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authorRussell King <rmk+kernel@armlinux.org.uk>2017-09-28 11:16:33 +0100
committerRussell King <rmk+kernel@armlinux.org.uk>2017-10-02 23:16:29 +0100
commit1bb078330b4f0836b5b12365cd8bf68d5f3bbff8 (patch)
tree0a15f41ace12c4b308ef6cc57e5aa3be0019e05d /fs/binfmt_elf.c
parent476242482bdee72b30f188c2e025f0fa5df0208c (diff)
parentcdf38888ed30523b1a6ee199449a86dbd1d864ce (diff)
Merge branch 'fdpic' of http://git.linaro.org/people/nicolas.pitre/linux into devel-stable
This series provides the needed changes to suport the ELF_FDPIC binary format on ARM. Both MMU and non-MMU systems are supported. This format has many advantages over the BFLT format used on MMU-less systems, such as being real ELF that can be parsed by standard tools, can support shared dynamic libs, etc.
Diffstat (limited to 'fs/binfmt_elf.c')
-rw-r--r--fs/binfmt_elf.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 73b01e474fdc..e4f7ef8294ac 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -51,6 +51,11 @@
#define user_siginfo_t siginfo_t
#endif
+/* That's for binfmt_elf_fdpic to deal with */
+#ifndef elf_check_fdpic
+#define elf_check_fdpic(ex) false
+#endif
+
static int load_elf_binary(struct linux_binprm *bprm);
static unsigned long elf_map(struct file *, unsigned long, struct elf_phdr *,
int, int, unsigned long);
@@ -541,7 +546,8 @@ static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex,
if (interp_elf_ex->e_type != ET_EXEC &&
interp_elf_ex->e_type != ET_DYN)
goto out;
- if (!elf_check_arch(interp_elf_ex))
+ if (!elf_check_arch(interp_elf_ex) ||
+ elf_check_fdpic(interp_elf_ex))
goto out;
if (!interpreter->f_op->mmap)
goto out;
@@ -718,6 +724,8 @@ static int load_elf_binary(struct linux_binprm *bprm)
goto out;
if (!elf_check_arch(&loc->elf_ex))
goto out;
+ if (elf_check_fdpic(&loc->elf_ex))
+ goto out;
if (!bprm->file->f_op->mmap)
goto out;
@@ -817,7 +825,8 @@ static int load_elf_binary(struct linux_binprm *bprm)
if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
goto out_free_dentry;
/* Verify the interpreter has a valid arch */
- if (!elf_check_arch(&loc->interp_elf_ex))
+ if (!elf_check_arch(&loc->interp_elf_ex) ||
+ elf_check_fdpic(&loc->interp_elf_ex))
goto out_free_dentry;
/* Load the interpreter program headers */
@@ -1190,6 +1199,8 @@ static int load_elf_library(struct file *file)
if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 ||
!elf_check_arch(&elf_ex) || !file->f_op->mmap)
goto out;
+ if (elf_check_fdpic(&elf_ex))
+ goto out;
/* Now read in all of the header information */