diff options
author | Clement Leger | 2020-03-02 10:39:00 +0100 |
---|---|---|
committer | Bjorn Andersson | 2020-03-25 22:29:40 -0700 |
commit | f31e339f1b9b765c8c727d635c1b74424c102c1e (patch) | |
tree | 3b2b3a819cd1adb9efc51b93119edcf19c948bac /drivers/remoteproc | |
parent | 826c339099295312eb9bc207197f3beb6ff19051 (diff) |
remoteproc: Add elf64 support in elf loader
In order to support elf64, use macros from remoteproc_elf_helpers.h
to access elf headers depending on elf class.
To allow new drivers to support elf64, add rproc_elf_sanity_check
function which make more sense than adding a elf64 named one since
it will support both elf versions.
Driver which need to support both elf32/elf64 should use this new
function for elf sanity check instead of the elf32 one.
Signed-off-by: Clement Leger <cleger@kalray.eu>
Tested-by: Arnaud POULIQUEN <arnaud.pouliquen@st.com>
Link: https://lore.kernel.org/r/20200302093902.27849-7-cleger@kalray.eu
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Diffstat (limited to 'drivers/remoteproc')
-rw-r--r-- | drivers/remoteproc/remoteproc_elf_loader.c | 186 | ||||
-rw-r--r-- | drivers/remoteproc/remoteproc_internal.h | 10 |
2 files changed, 140 insertions, 56 deletions
diff --git a/drivers/remoteproc/remoteproc_elf_loader.c b/drivers/remoteproc/remoteproc_elf_loader.c index 5a67745f2638..4869fb7d8fe4 100644 --- a/drivers/remoteproc/remoteproc_elf_loader.c +++ b/drivers/remoteproc/remoteproc_elf_loader.c @@ -23,20 +23,29 @@ #include <linux/elf.h> #include "remoteproc_internal.h" +#include "remoteproc_elf_helpers.h" /** - * rproc_elf_sanity_check() - Sanity Check ELF32 firmware image + * rproc_elf_sanity_check() - Sanity Check for ELF32/ELF64 firmware image * @rproc: the remote processor handle * @fw: the ELF firmware image * - * Make sure this fw image is sane. + * Make sure this fw image is sane (ie a correct ELF32/ELF64 file). */ -int rproc_elf32_sanity_check(struct rproc *rproc, const struct firmware *fw) +int rproc_elf_sanity_check(struct rproc *rproc, const struct firmware *fw) { const char *name = rproc->firmware; struct device *dev = &rproc->dev; + /* + * Elf files are beginning with the same structure. Thus, to simplify + * header parsing, we can use the elf32_hdr one for both elf64 and + * elf32. + */ struct elf32_hdr *ehdr; + u32 elf_shdr_get_size; + u64 phoff, shoff; char class; + u16 phnum; if (!fw) { dev_err(dev, "failed to load %s\n", name); @@ -50,13 +59,22 @@ int rproc_elf32_sanity_check(struct rproc *rproc, const struct firmware *fw) ehdr = (struct elf32_hdr *)fw->data; - /* We only support ELF32 at this point */ + if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG)) { + dev_err(dev, "Image is corrupted (bad magic)\n"); + return -EINVAL; + } + class = ehdr->e_ident[EI_CLASS]; - if (class != ELFCLASS32) { + if (class != ELFCLASS32 && class != ELFCLASS64) { dev_err(dev, "Unsupported class: %d\n", class); return -EINVAL; } + if (class == ELFCLASS64 && fw->size < sizeof(struct elf64_hdr)) { + dev_err(dev, "elf64 header is too small\n"); + return -EINVAL; + } + /* We assume the firmware has the same endianness as the host */ # ifdef __LITTLE_ENDIAN if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB) { @@ -67,28 +85,52 @@ int rproc_elf32_sanity_check(struct rproc *rproc, const struct firmware *fw) return -EINVAL; } - if (fw->size < ehdr->e_shoff + sizeof(struct elf32_shdr)) { - dev_err(dev, "Image is too small\n"); - return -EINVAL; - } + phoff = elf_hdr_get_e_phoff(class, fw->data); + shoff = elf_hdr_get_e_shoff(class, fw->data); + phnum = elf_hdr_get_e_phnum(class, fw->data); + elf_shdr_get_size = elf_size_of_shdr(class); - if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG)) { - dev_err(dev, "Image is corrupted (bad magic)\n"); + if (fw->size < shoff + elf_shdr_get_size) { + dev_err(dev, "Image is too small\n"); return -EINVAL; } - if (ehdr->e_phnum == 0) { + if (phnum == 0) { dev_err(dev, "No loadable segments\n"); return -EINVAL; } - if (ehdr->e_phoff > fw->size) { + if (phoff > fw->size) { dev_err(dev, "Firmware size is too small\n"); return -EINVAL; } + dev_dbg(dev, "Firmware is an elf%d file\n", + class == ELFCLASS32 ? 