[PATCH] Restrict stack space reservation to rlimit
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From: Michael Neuling on 7 Feb 2010 19:10 apkm, linus: this or something like it needs to go into 2.6.33 (& 32) to fix 'ulimit -s'. Mikey [PATCH] Restrict stack space reservation to rlimit When reserving stack space for a new process, make sure we're not attempting to allocate more than rlimit allows. Also, reserve the same stack size independent of page size. This fixes a bug unmasked by fc63cf237078c86214abcb2ee9926d8ad289da9b Signed-off-by: Michael Neuling <mikey(a)neuling.org> Cc: Anton Blanchard <anton(a)samba.org> Cc: stable(a)kernel.org --- fs/exec.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) Index: clone1/fs/exec.c =================================================================== --- clone1.orig/fs/exec.c +++ clone1/fs/exec.c @@ -554,7 +554,7 @@ static int shift_arg_pages(struct vm_are return 0; } -#define EXTRA_STACK_VM_PAGES 20 /* random */ +#define EXTRA_STACK_VM_SIZE 81920UL /* randomly 20 4K pages */ /* * Finalizes the stack vm_area_struct. The flags and permissions are updated, @@ -627,10 +627,13 @@ int setup_arg_pages(struct linux_binprm goto out_unlock; } + stack_base = min(EXTRA_STACK_VM_SIZE, + current->signal->rlim[RLIMIT_STACK].rlim_cur) - + PAGE_SIZE; #ifdef CONFIG_STACK_GROWSUP - stack_base = vma->vm_end + EXTRA_STACK_VM_PAGES * PAGE_SIZE; + stack_base = vma->vm_end + stack_base; #else - stack_base = vma->vm_start - EXTRA_STACK_VM_PAGES * PAGE_SIZE; + stack_base = vma->vm_start - stack_base; #endif ret = expand_stack(vma, stack_base); if (ret) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |