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-rw-r--r--fs/binfmt_elf.c13
-rw-r--r--include/uapi/asm-generic/mman-common.h4
2 files changed, 12 insertions, 5 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 3edca6cb9a33..46f0438088d3 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -377,6 +377,11 @@ static unsigned long elf_map(struct file *filep, unsigned long addr,
} else
map_addr = vm_mmap(filep, addr, size, prot, type, off);
+ if ((type & MAP_FIXED_NOREPLACE) && BAD_ADDR(map_addr))
+ pr_info("%d (%s): Uhuuh, elf segment at %p requested but the memory is mapped already\n",
+ task_pid_nr(current), current->comm,
+ (void *)addr);
+
return(map_addr);
}
@@ -575,7 +580,7 @@ static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex,
elf_prot |= PROT_EXEC;
vaddr = eppnt->p_vaddr;
if (interp_elf_ex->e_type == ET_EXEC || load_addr_set)
- elf_type |= MAP_FIXED;
+ elf_type |= MAP_FIXED_NOREPLACE;
else if (no_base && interp_elf_ex->e_type == ET_DYN)
load_addr = -vaddr;
@@ -939,7 +944,7 @@ static int load_elf_binary(struct linux_binprm *bprm)
* the ET_DYN load_addr calculations, proceed normally.
*/
if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) {
- elf_flags |= MAP_FIXED;
+ elf_flags |= MAP_FIXED_NOREPLACE;
} else if (loc->elf_ex.e_type == ET_DYN) {
/*
* This logic is run once for the first LOAD Program
@@ -975,7 +980,7 @@ static int load_elf_binary(struct linux_binprm *bprm)
load_bias = ELF_ET_DYN_BASE;
if (current->flags & PF_RANDOMIZE)
load_bias += arch_mmap_rnd();
- elf_flags |= MAP_FIXED;
+ elf_flags |= MAP_FIXED_NOREPLACE;
} else
load_bias = 0;
@@ -1235,7 +1240,7 @@ static int load_elf_library(struct file *file)
(eppnt->p_filesz +
ELF_PAGEOFFSET(eppnt->p_vaddr)),
PROT_READ | PROT_WRITE | PROT_EXEC,
- MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
+ MAP_FIXED_NOREPLACE | MAP_PRIVATE | MAP_DENYWRITE,
(eppnt->p_offset -
ELF_PAGEOFFSET(eppnt->p_vaddr)));
if (error != ELF_PAGESTART(eppnt->p_vaddr))
diff --git a/include/uapi/asm-generic/mman-common.h b/include/uapi/asm-generic/mman-common.h
index 4aa65a8d7e92..e7ee32861d51 100644
--- a/include/uapi/asm-generic/mman-common.h
+++ b/include/uapi/asm-generic/mman-common.h
@@ -26,7 +26,9 @@
#else
# define MAP_UNINITIALIZED 0x0 /* Don't support this flag */
#endif
-#define MAP_FIXED_NOREPLACE 0x80000 /* MAP_FIXED which doesn't unmap underlying mapping */
+
+/* 0x0100 - 0x80000 flags are defined in asm-generic/mman.h */
+#define MAP_FIXED_NOREPLACE 0x100000 /* MAP_FIXED which doesn't unmap underlying mapping */
/*
* Flags for mlock