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elf:use elf symbol to parse attribute

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Parse application attributes (stacksize, priority, and uid/gid/mode under
CONFIG_SCHED_USER_IDENTITY) from absolute symbols (nx_stacksize,
nx_priority, nx_uid, nx_gid, nx_mode) embedded in the ELF at link time,
falling back to defaults when the symbols are absent.

Signed-off-by: anjiahao <anjiahao@xiaomi.com>
This commit is contained in:
anjiahao 2026-07-15 16:10:08 +08:00 • committed by Alan C. Assis
parent c8b71df614
commit 0178ceab19
2 changed files with 79 additions and 2 deletions
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53
binfmt/elf.c
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@ -98,6 +98,7 @@ static int elf_loadbinary(FAR struct binary_s *binp,
int nexports)
{
struct mod_loadinfo_s loadinfo;
Elf_Sym sym;
int ret;
binfo("Loading file: %s\n", filename);
@ -173,7 +174,57 @@ static int elf_loadbinary(FAR struct binary_s *binp,
/* Return the load information */
binp->stacksize = CONFIG_ELF_STACKSIZE;
ret = libelf_findsymbol(&loadinfo, "nx_stacksize", &sym);
if (ret == 0)
{
binp->stacksize = sym.st_value;
}
else
{
binp->stacksize = CONFIG_ELF_STACKSIZE;
}
ret = libelf_findsymbol(&loadinfo, "nx_priority", &sym);
if (ret == 0)
{
binp->priority = sym.st_value;
}
else
{
binp->priority = SCHED_PRIORITY_DEFAULT;
}
#ifdef CONFIG_SCHED_USER_IDENTITY
ret = libelf_findsymbol(&loadinfo, "nx_uid", &sym);
if (ret == 0)
{
binp->uid = sym.st_value;
}
else
{
binp->uid = 0;
}
ret = libelf_findsymbol(&loadinfo, "nx_gid", &sym);
if (ret == 0)
{
binp->gid = sym.st_value;
}
else
{
binp->gid = 0;
}
ret = libelf_findsymbol(&loadinfo, "nx_mode", &sym);
if (ret == 0)
{
binp->mode = sym.st_value;
}
else
{
binp->mode = 0;
}
#endif
/* Add the ELF allocation to the alloc[] only if there is no address
* environment. If there is an address environment, it will automatically