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hw/elf_ops.h: switch to ssize_t for elf loader return type
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Until now, int was used as the return type for all the ELF
loader related functions. The returned value is the sum of all loaded
program headers "MemSize" fields.

Because of the overflow check in elf_ops.h, trying to load an ELF bigger
than INT_MAX will fail. Switch to ssize_t to remove this limitation.

Signed-off-by: Luc Michel <[email protected]>
Reviewed-by: Philippe Mathieu-Daudé <[email protected]>
Reviewed-by: Richard Henderson <[email protected]>
Reviewed-by: Stefano Garzarella <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Richard Henderson <[email protected]>
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@luc-mchl @rth7680
luc-mchl authored and rth7680 committed Oct 20, 2021
1 parent b84722c commit 8975eb8
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Showing 3 changed files with 74 additions and 71 deletions.
60 changes: 31 additions & 29 deletions hw/core/loader.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -326,7 +326,7 @@ static void *load_at(int fd, off_t offset, size_t size)
#define SZ 64
#include "hw/elf_ops.h"

const char *load_elf_strerror(int error)
const char *load_elf_strerror(ssize_t error)
{
switch (error) {
case 0:
Expand Down Expand Up @@ -402,39 +402,40 @@ void load_elf_hdr(const char *filename, void *hdr, bool *is64, Error **errp)
}

/* return < 0 if error, otherwise the number of bytes loaded in memory */
int load_elf(const char *filename,
uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
uint64_t *highaddr, uint32_t *pflags, int big_endian,
int elf_machine, int clear_lsb, int data_swab)
ssize_t load_elf(const char *filename,
uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
uint64_t *highaddr, uint32_t *pflags, int big_endian,
int elf_machine, int clear_lsb, int data_swab)
{
return load_elf_as(filename, elf_note_fn, translate_fn, translate_opaque,
pentry, lowaddr, highaddr, pflags, big_endian,
elf_machine, clear_lsb, data_swab, NULL);
}

/* return < 0 if error, otherwise the number of bytes loaded in memory */
int load_elf_as(const char *filename,
uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
uint64_t *highaddr, uint32_t *pflags, int big_endian,
int elf_machine, int clear_lsb, int data_swab, AddressSpace *as)
ssize_t load_elf_as(const char *filename,
uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
uint64_t *highaddr, uint32_t *pflags, int big_endian,
int elf_machine, int clear_lsb, int data_swab,
AddressSpace *as)
{
return load_elf_ram(filename, elf_note_fn, translate_fn, translate_opaque,
pentry, lowaddr, highaddr, pflags, big_endian,
elf_machine, clear_lsb, data_swab, as, true);
}

/* return < 0 if error, otherwise the number of bytes loaded in memory */
int load_elf_ram(const char *filename,
uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
uint64_t *highaddr, uint32_t *pflags, int big_endian,
int elf_machine, int clear_lsb, int data_swab,
AddressSpace *as, bool load_rom)
ssize_t load_elf_ram(const char *filename,
uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry,
uint64_t *lowaddr, uint64_t *highaddr, uint32_t *pflags,
int big_endian, int elf_machine, int clear_lsb,
int data_swab, AddressSpace *as, bool load_rom)
{
return load_elf_ram_sym(filename, elf_note_fn,
translate_fn, translate_opaque,
Expand All @@ -444,16 +445,17 @@ int load_elf_ram(const char *filename,
}

/* return < 0 if error, otherwise the number of bytes loaded in memory */
int load_elf_ram_sym(const char *filename,
uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry,
uint64_t *lowaddr, uint64_t *highaddr, uint32_t *pflags,
int big_endian, int elf_machine,
int clear_lsb, int data_swab,
AddressSpace *as, bool load_rom, symbol_fn_t sym_cb)
ssize_t load_elf_ram_sym(const char *filename,
uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry,
uint64_t *lowaddr, uint64_t *highaddr,
uint32_t *pflags, int big_endian, int elf_machine,
int clear_lsb, int data_swab,
AddressSpace *as, bool load_rom, symbol_fn_t sym_cb)
{
int fd, data_order, target_data_order, must_swab, ret = ELF_LOAD_FAILED;
int fd, data_order, target_data_order, must_swab;
ssize_t ret = ELF_LOAD_FAILED;
uint8_t e_ident[EI_NIDENT];

fd = open(filename, O_RDONLY | O_BINARY);
Expand Down
27 changes: 14 additions & 13 deletions include/hw/elf_ops.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -312,25 +312,26 @@ static struct elf_note *glue(get_elf_note_type, SZ)(struct elf_note *nhdr,
return nhdr;
}

