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Subject[PATCH 08/15] binfmt_flat: add endianess annotations
Date
Most binfmt_flat on-disk fields are big endian.  Use the proper __be32
type where applicable.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/binfmt_flat.c | 26 ++++++++++++++++----------
1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
index 6ae0f9af3fc9..6c1848dee724 100644
--- a/fs/binfmt_flat.c
+++ b/fs/binfmt_flat.c
@@ -421,7 +421,8 @@ static int load_flat_file(struct linux_binprm *bprm,
unsigned long textpos, datapos, realdatastart;
u32 text_len, data_len, bss_len, stack_len, full_data, flags;
unsigned long len, memp, memp_size, extra, rlim;
- u32 __user *reloc, *rp;
+ __be32 __user *reloc;
+ u32 __user *rp;
struct inode *inode;
int i, rev, relocs;
loff_t fpos;
@@ -594,7 +595,7 @@ static int load_flat_file(struct linux_binprm *bprm,
goto err;
}

- reloc = (u32 __user *)
+ reloc = (__be32 __user *)
(datapos + (ntohl(hdr->reloc_start) - text_len));
memp = realdatastart;
memp_size = len;
@@ -619,7 +620,7 @@ static int load_flat_file(struct linux_binprm *bprm,
MAX_SHARED_LIBS * sizeof(u32),
FLAT_DATA_ALIGN);

- reloc = (u32 __user *)
+ reloc = (__be32 __user *)
(datapos + (ntohl(hdr->reloc_start) - text_len));
memp = textpos;
memp_size = len;
@@ -785,15 +786,16 @@ static int load_flat_file(struct linux_binprm *bprm,
u32 __maybe_unused persistent = 0;
for (i = 0; i < relocs; i++) {
u32 addr, relval;
+ __be32 tmp;

/*
* Get the address of the pointer to be
* relocated (of course, the address has to be
* relocated first).
*/
- if (get_user(relval, reloc + i))
+ if (get_user(tmp, reloc + i))
return -EFAULT;
- relval = ntohl(relval);
+ relval = ntohl(tmp);
addr = flat_get_relocate_addr(relval);
rp = (u32 __user *)calc_reloc(addr, libinfo, id, 1);
if (rp == (u32 __user *)RELOC_FAILED) {
@@ -812,8 +814,13 @@ static int load_flat_file(struct linux_binprm *bprm,
* Do the relocation. PIC relocs in the data section are
* already in target order
*/
- if ((flags & FLAT_FLAG_GOTPIC) == 0)
- addr = ntohl(addr);
+ if ((flags & FLAT_FLAG_GOTPIC) == 0) {
+ /*
+ * Meh, the same value can have a different
+ * byte order based on a flag..
+ */
+ addr = ntohl((__force __be32)addr);
+ }
addr = calc_reloc(addr, libinfo, id, 0);
if (addr == RELOC_FAILED) {
ret = -ENOEXEC;
@@ -828,11 +835,10 @@ static int load_flat_file(struct linux_binprm *bprm,
}
} else {
for (i = 0; i < relocs; i++) {
- u32 relval;
+ __be32 relval;
if (get_user(relval, reloc + i))
return -EFAULT;
- relval = ntohl(relval);
- old_reloc(relval);
+ old_reloc(ntohl(relval));
}
}

--
2.20.1
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