Retire linprocfs_doargv(). Instead use new functions, proc_getargv()
and proc_getenvv(), which were implemented using linprocfs_doargv() as a reference. Suggested by: kib Reviewed by: kib Approved by: des (linprocfs maintainer) MFC after: 2 weeks
This commit is contained in:
Mikolaj Golub
parent
66c6108d5d
commit
7a837e17ba
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=227836
@ -919,150 +919,6 @@ linprocfs_doprocroot(PFS_FILL_ARGS)
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return (0);
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}
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#define MAX_ARGV_STR 512 /* Max number of argv-like strings */
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#define UIO_CHUNK_SZ 256 /* Max chunk size (bytes) for uiomove */
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static int
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linprocfs_doargv(struct thread *td, struct proc *p, struct sbuf *sb,
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void (*resolver)(const struct ps_strings, u_long *, int *))
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{
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struct iovec iov;
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struct uio tmp_uio;
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struct ps_strings pss;
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int ret, i, n_elements, elm_len;
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u_long addr, pbegin;
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char **env_vector, *envp;
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char env_string[UIO_CHUNK_SZ];
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#ifdef COMPAT_FREEBSD32
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struct freebsd32_ps_strings pss32;
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uint32_t *env_vector32;
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#endif
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#define UIO_HELPER(uio, iov, base, len, cnt, offset, sz, flg, rw, td) \
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do { \
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iov.iov_base = (caddr_t)(base); \
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iov.iov_len = (len); \
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uio.uio_iov = &(iov); \
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uio.uio_iovcnt = (cnt); \
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uio.uio_offset = (off_t)(offset); \
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uio.uio_resid = (sz); \
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uio.uio_segflg = (flg); \
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uio.uio_rw = (rw); \
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uio.uio_td = (td); \
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} while (0)
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env_vector = malloc(sizeof(char *) * MAX_ARGV_STR, M_TEMP, M_WAITOK);
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#ifdef COMPAT_FREEBSD32
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env_vector32 = NULL;
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if (SV_PROC_FLAG(p, SV_ILP32) != 0) {
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env_vector32 = malloc(sizeof(*env_vector32) * MAX_ARGV_STR,
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M_TEMP, M_WAITOK);
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elm_len = sizeof(int32_t);
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envp = (char *)env_vector32;
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UIO_HELPER(tmp_uio, iov, &pss32, sizeof(pss32), 1,
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(off_t)(p->p_sysent->sv_psstrings),
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sizeof(pss32), UIO_SYSSPACE, UIO_READ, td);
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ret = proc_rwmem(p, &tmp_uio);
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if (ret != 0)
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goto done;
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pss.ps_argvstr = PTRIN(pss32.ps_argvstr);
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pss.ps_nargvstr = pss32.ps_nargvstr;
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pss.ps_envstr = PTRIN(pss32.ps_envstr);
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pss.ps_nenvstr = pss32.ps_nenvstr;
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} else {
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#endif
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elm_len = sizeof(char *);
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envp = (char *)env_vector;
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UIO_HELPER(tmp_uio, iov, &pss, sizeof(pss), 1,
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(off_t)(p->p_sysent->sv_psstrings),
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sizeof(pss), UIO_SYSSPACE, UIO_READ, td);
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ret = proc_rwmem(p, &tmp_uio);
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if (ret != 0)
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goto done;
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#ifdef COMPAT_FREEBSD32
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}
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#endif
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/* Get the array address and the number of elements */
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resolver(pss, &addr, &n_elements);
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/* Consistent with lib/libkvm/kvm_proc.c */
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if (n_elements > MAX_ARGV_STR) {
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ret = E2BIG;
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goto done;
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}
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UIO_HELPER(tmp_uio, iov, envp, n_elements * elm_len, 1,
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(vm_offset_t)(addr), iov.iov_len, UIO_SYSSPACE, UIO_READ, td);
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ret = proc_rwmem(p, &tmp_uio);
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if (ret != 0)
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goto done;
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#ifdef COMPAT_FREEBSD32
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if (env_vector32 != NULL) {
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for (i = 0; i < n_elements; i++)
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env_vector[i] = PTRIN(env_vector32[i]);
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}
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#endif
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/* Now we can iterate through the list of strings */
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for (i = 0; i < n_elements; i++) {
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pbegin = (vm_offset_t)env_vector[i];
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for (;;) {
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UIO_HELPER(tmp_uio, iov, env_string, sizeof(env_string),
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1, pbegin, iov.iov_len, UIO_SYSSPACE, UIO_READ, td);
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ret = proc_rwmem(p, &tmp_uio);
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if (ret != 0)
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goto done;
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if (!strvalid(env_string, UIO_CHUNK_SZ)) {
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/*
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* We didn't find the end of the string.
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* Add the string to the buffer and move
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* the pointer. But do not allow strings
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* of unlimited length.
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*/
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sbuf_bcat(sb, env_string, UIO_CHUNK_SZ);
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if (sbuf_len(sb) >= ARG_MAX) {
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ret = E2BIG;
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goto done;
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}
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pbegin += UIO_CHUNK_SZ;
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} else {
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sbuf_cat(sb, env_string);
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break;
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}
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}
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sbuf_bcat(sb, "", 1);
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}
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#undef UIO_HELPER
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done:
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free(env_vector, M_TEMP);
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#ifdef COMPAT_FREEBSD32
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free(env_vector32, M_TEMP);
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#endif
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return (ret);
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}
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static void
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ps_string_argv(const struct ps_strings ps, u_long *addr, int *n)
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{
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*addr = (u_long) ps.ps_argvstr;
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*n = ps.ps_nargvstr;
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}
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static void
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ps_string_env(const struct ps_strings ps, u_long *addr, int *n)
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{
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*addr = (u_long) ps.ps_envstr;
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*n = ps.ps_nenvstr;
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}
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/*
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* Filler function for proc/pid/cmdline
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*/
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@ -1090,9 +946,15 @@ linprocfs_doproccmdline(PFS_FILL_ARGS)
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PROC_UNLOCK(p);
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return (0);
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}
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if ((p->p_flag & P_SYSTEM) != 0) {
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PROC_UNLOCK(p);
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return (0);
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}
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PROC_UNLOCK(p);
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ret = linprocfs_doargv(td, p, sb, ps_string_argv);
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ret = proc_getargv(td, p, sb, ARG_MAX);
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return (ret);
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}
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@ -1118,9 +980,15 @@ linprocfs_doprocenviron(PFS_FILL_ARGS)
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PROC_UNLOCK(p);
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return (0);
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}
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if ((p->p_flag & P_SYSTEM) != 0) {
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PROC_UNLOCK(p);
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return (0);
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}
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PROC_UNLOCK(p);
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ret = linprocfs_doargv(td, p, sb, ps_string_env);
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ret = proc_getenvv(td, p, sb, ARG_MAX);
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return (ret);
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}
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