On 6/10/19 10:20 PM, Christoph Hellwig wrote: > Most binfmt_flat on-disk fields are big endian. Use the proper __be32 > type where applicable. > > Signed-off-by: Christoph Hellwig <h...@lst.de> > --- > fs/binfmt_flat.c | 26 ++++++++++++++++---------- > 1 file changed, 16 insertions(+), 10 deletions(-)
Tested-by: Vladimir Murzin <vladimir.mur...@arm.com> Reviewed-by: Vladimir Murzin <vladimir.mur...@arm.com> > > 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)); > } > } > >