From 08e9a60a1ad34425a849c37611e55dd9fb4d3618 Mon Sep 17 00:00:00 2001 From: Joe Simmons-Talbott Date: Mon, 2 Oct 2023 12:55:27 +0000 Subject: mips: dl-machine-reject-phdr: Get rid of alloca. Read directly into the mips_abiflags struct rather than reading the entire segment and using alloca when the passed buffer is not big enough. Checked with build-many-glibcs.py on mips-linux-gnu Tested-by: Ying Huang Reviewed-by: Adhemerval Zanella --- sysdeps/mips/dl-machine-reject-phdr.h | 26 ++++++++++---------------- 1 file changed, 10 insertions(+), 16 deletions(-) (limited to 'sysdeps') diff --git a/sysdeps/mips/dl-machine-reject-phdr.h b/sysdeps/mips/dl-machine-reject-phdr.h index 104b590661..b784697fc1 100644 --- a/sysdeps/mips/dl-machine-reject-phdr.h +++ b/sysdeps/mips/dl-machine-reject-phdr.h @@ -161,7 +161,7 @@ elf_machine_reject_phdr_p (const ElfW(Phdr) *phdr, unsigned int phnum, Lmid_t nsid; int in_abi = -1; struct abi_req in_req; - Elf_MIPS_ABIFlags_v0 *mips_abiflags = NULL; + Elf_MIPS_ABIFlags_v0 mips_abiflags; bool perfect_match = false; #if _MIPS_SIM == _ABIO32 unsigned int cur_mode = -1; @@ -176,25 +176,19 @@ elf_machine_reject_phdr_p (const ElfW(Phdr) *phdr, unsigned int phnum, /* Read the attributes section. */ if (ph != NULL) { - ElfW(Addr) size = ph->p_filesz; + ElfW(Addr) size = sizeof (Elf_MIPS_ABIFlags_v0); - if (ph->p_offset + size <= len) - mips_abiflags = (Elf_MIPS_ABIFlags_v0 *) (buf + ph->p_offset); - else - { - mips_abiflags = alloca (size); - __lseek (fd, ph->p_offset, SEEK_SET); - if (__libc_read (fd, (void *) mips_abiflags, size) != size) - REJECT (" unable to read PT_MIPS_ABIFLAGS\n"); - } - - if (size < sizeof (Elf_MIPS_ABIFlags_v0)) + if (ph->p_filesz < size) REJECT (" contains malformed PT_MIPS_ABIFLAGS\n"); - if (__glibc_unlikely (mips_abiflags->flags2 != 0)) - REJECT (" unknown MIPS.abiflags flags2: %u\n", mips_abiflags->flags2); + __lseek (fd, ph->p_offset, SEEK_SET); + if (__libc_read (fd, (void *) &mips_abiflags, size) != size) + REJECT (" unable to read PT_MIPS_ABIFLAGS\n"); + + if (__glibc_unlikely (mips_abiflags.flags2 != 0)) + REJECT (" unknown MIPS.abiflags flags2: %u\n", mips_abiflags.flags2); - in_abi = mips_abiflags->fp_abi; + in_abi = mips_abiflags.fp_abi; } /* ANY is compatible with anything. */ -- cgit 1.4.1