The patch titled Subject: exec: pass stack rlimit into mm layout functions has been added to the -mm tree. Its filename is exec-pass-stack-rlimit-into-mm-layout-functions.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/exec-pass-stack-rlimit-into-mm-layout-functions.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/exec-pass-stack-rlimit-into-mm-layout-functions.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Kees Cook <keescook@xxxxxxxxxxxx> Subject: exec: pass stack rlimit into mm layout functions Patch series "exec: Pin stack limit during exec". Attempts to solve problems with the stack limit changing during exec continue to be frustrated[1][2]. In addition to the specific issues around the Stack Clash family of flaws, Andy Lutomirski pointed out[3] other places during exec where the stack limit is used and is assumed to be unchanging. Given the many places it gets used and the fact that it can be manipulated/raced via setrlimit() and prlimit(), I think the only way to handle this is to move away from the "current" view of the stack limit and instead attach it to the bprm, and plumb this down into the functions that need to know the stack limits. This series implements the approach. [1] 04e35f4495dd ("exec: avoid RLIMIT_STACK races with prlimit()") [2] 779f4e1c6c7c ("Revert "exec: avoid RLIMIT_STACK races with prlimit()"") [3] to security@xxxxxxxxxx, "Subject: existing rlimit races?" This patch (of 3): 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. Link: http://lkml.kernel.org/r/1518638796-20819-2-git-send-email-keescook@xxxxxxxxxxxx Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxxxx> Cc: Ben Hutchings <ben@xxxxxxxxxxxxxxx> Cc: Willy Tarreau <w@xxxxxx> Cc: Hugh Dickins <hughd@xxxxxxxxxx> Cc: Oleg Nesterov <oleg@xxxxxxxxxx> Cc: "Jason A. Donenfeld" <Jason@xxxxxxxxx> Cc: Rik van Riel <riel@xxxxxxxxxx> Cc: Laura Abbott <labbott@xxxxxxxxxx> Cc: Greg KH <greg@xxxxxxxxx> Cc: Andy Lutomirski <luto@xxxxxxxxxx> Cc: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx> Cc: Brad Spengler <spender@xxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- 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 -puN arch/arm64/mm/mmap.c~exec-pass-stack-rlimit-into-mm-layout-functions arch/arm64/mm/mmap.c --- a/arch/arm64/mm/mmap.c~exec-pass-stack-rlimit-into-mm-layout-functions +++ a/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 * 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_str * 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 -puN arch/arm/mm/mmap.c~exec-pass-stack-rlimit-into-mm-layout-functions arch/arm/mm/mmap.c --- a/arch/arm/mm/mmap.c~exec-pass-stack-rlimit-into-mm-layout-functions +++ a/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 -puN arch/mips/mm/mmap.c~exec-pass-stack-rlimit-into-mm-layout-functions arch/mips/mm/mmap.c --- a/arch/mips/mm/mmap.c~exec-pass-stack-rlimit-into-mm-layout-functions +++ a/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 -puN arch/parisc/kernel/sys_parisc.c~exec-pass-stack-rlimit-into-mm-layout-functions arch/parisc/kernel/sys_parisc.c --- a/arch/parisc/kernel/sys_parisc.c~exec-pass-stack-rlimit-into-mm-layout-functions +++ a/arch/parisc/kernel/sys_parisc.c @@ -70,12 +70,18 @@ static inline unsigned long COLOR_ALIGN( * 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(str 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(vo * 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 -puN arch/powerpc/mm/mmap.c~exec-pass-stack-rlimit-into-mm-layout-functions arch/powerpc/mm/mmap.c --- a/arch/powerpc/mm/mmap.c~exec-pass-stack-rlimit-into-mm-layout-functions +++ a/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_maxran 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(st } 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_str 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 -puN arch/s390/mm/mmap.c~exec-pass-stack-rlimit-into-mm-layout-functions arch/s390/mm/mmap.c --- a/arch/s390/mm/mmap.c~exec-pass-stack-rlimit-into-mm-layout-functions +++ a/arch/s390/mm/mmap.c @@ -37,11 +37,11 @@ static unsigned long stack_maxrandom_siz #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(un 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 @@ check_asce_limit: * 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_str * 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 -puN arch/sparc/kernel/sys_sparc_64.c~exec-pass-stack-rlimit-into-mm-layout-functions arch/sparc/kernel/sys_sparc_64.c --- a/arch/sparc/kernel/sys_sparc_64.c~exec-pass-stack-rlimit-into-mm-layout-functions +++ a/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_str * 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 -puN arch/tile/mm/mmap.c~exec-pass-stack-rlimit-into-mm-layout-functions arch/tile/mm/mmap.c --- a/arch/tile/mm/mmap.c~exec-pass-stack-rlimit-into-mm-layout-functions +++ a/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(st * 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_str * 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 -puN arch/x86/mm/mmap.c~exec-pass-stack-rlimit-into-mm-layout-functions arch/x86/mm/mmap.c --- a/arch/x86/mm/mmap.c~exec-pass-stack-rlimit-into-mm-layout-functions +++ a/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(un * 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_str 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_str * 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 -puN fs/exec.c~exec-pass-stack-rlimit-into-mm-layout-functions fs/exec.c --- a/fs/exec.c~exec-pass-stack-rlimit-into-mm-layout-functions +++ a/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 @@ -1346,7 +1348,11 @@ void setup_new_exec(struct linux_binprm 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 -puN include/linux/sched/mm.h~exec-pass-stack-rlimit-into-mm-layout-functions include/linux/sched/mm.h --- a/include/linux/sched/mm.h~exec-pass-stack-rlimit-into-mm-layout-functions +++ a/include/linux/sched/mm.h @@ -104,7 +104,8 @@ static inline void mm_update_next_owner( #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); @@ -113,7 +114,8 @@ arch_get_unmapped_area_topdown(struct fi 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 -puN mm/util.c~exec-pass-stack-rlimit-into-mm-layout-functions mm/util.c --- a/mm/util.c~exec-pass-stack-rlimit-into-mm-layout-functions +++ a/mm/util.c @@ -287,7 +287,7 @@ int vma_is_stack_for_current(struct vm_a } #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; _ Patches currently in -mm which might be from keescook@xxxxxxxxxxxx are exec-pass-stack-rlimit-into-mm-layout-functions.patch exec-introduce-finalize_exec-before-start_thread.patch exec-pin-stack-limit-during-exec.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html