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linux-user/elfload: Move PT_INTERP detection to first loop

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For BTI, we need to know if the executable is static or dynamic,
which means looking for PT_INTERP earlier.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20201021173749.111103-8-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2020-10-21 10:37:44 -07:00 committed by Peter Maydell
parent 4d9d535a8a
commit 8a1a5274c9
1 changed files with 31 additions and 29 deletions
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60
linux-user/elfload.c
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@ -2421,8 +2421,10 @@ static void load_elf_image(const char *image_name, int image_fd,
mmap_lock();
/* Find the maximum size of the image and allocate an appropriate
amount of memory to handle that. */
/*
* Find the maximum size of the image and allocate an appropriate
* amount of memory to handle that. Locate the interpreter, if any.
*/
loaddr = -1, hiaddr = 0;
info->alignment = 0;
for (i = 0; i < ehdr->e_phnum; ++i) {
@ -2438,6 +2440,33 @@ static void load_elf_image(const char *image_name, int image_fd,
}
++info->nsegs;
info->alignment |= eppnt->p_align;
} else if (eppnt->p_type == PT_INTERP && pinterp_name) {
g_autofree char *interp_name = NULL;
if (*pinterp_name) {
errmsg = "Multiple PT_INTERP entries";
goto exit_errmsg;
}
interp_name = g_malloc(eppnt->p_filesz);
if (!interp_name) {
goto exit_perror;
}
if (eppnt->p_offset + eppnt->p_filesz <= BPRM_BUF_SIZE) {
memcpy(interp_name, bprm_buf + eppnt->p_offset,
eppnt->p_filesz);
} else {
retval = pread(image_fd, interp_name, eppnt->p_filesz,
eppnt->p_offset);
if (retval != eppnt->p_filesz) {
goto exit_perror;
}
}
if (interp_name[eppnt->p_filesz - 1] != 0) {
errmsg = "Invalid PT_INTERP entry";
goto exit_errmsg;
}
*pinterp_name = g_steal_pointer(&interp_name);
}
}
@ -2590,33 +2619,6 @@ static void load_elf_image(const char *image_name, int image_fd,
if (vaddr_em > info->brk) {
info->brk = vaddr_em;
}
} else if (eppnt->p_type == PT_INTERP && pinterp_name) {
g_autofree char *interp_name = NULL;
if (*pinterp_name) {
errmsg = "Multiple PT_INTERP entries";
goto exit_errmsg;
}
interp_name = g_malloc(eppnt->p_filesz);
if (!interp_name) {
goto exit_perror;
}
if (eppnt->p_offset + eppnt->p_filesz <= BPRM_BUF_SIZE) {
memcpy(interp_name, bprm_buf + eppnt->p_offset,
eppnt->p_filesz);
} else {
retval = pread(image_fd, interp_name, eppnt->p_filesz,
eppnt->p_offset);
if (retval != eppnt->p_filesz) {
goto exit_perror;
}
}
if (interp_name[eppnt->p_filesz - 1] != 0) {
errmsg = "Invalid PT_INTERP entry";
goto exit_errmsg;
}
*pinterp_name = g_steal_pointer(&interp_name);
#ifdef TARGET_MIPS
} else if (eppnt->p_type == PT_MIPS_ABIFLAGS) {
Mips_elf_abiflags_v0 abiflags;