fs/binfmt_elf.c: extract elf_read() function
ELF reads done by the kernel have very complicated error detection code which better live in one place. Link: http://lkml.kernel.org/r/20191005165215.GB26927@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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81696d5d54
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658c033565
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@ -404,6 +404,17 @@ static unsigned long total_mapping_size(const struct elf_phdr *cmds, int nr)
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ELF_PAGESTART(cmds[first_idx].p_vaddr);
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}
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static int elf_read(struct file *file, void *buf, size_t len, loff_t pos)
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{
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ssize_t rv;
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rv = kernel_read(file, buf, len, &pos);
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if (unlikely(rv != len)) {
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return (rv < 0) ? rv : -EIO;
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}
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return 0;
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}
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/**
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* load_elf_phdrs() - load ELF program headers
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* @elf_ex: ELF header of the binary whose program headers should be loaded
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@ -418,7 +429,6 @@ static struct elf_phdr *load_elf_phdrs(const struct elfhdr *elf_ex,
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{
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struct elf_phdr *elf_phdata = NULL;
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int retval, err = -1;
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loff_t pos = elf_ex->e_phoff;
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unsigned int size;
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/*
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@ -439,9 +449,9 @@ static struct elf_phdr *load_elf_phdrs(const struct elfhdr *elf_ex,
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goto out;
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/* Read in the program headers */
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retval = kernel_read(elf_file, elf_phdata, size, &pos);
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if (retval != size) {
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err = (retval < 0) ? retval : -EIO;
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retval = elf_read(elf_file, elf_phdata, size, elf_ex->e_phoff);
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if (retval < 0) {
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err = retval;
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goto out;
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}
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@ -720,7 +730,6 @@ static int load_elf_binary(struct linux_binprm *bprm)
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elf_ppnt = elf_phdata;
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for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++) {
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char *elf_interpreter;
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loff_t pos;
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if (elf_ppnt->p_type != PT_INTERP)
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continue;
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@ -738,14 +747,10 @@ static int load_elf_binary(struct linux_binprm *bprm)
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if (!elf_interpreter)
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goto out_free_ph;
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pos = elf_ppnt->p_offset;
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retval = kernel_read(bprm->file, elf_interpreter,
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elf_ppnt->p_filesz, &pos);
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if (retval != elf_ppnt->p_filesz) {
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if (retval >= 0)
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retval = -EIO;
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retval = elf_read(bprm->file, elf_interpreter, elf_ppnt->p_filesz,
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elf_ppnt->p_offset);
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if (retval < 0)
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goto out_free_interp;
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}
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/* make sure path is NULL terminated */
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retval = -ENOEXEC;
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if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0')
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@ -764,14 +769,10 @@ static int load_elf_binary(struct linux_binprm *bprm)
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would_dump(bprm, interpreter);
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/* Get the exec headers */
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pos = 0;
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retval = kernel_read(interpreter, &loc->interp_elf_ex,
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sizeof(loc->interp_elf_ex), &pos);
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if (retval != sizeof(loc->interp_elf_ex)) {
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if (retval >= 0)
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retval = -EIO;
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retval = elf_read(interpreter, &loc->interp_elf_ex,
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sizeof(loc->interp_elf_ex), 0);
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if (retval < 0)
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goto out_free_dentry;
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}
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break;
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@ -1174,11 +1175,10 @@ static int load_elf_library(struct file *file)
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unsigned long elf_bss, bss, len;
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int retval, error, i, j;
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struct elfhdr elf_ex;
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loff_t pos = 0;
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error = -ENOEXEC;
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retval = kernel_read(file, &elf_ex, sizeof(elf_ex), &pos);
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if (retval != sizeof(elf_ex))
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retval = elf_read(file, &elf_ex, sizeof(elf_ex), 0);
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if (retval < 0)
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goto out;
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if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
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@ -1203,9 +1203,8 @@ static int load_elf_library(struct file *file)
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eppnt = elf_phdata;
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error = -ENOEXEC;
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pos = elf_ex.e_phoff;
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retval = kernel_read(file, eppnt, j, &pos);
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if (retval != j)
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retval = elf_read(file, eppnt, j, elf_ex.e_phoff);
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if (retval < 0)
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goto out_free_ph;
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for (j = 0, i = 0; i<elf_ex.e_phnum; i++)
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