32 : 64); + return 0; } +EXPORT_SYMBOL(rproc_elf_sanity_check); + +/** + * rproc_elf_sanity_check() - Sanity Check ELF32 firmware image + * @rproc: the remote processor handle + * @fw: the ELF32 firmware image + * + * Make sure this fw image is sane. + */ +int rproc_elf32_sanity_check(struct rproc *rproc, const struct firmware *fw) +{ + int ret = rproc_elf_sanity_check(rproc, fw); + + if (ret) + return ret; + + if (fw_elf_get_class(fw) == ELFCLASS32) + return 0; + + return -EINVAL; +} EXPORT_SYMBOL(rproc_elf32_sanity_check); /** @@ -104,9 +146,7 @@ EXPORT_SYMBOL(rproc_elf32_sanity_check); */ u64 rproc_elf_get_boot_addr(struct rproc *rproc, const struct firmware *fw) { - struct elf32_hdr *ehdr = (struct elf32_hdr *)fw->data; - - return ehdr->e_entry; + return elf_hdr_get_e_entry(fw_elf_get_class(fw), fw->data); } EXPORT_SYMBOL(rproc_elf_get_boot_addr); @@ -137,53 +177,65 @@ EXPORT_SYMBOL(rproc_elf_get_boot_addr); int rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw) { struct device *dev = &rproc->dev; - struct elf32_hdr *ehdr; - struct elf32_phdr *phdr; + const void *ehdr, *phdr; int i, ret = 0; + u16 phnum; const u8 *elf_data = fw->data; + u8 class = fw_elf_get_class(fw); + u32 elf_phdr_get_size = elf_size_of_phdr(class); - ehdr = (struct elf32_hdr *)elf_data; - phdr = (struct elf32_phdr *)(elf_data + ehdr->e_phoff); + ehdr = elf_data; + phnum = elf_hdr_get_e_phnum(class, ehdr); + phdr = elf_data + elf_hdr_get_e_phoff(class, ehdr); /* go through the available ELF segments */ - for (i = 0; i < ehdr->e_phnum; i++, phdr++) { - u32 da = phdr->p_paddr; - u32 memsz = phdr->p_memsz; - u32 filesz = phdr->p_filesz; - u32 offset = phdr->p_offset; + for (i = 0; i < phnum; i++, phdr += elf_phdr_get_size) { + u64 da = elf_phdr_get_p_paddr(class, phdr); + u64 memsz = elf_phdr_get_p_memsz(class, phdr); + u64 filesz = elf_phdr_get_p_filesz(class, phdr); + u64 offset = elf_phdr_get_p_offset(class, phdr); + u32 type = elf_phdr_get_p_type(class, phdr); void *ptr; - if (phdr->p_type != PT_LOAD) + if (type != PT_LOAD) continue; - dev_dbg(dev, "phdr: type %d da 0x%x memsz 0x%x filesz 0x%x\n", - phdr->p_type, da, memsz, filesz); + dev_dbg(dev, "phdr: type %d da 0x%llx memsz 0x%llx filesz 0x%llx\n", + type, da, memsz, filesz); if (filesz > memsz) { - dev_err(dev, "bad phdr filesz 0x%x memsz 0x%x\n", + dev_err(dev, "bad phdr filesz 0x%llx memsz 0x%llx\n", filesz, memsz); ret = -EINVAL; break; } if (offset + filesz > fw->size) { - dev_err(dev, "truncated fw: need 0x%x avail 0x%zx\n", + dev_err(dev, "truncated fw: need 0x%llx avail 0x%zx\n", offset + filesz, fw->size); ret = -EINVAL; break; } + if (!rproc_u64_fit_in_size_t(memsz)) { + dev_err(dev, "size (%llx) does not fit in size_t type\n", + memsz); + ret = -EOVERFLOW; + break; + } + /* grab the kernel address for this device address */ ptr = rproc_da_to_va(rproc, da, memsz); if (!ptr) { - dev_err(dev, "bad phdr da 0x%x mem 0x%x\n", da, memsz); + dev_err(dev, "bad phdr da 0x%llx mem 0x%llx\n", da, + memsz); ret = -EINVAL; break; } /* put the segment where the remote processor expects it */ - if (phdr->p_filesz) - memcpy(ptr, elf_data + phdr->p_offset, filesz); + if (filesz) + memcpy(ptr, elf_data + offset, filesz); /* * Zero out remaining memory for this segment. @@ -200,24 +252,35 @@ int rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw) } EXPORT_SYMBOL(rproc_elf_load_segments); -static struct elf32_shdr * -find_table(struct device *dev, struct elf32_hdr *ehdr, size_t fw_size) +static const void * +find_table(struct device *dev, const struct firmware *fw) { - struct elf32_shdr *shdr; + const void *shdr, *name_table_shdr; int i; const char *name_table; struct resource_table *table = NULL; - const u8 *elf_data = (void *)ehdr; + const u8 *elf_data = (void *)fw->data; + u8 class = fw_elf_get_class(fw); + size_t fw_size = fw->size; + const void *ehdr = elf_data; + u16 shnum = elf_hdr_get_e_shnum(class, ehdr); + u32 elf_shdr_get_size = elf_size_of_shdr(class); + u16 shstrndx = elf_hdr_get_e_shstrndx(class, ehdr); /* look for the resource table and handle it */ - shdr = (struct elf32_shdr *)(elf_data + ehdr->e_shoff); - name_table = elf_data + shdr[ehdr->e_shstrndx].sh_offset; - - for (i = 0; i < ehdr->e_shnum; i++, shdr++) { - u32 size = shdr->sh_size; - u32 offset = shdr->sh_offset; - - if (strcmp(name_table + shdr->sh_name, ".resource_table")) + /* First, get the section header according to the elf class */ + shdr = elf_data + elf_hdr_get_e_shoff(class, ehdr); + /* Compute name table section header entry in shdr array */ + name_table_shdr = shdr + (shstrndx * elf_shdr_get_size); + /* Finally, compute the name table section address in elf */ + name_table = elf_data + elf_shdr_get_sh_offset(class, name_table_shdr); + + for (i = 0; i < shnum; i++, shdr += elf_shdr_get_size) { + u64 size = elf_shdr_get_sh_size(class, shdr); + u64 offset = elf_shdr_get_sh_offset(class, shdr); + u32 name = elf_shdr_get_sh_name(class, shdr); + + if (strcmp(name_table + name, ".resource_table")) continue; table = (struct resource_table *)(elf_data + offset); @@ -270,21 +333,21 @@ find_table(struct device *dev, struct elf32_hdr *ehdr, size_t fw_size) */ int rproc_elf_load_rsc_table(struct rproc *rproc, const struct firmware *fw) { - struct elf32_hdr *ehdr; - struct elf32_shdr *shdr; + const void *shdr; struct device *dev = &rproc->dev; struct resource_table *table = NULL; const u8 *elf_data = fw->data; size_t tablesz; + u8 class = fw_elf_get_class(fw); + u64 sh_offset; - ehdr = (struct elf32_hdr *)elf_data; - - shdr = find_table(dev, ehdr, fw->size); + shdr = find_table(dev, fw); if (!shdr) return -EINVAL; - table = (struct resource_table *)(elf_data + shdr->sh_offset); - tablesz = shdr->sh_size; + sh_offset = elf_shdr_get_sh_offset(class, shdr); + table = (struct resource_table *)(elf_data + sh_offset); + tablesz = elf_shdr_get_sh_size(class, shdr); /* * Create a copy of the resource table. When a virtio device starts @@ -317,13 +380,24 @@ EXPORT_SYMBOL(rproc_elf_load_rsc_table); struct resource_table *rproc_elf_find_loaded_rsc_table(struct rproc *rproc, const struct firmware *fw) { - struct elf32_hdr *ehdr = (struct elf32_hdr *)fw->data; - struct elf32_shdr *shdr; + const void *shdr; + u64 sh_addr, sh_size; + u8 class = fw_elf_get_class(fw); + struct device *dev = &rproc->dev; - shdr = find_table(&rproc->dev, ehdr, fw->size); + shdr = find_table(&rproc->dev, fw); if (!shdr) return NULL; - return rproc_da_to_va(rproc, shdr->sh_addr, shdr->sh_size); + sh_addr = elf_shdr_get_sh_addr(class, shdr); + sh_size = elf_shdr_get_sh_size(class, shdr); + + if (!rproc_u64_fit_in_size_t(sh_size)) { + dev_err(dev, "size (%llx) does not fit in size_t type\n", + sh_size); + return NULL; + } + + return rproc_da_to_va(rproc, sh_addr, sh_size); } EXPORT_SYMBOL(rproc_elf_find_loaded_rsc_table); diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h index 85903f5fea5b..b389dc79da81 100644 --- a/drivers/remoteproc/remoteproc_internal.h +++ b/drivers/remoteproc/remoteproc_internal.h @@ -55,6 +55,7 @@ phys_addr_t rproc_va_to_pa(void *cpu_addr); int rproc_trigger_recovery(struct rproc *rproc); int rproc_elf32_sanity_check(struct rproc *rproc, const struct firmware *fw); +int rproc_elf_sanity_check(struct rproc *rproc, const struct firmware *fw); u64 rproc_elf_get_boot_addr(struct rproc *rproc, const struct firmware *fw); int rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw); int rproc_elf_load_rsc_table(struct rproc *rproc, const struct firmware *fw); @@ -119,4 +120,13 @@ struct resource_table *rproc_find_loaded_rsc_table(struct rproc *rproc, return NULL; } +static inline +bool rproc_u64_fit_in_size_t(u64 val) +{ + if (sizeof(size_t) == sizeof(u64)) + return true; + + return (val <= (size_t) -1); +} + #endif /* REMOTEPROC_INTERNAL_H */ |