From 13479d52c7a61a18900d7f36730b7d3b43723d97 Mon Sep 17 00:00:00 2001 From: Jeff Dike Date: Fri, 20 May 2005 13:59:08 -0700 Subject: [PATCH] uml: Page fault fixes Any access to a PROT_NONE page should segfault the process. A JVM seems to do this on purpose. Also, Al noticed some bogus code, which is now deleted. Signed-off-by: Jeff Dike Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/kernel/trap_kern.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) (limited to 'arch/um/kernel/trap_kern.c') diff --git a/arch/um/kernel/trap_kern.c b/arch/um/kernel/trap_kern.c index 5fca2c61eb98..9ae2eff0d8f3 100644 --- a/arch/um/kernel/trap_kern.c +++ b/arch/um/kernel/trap_kern.c @@ -57,10 +57,11 @@ int handle_page_fault(unsigned long address, unsigned long ip, *code_out = SEGV_ACCERR; if(is_write && !(vma->vm_flags & VM_WRITE)) goto out; + + if(!(vma->vm_flags & (VM_READ | VM_EXEC))) + goto out; + page = address & PAGE_MASK; - pgd = pgd_offset(mm, page); - pud = pud_offset(pgd, page); - pmd = pmd_offset(pud, page); do { survive: switch (handle_mm_fault(mm, vma, address, is_write)){ -- cgit v1.2.2 From 7b9014c1da380384efe7752db38a0253a74d0238 Mon Sep 17 00:00:00 2001 From: Jeff Dike Date: Fri, 20 May 2005 13:59:11 -0700 Subject: [PATCH] uml: Remove ubd-mmap support Finally rip out the ubd-mmap code, which turned out to be broken by design. Signed-off-by: Jeff Dike Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/kernel/trap_kern.c | 29 ----------------------------- 1 file changed, 29 deletions(-) (limited to 'arch/um/kernel/trap_kern.c') diff --git a/arch/um/kernel/trap_kern.c b/arch/um/kernel/trap_kern.c index 9ae2eff0d8f3..1de22d8a313a 100644 --- a/arch/um/kernel/trap_kern.c +++ b/arch/um/kernel/trap_kern.c @@ -107,33 +107,6 @@ out_of_memory: goto out; } -LIST_HEAD(physmem_remappers); - -void register_remapper(struct remapper *info) -{ - list_add(&info->list, &physmem_remappers); -} - -static int check_remapped_addr(unsigned long address, int is_write) -{ - struct remapper *remapper; - struct list_head *ele; - __u64 offset; - int fd; - - fd = phys_mapping(__pa(address), &offset); - if(fd == -1) - return(0); - - list_for_each(ele, &physmem_remappers){ - remapper = list_entry(ele, struct remapper, list); - if((*remapper->proc)(fd, address, is_write, offset)) - return(1); - } - - return(0); -} - /* * We give a *copy* of the faultinfo in the regs to segv. * This must be done, since nesting SEGVs could overwrite @@ -152,8 +125,6 @@ unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user, void *sc) flush_tlb_kernel_vm(); return(0); } - else if(check_remapped_addr(address & PAGE_MASK, is_write)) - return(0); else if(current->mm == NULL) panic("Segfault with no mm"); err = handle_page_fault(address, ip, is_write, is_user, &si.si_code); -- cgit v1.2.2 From a2e4b972c99685d9d7b869c4bf8d8b258ff5b60c Mon Sep 17 00:00:00 2001 From: Jeff Dike Date: Sat, 28 May 2005 15:51:54 -0700 Subject: [PATCH] uml: remove 2_5compat.h Remove old useless header that was used in Ye Olde Times during 2.4->2.5 porting to abstract differences. It's definitions are no more used anyway, so let's finally kill it. Signed-off-by: Paolo 'Blaisorblade' Giarrusso Signed-off-by: Jeff Dike Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/kernel/trap_kern.c | 1 - 1 file changed, 1 deletion(-) (limited to 'arch/um/kernel/trap_kern.c') diff --git a/arch/um/kernel/trap_kern.c b/arch/um/kernel/trap_kern.c index 1de22d8a313a..c20aef120598 100644 --- a/arch/um/kernel/trap_kern.c +++ b/arch/um/kernel/trap_kern.c @@ -23,7 +23,6 @@ #include "kern.h" #include "chan_kern.h" #include "mconsole_kern.h" -#include "2_5compat.h" #include "mem.h" #include "mem_kern.h" -- cgit v1.2.2