static int glue(load_elf, SZ)(const char *name, int fd,
uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque,
int must_swab, uint64_t *pentry,
uint64_t *lowaddr, uint64_t *highaddr,
uint32_t *pflags, int elf_machine,
int clear_lsb, int data_swab,
AddressSpace *as, bool load_rom,
symbol_fn_t sym_cb)
static ssize_t glue(load_elf, SZ)(const char *name, int fd,
uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque,
int must_swab, uint64_t *pentry,
uint64_t *lowaddr, uint64_t *highaddr,
uint32_t *pflags, int elf_machine,
int clear_lsb, int data_swab,
AddressSpace *as, bool load_rom,
symbol_fn_t sym_cb)
{
struct elfhdr ehdr;
struct elf_phdr *phdr = NULL, *ph;
int size, i, total_size;
int size, i;
ssize_t total_size;
elf_word mem_size, file_size, data_offset;
uint64_t addr, low = (uint64_t)-1, high = 0;
GMappedFile *mapped_file = NULL;
uint8_t *data = NULL;
int ret = ELF_LOAD_FAILED;
ssize_t ret = ELF_LOAD_FAILED;

if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
goto fail;
Expand Down Expand Up @@ -482,7 +483,7 @@ static int glue(load_elf, SZ)(const char *name, int fd,
}
}

if (mem_size > INT_MAX - total_size) {
if (mem_size > SSIZE_MAX - total_size) {
ret = ELF_LOAD_TOO_BIG;
goto fail;
}
Expand Down
58 changes: 29 additions & 29 deletions include/hw/loader.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -90,7 +90,7 @@ int load_image_gzipped(const char *filename, hwaddr addr, uint64_t max_sz);
#define ELF_LOAD_WRONG_ARCH -3
#define ELF_LOAD_WRONG_ENDIAN -4
#define ELF_LOAD_TOO_BIG -5
const char *load_elf_strerror(int error);
const char *load_elf_strerror(ssize_t error);

/** load_elf_ram_sym:
* @filename: Path of ELF file
Expand Down Expand Up @@ -128,48 +128,48 @@ const char *load_elf_strerror(int error);
typedef void (*symbol_fn_t)(const char *st_name, int st_info,
uint64_t st_value, uint64_t st_size);

int load_elf_ram_sym(const char *filename,
uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry,
uint64_t *lowaddr, uint64_t *highaddr, uint32_t *pflags,
int big_endian, int elf_machine,
int clear_lsb, int data_swab,
AddressSpace *as, bool load_rom, symbol_fn_t sym_cb);
ssize_t load_elf_ram_sym(const char *filename,
uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry,
uint64_t *lowaddr, uint64_t *highaddr,
uint32_t *pflags, int big_endian, int elf_machine,
int clear_lsb, int data_swab,
AddressSpace *as, bool load_rom, symbol_fn_t sym_cb);

/** load_elf_ram:
* Same as load_elf_ram_sym(), but doesn't allow the caller to specify a
* symbol callback function
*/
int load_elf_ram(const char *filename,
uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
uint64_t *highaddr, uint32_t *pflags, int big_endian,
int elf_machine, int clear_lsb, int data_swab,
AddressSpace *as, bool load_rom);
ssize_t load_elf_ram(const char *filename,
uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry,
uint64_t *lowaddr, uint64_t *highaddr, uint32_t *pflags,
int big_endian, int elf_machine, int clear_lsb,
int data_swab, AddressSpace *as, bool load_rom);

/** load_elf_as:
* Same as load_elf_ram(), but always loads the elf as ROM
*/
int load_elf_as(const char *filename,
uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
uint64_t *highaddr, uint32_t *pflags, int big_endian,
int elf_machine, int clear_lsb, int data_swab,
AddressSpace *as);
ssize_t load_elf_as(const char *filename,
uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
uint64_t *highaddr, uint32_t *pflags, int big_endian,
int elf_machine, int clear_lsb, int data_swab,
AddressSpace *as);

/** load_elf:
* Same as load_elf_as(), but doesn't allow the caller to specify an
* AddressSpace.
*/
int load_elf(const char *filename,
uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
uint64_t *highaddr, uint32_t *pflags, int big_endian,
int elf_machine, int clear_lsb, int data_swab);
ssize_t load_elf(const char *filename,
uint64_t (*elf_note_fn)(void *, void *, bool),
uint64_t (*translate_fn)(void *, uint64_t),
void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
uint64_t *highaddr, uint32_t *pflags, int big_endian,
int elf_machine, int clear_lsb, int data_swab);

/** load_elf_hdr:
* @filename: Path of ELF file
Expand Down

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