@ static unsigned long mmap_legacy_base(unsigned long rnd,
* process VM image, sets up which VM layout function to use:
*/
static void arch_pick_mmap_base(unsigned long *base, unsigned long *legacy_base,
- unsigned long random_factor, unsigned long task_size)
+ unsigned long random_factor, unsigned long task_size,
+ struct rlimit *rlim_stack)
{
*legacy_base = mmap_legacy_base(random_factor, task_size);
if (mmap_is_legacy())
*base = *legacy_base;
else
- *base = mmap_base(random_factor, task_size);
+ *base = mmap_base(random_factor, task_size, rlim_stack);
}

-void arch_pick_mmap_layout(struct mm_struct *mm)
+void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
{
if (mmap_is_legacy())
mm->get_unmapped_area = arch_get_unmapped_area;
@@ -143,7 +145,8 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
mm->get_unmapped_area = arch_get_unmapped_area_topdown;

arch_pick_mmap_base(&mm->mmap_base, &mm->mmap_legacy_base,
- arch_rnd(mmap64_rnd_bits), task_size_64bit(0));
+ arch_rnd(mmap64_rnd_bits), task_size_64bit(0),
+ rlim_stack);

#ifdef CONFIG_HAVE_ARCH_COMPAT_MMAP_BASES
/*
@@ -153,7 +156,8 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
* mmap_base, the compat syscall uses mmap_compat_base.
*/
arch_pick_mmap_base(&mm->mmap_compat_base, &mm->mmap_compat_legacy_base,
- arch_rnd(mmap32_rnd_bits), task_size_32bit());
+ arch_rnd(mmap32_rnd_bits), task_size_32bit(),
+ rlim_stack);
#endif
}

diff --git a/fs/exec.c b/fs/exec.c
index 7eb8d21bcab9..7074913ad2e7 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1323,6 +1323,8 @@ EXPORT_SYMBOL(would_dump);

void setup_new_exec(struct linux_binprm * bprm)
{
+ struct rlimit rlim_stack;
+
/*
* Once here, prepare_binrpm() will not be called any more, so
* the final state of setuid/setgid/fscaps can be merged into the
@@ -1345,7 +1347,11 @@ void setup_new_exec(struct linux_binprm * bprm)
current->signal->rlim[RLIMIT_STACK].rlim_cur = _STK_LIM;
}

- arch_pick_mmap_layout(current->mm);
+ task_lock(current->group_leader);
+ rlim_stack = current->signal->rlim[RLIMIT_STACK];
+ task_unlock(current->group_leader);
+
+ arch_pick_mmap_layout(current->mm, &rlim_stack);

current->sas_ss_sp = current->sas_ss_size = 0;

diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h
index 3d49b91b674d..f28240e2c7e5 100644
--- a/include/linux/sched/mm.h
+++ b/include/linux/sched/mm.h
@@ -112,7 +112,8 @@ static inline void mm_update_next_owner(struct mm_struct *mm)
#endif /* CONFIG_MEMCG */

#ifdef CONFIG_MMU
-extern void arch_pick_mmap_layout(struct mm_struct *mm);
+extern void arch_pick_mmap_layout(struct mm_struct *mm,
+ struct rlimit *rlim_stack);
extern unsigned long
arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
unsigned long, unsigned long);
@@ -121,7 +122,8 @@ arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff,
unsigned long flags);
#else
-static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
+static inline void arch_pick_mmap_layout(struct mm_struct *mm,
+ struct rlimit *rlim_stack) {}
#endif

static inline bool in_vfork(struct task_struct *tsk)
diff --git a/mm/util.c b/mm/util.c
index 34e57fae959d..07b53a3c24c8 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -265,7 +265,7 @@ int vma_is_stack_for_current(struct vm_area_struct *vma)
}

#if defined(CONFIG_MMU) && !defined(HAVE_ARCH_PICK_MMAP_LAYOUT)
-void arch_pick_mmap_layout(struct mm_struct *mm)
+void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
{
mm->mmap_base = TASK_UNMAPPED_BASE;
mm->get_unmapped_area = arch_get_unmapped_area;
--
2.7.4

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